A skin region supplied by a peripheral nerve is called the cutaneous innervation of that nerve (Fig. Nerve injury should be considered when a . Description. Brachial plexus tutorial: https://www.youtube.com/watch?v=RLJ8a.This video tutorial compares and contrasts brachial plexus root injuries with peripheral ne. Dermatome and myotome are two types of regions of the body innervated by a single root of spinal nerves. Dermatome: Some dermatomes consists of overlapping regions innervated by more than one spinal nerve. The peripheral nervous system is divided into somatic and autonomic components. Each nerve root has an associated dermatome, and each dermatome is supplied by many branches of that single nerve root. function distribution of Peripheral nerves. %%EOF How does a doctor know the difference between diabetic nerve pain and peripheral arterial disease. Each peripheral nerve is made up of fibers deriving from the different nerve roots. Upper extremity sensory complaints include a differential diagnosis of nerve root entrapment or irritation vs. peripheral nerve entrapment. The area of skin supplied by any one spinal nerve, through both its rami constitutes a dermatome and, typically, the dermatome extends around the body from the anterior to the posterior median line (embryologically based). This is the first comprehensive text-atlas that shows how to use ultrasound technology and nerve stimulation techniques to guide regional blockade in children. I dont understand why? This condition can affect people of any age. This nerve is derived from three spinal nerve roots: C5, C6, and C7. The knowledge about the distribution of both dermatome and myotome is important in accessing the spinal lesions while ascertaining the levels of spinal cord injury. A myotome refers to a group of muscles innervated by the nerves of a single spinal root. Weakness, sensory changes below the level of the lesion and hyper-reflexia • L'Hermitte's sign cervical cord • Electrical pulsation through body with neck extension or flexion • Radiculopathy follows distinct myotomal and dermatomal pattern, hypo-reflexia What is the Difference Between Tuberosity and... What is the Difference Between Narrative and Lyric Poetry, What is the Difference Between Ruffles and Gathers, What is the Difference Between High Tide and Low Tide, What is the Difference Between Earthenware and Stoneware, What is the Difference Between Formal and Informal Fallacy, What is the Difference Between Gelato and Ice Cream and Sorbet. Becoming familiar with dermatomes, cutaneous innervation, and myotomes will help practitioners better understand nerve injury symptoms. It is important to bear in mind that the dermatomes of the head are supplied by branches V1, V2 and V3 of the trigeminal nerve. The remaining sacral and coccygeal nerves innervate the groin. In our experience, the axial plane is the most useful for assessment of peripheral nerves of the upper extremity, since all these nerves are lon-gitudinally oriented within the limb. Nerve root C7 is responsible for wrist flexion and finger extension. The somatic nervous system includes the sensory and motor nerves that innervate the limbs and body wall. Radiculopathy. What is Dermatomes? Symptoms of the condition can include pain, weakness, and numbness in the hands, feet, and throughout the body. Peripheral Neuropathy Defined. The Babinski test ("plantars") can be abnormal in the present of upper motor neuron damage. Found insideKnowledge of the anatomy of the sensory half of the nervous system can help us define the abnormalities and localize them . ... vs. unilateral ; dermatomal , multiple dermatomal ( either contiguous or not ) ; root vs. peripheral nerve . Dermatomes chart provides an easy to understand map of the approximate areas of skin supplied by nerves from a single spinal root. They are stacked on top of each other. Definition: These are the regions where single nerve roots supply distinct and non-overlapping areas of skin. JAOA 105(2);2005:71-83 EDX TESTING Neuropathic Focal Neuropathies Polyneuropathies Motor neuron conditions Myopathic Muscular Dystrophy • Motor (myotome vs peripheral nerve pattern) • Sensory (dermatome vs peripheral nerve pattern) • Reflexes Kozin S, Kothari M. Evaluating the patient with peripheral nervous system complaints. With access to the full text and surgical videos online at expertconsult.com, you’ll have the dynamic, visual guidance you need to manage injuries to the brachial plexus. Myotome: Some myotomes are innervated by more than one spinal nerve. A list of common myotomes and their nerve roots are described in table 1. If you want to strictly talk about cutaneous sensations, you can talk about dermatomes (C5, c6, etc). Both dermatome and myotome are innervated with a single spinal nerve. Anywhere in the lower limb, fixed in location, commonly in the buttock or proximal thigh. between the peripheral nerves of the limbs (upper and lower extremities) is far less extensive (see the following image). The size of autonomous zone for a . Each dermatome is associated with a specific nerve root. A practical manual on the treatment of pelvic pain, focusing on the many gynecological and non-gynecological causes of the condition. Quickly memorize the terms, phrases and much more. Both upper and lower limb blocks are included. The book is spiral bound at the top and printed on heavy, laminated paper to allow use in the operating room. In this this article, we shall look at the embryonic origins of dermatomes, and their clinical uses. 425 0 obj <> endobj Cram.com makes it easy to get the grade you want! . More than one level of involvement was demonstrated on imaging in 41 (24%) cases. You have 31 spinal nerves and 30 dermatomes. Both myotomes and dermatomes come from somites, which are parts of the body of an embryo. Dermatome refers to a region of the skin while myotome refers to a group of muscles. The comparable structure of the CNS is called a 'tract'. Definitions overlap: A dermatome is an area of skin supplied by sensory neurons that arise from a single spinal nerve ganglion (from a single dorsal root). Both dermatomes and myotomes play a significant role in the coordination of functions of the body by communicating with the nervous system. There are 8 cervical nerves (note C1 has with no dermatome), 12 thoracic nerves, 5 lumbar nerves and 5 sacral nerves. Dermatomes. Found inside – Page 485Are you exposed to any chemicals which might give rise to neuropathy or myopathy ? ... changes ( decreased , increased , or asymmetric ) • Sensory disturbances ( nerve root dermatome vs. peripheral nerve dermatome distribution ) . The nerve roots exit bilaterally from each vertebra; Sensory nerve. What is the difference between dermatome and the center of the tendon jerk? Neuro seems to be my weak spot and I'm struggling to memorise dermatomes, peripheral nerve zones and myotomes etc. A dermatome is an area of skin that is mainly supplied by a single spinal nerve. The knowledge about the distribution of both dermatome and myotome is important in accessing the spinal lesions while ascertaining the levels of spinal cord injury. Peripheral vs Central Lesions. The C2 to C4 nerves innervate the regions in the skin of the neck. By their nature the "autonomous zones" represent only a small portion of any dermatome and only a few nerve roots have such autonomous zones. It is specific for feeling. The understanding of the myotome is also important in accessing the spinal lesions while ascertaining the levels of spinal cord injury. On that account, the skin is a collection of dermatomes. Unlike epidural and spinal blocks, peripheral nerve blocks are not generally chosen based on dermatomes, but osteotomes (or myotomes) The distribution and depth of the block depends on which nerves are being targeted and how much LA is used If pain is occurring, consider a "patchy" or failed block --the patchy block can sometimes be saved “Branches of Brachial plexus” By Madhero88 – Own work (CC BY-SA 3.0) via Commons Wikimedia, Lakna, a graduate in Molecular Biology & Biochemistry, is a Molecular Biologist and has a broad and keen interest in the discovery of nature related things, What are the Similarities Between Dermatome and Myotome, What is the Difference Between Dermatome and Myotome. Education 3 hours ago Radiculopathy vs. Neuropathy Symptoms. A dermatome is an area of the skin which is specifically supplied by a single spinal nerve. C5 - deltoids, anterior arm (facing forward) down to the base of the thumb. Dermatome and myotome are two areas of the body that are served by spinal nerves. This serves to map the area of involvement, with a view toward categorizing the abnormality into a specifically defined syndrome (i.e., dermatomal, nerve, nerve root, or glove and stocking pattern). Dermatomes are a bit like highways through which information about sensations in your skin . As mentioned, the key difference between spinal radiculopathy vs. peripheral neuropathy is the location and type of nerve affected. Spinal Nerve Pain Found inside – Page 7The primitive metamere (segmentation) remains only in the thoracic region. It completely changes everywhere else, particularly in the extremities. Dermatomes and myotomes overlap each other. The nerve trunks and anastomoses form a ... A skin region supplied by a peripheral nerve is called the cutaneous innervation of that nerve (Fig. A dermatome is an area of skin supplied by a single spinal nerve. Dermatomes are areas of skin that are connected to a single spinal nerve. The T2 to L2 nerves innervate the chest and abdomen. Video chat with a U.S. board-certified doctor 24/7 in less than one minute for common issues such as: colds and coughs, stomach symptoms, bladder infections, rashes, and more. Injury is an increasingly significant health problem throughout the world, accounting for 16 per cent of the global burden of disease. When an encroachment occurs to a spinal nerve, the corresponding dermatome may exhibit the symptoms. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A peripheral nerve field refers to an area of skin innervated by a single nerve. Sensory nerve fibers in the peripheral nerves are the peripheral axonal process of neurons in the dorsal root ganglion. C6 - anterior arm as well as the radial side of the hand. Dermatome vs. Myotome . At each vertebra a nerve root exits from the spinal cord. The exact area that each dermatome covers can be different from person to person. A practical, comprehensive guide to the special needs of infants and neonates undergoing anesthesia. The dermatomes of the thorax and abdomen are evenly spaced segments. This volume provides a greatly detailed overview of the anatomy of the peripheral and cranial nerves as well as comprehensive details of imaging modalities and diagnostic tests. Found inside... below a certain level ; proximal vs. distal ; symmetric vs. unilateral ; dermatomal , multiple dermatomal ( either contiguous or not ) ; root vs. peripheral nerve . Pain and sensory loss in a single dermatome indicates peripheral ... Answer (1 of 2): A dermatome is the anatomical area supplied by the nerves coming out of one particular area of the spinal cord and is labelled as such. Dermatomes are zones of skin whose sensory input is "assigned," so to speak, to individual spinal nerves. Peripheral nerve injury of the upper extremity commonly occurs in patients who participate in recreational (e.g., sports) and occupational activities. Most muscles in both upper and lower limbs are innervated from more than one spinal nerve root. Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. There is no easy way of remembering all the nerve pathways, however, when learning this . It innervates the chest, shoulder, arm, and the hand. If you imagine the human body as a map, each dermatome represents the area of skin supplied with sensation by a specific nerve root. Dermatomal distribution of peripheral nerve sensation ()Non-dermatomal loss of sensation can be either a CNS or PNS issue.A nerve plexus or individual nerves can be damaged leading to non-dermatomal losses (PNS implicated), or entire regions of the body can lose sensation due to central lesions (CNS can be implicated).CNS VS. Whereas radiculopathy deals with damage to the nerves associated with the spine, peripheral neuropathy is damage to the secondary nerves located at. The spinal nerves run longitudinally along the arms and legs. Is there a difference between peripheral arterial disease and peripheral venous disease? The main difference between dermatome and myotome is the structure and the function of each region during coordination of functions. For starters, remember that both peripheral nerve lesions and radiculopathy are lower motor neuron lesions, so they can both present with corresponding weakness and hyporeflexia. Dermatomes are similar; however, a dermatome only specifies the area served by a spinal nerve. 8 cervical nerves, 12 thoracic nerves, 5 lumbar nerves, 5 sacral nerves,1 coccygeal nerve. The L1 and L2 dermatomes can be found in sites adjacent to S2 and S3 dermatomes because of the intervening segments migrating into more distal parts of the lower limbs. They start with two nerve roots: the ventral nerve root (anterior), innervating the motor functions and the dorsal (posterior) nerve root, innervating the sensory functions. It can feel like an expanding pressure into the lower limb, but remains in location once . Found inside – Page 338These tests can also be used to differentiate between nerve root dysfunction and injury to peripheral nerves. ... Also reports difficulty Objective: Dermatomes: ↓d sensation at L C8 dermatome vs ®; nl sensation (® = L) at C6, C7, T1, ... endstream endobj startxref They are of great diagnostic importance, as they allow the clinician to determine whether there is damage to the spinal cord, and to estimate the extent of a spinal injury if there is one present. The reflexology charts with their descriptive illustrations provide you with a useful aid for your treatments. Additionally you can use the result sheets for documentation of your experiences Joy and success with reflexology ! Ewald Kliegel These somites come in pairs which run from head to toe on the body. 1. Although nerve conduction studies (NCS) and electromyography (EMG) are standard tests in the evaluation of focal peripheral neuropathies (), newer techniques, including peripheral nerve ultrasound and MRI neurography, have started to gain acceptance ().Similarly, evaluation for radiculopathy often requires NCS/EMG as well as MRI of the cervical or lumbosacral spine, particularly . Below are a couple pictures of the peripheral nerve layouts and dermatomal patterns that I will reference throughout this post. Found inside – Page 115Common symptoms of musculotendinous pathology, myofascial trigger point activity, cervical radiculopathy, and peripheral neuropathy Figure 15.2 Dermatomes of the upper limb: left, anterior; right, posterior. There is minimal overlap ... “Dermatomes Anatomy.” Overview, Gross Anatomy, Natural Variants, 13 Oct. 2017, Available here.2. The term dermatome suggests radiculopathy and indicates the entire area of skin innervated by a spinal root and not a peripheral nerve. Therefore, they form a pattern of a trunk. Doctors use dermatomes to help diagnose diseases and conditions. The dermatomes of the spinal nerves are shown in figure 1. Think of it as two different ways of categorizing the nerve roots. biceps vs brachioradialis (both test C56: tests musculocutaneous nerve vs radial, note biceps jerk) abductor pollicis brevis vs first dorsal interosseous (both T1: test median vs ulnar) abductor pollicis brevis vs flexor pollicis longus (both median but abductor polis brevis supplied after the carpal tunnel) LOWER LIMB. Shiny dry skin on lower legs but not ankles or feet, calf pain I'm walking only if I'm carrying heavy things. Peripheral neuropathy is a condition that results from damage to the peripheral nerves, which send pain signals and control movement throughout the body. keepitpositive. A dermatome is an area of skin supplied by fibers from a single nerve root. peripheral nerves and the tissues that surround them. A dermatome is an area of skin innervated by a single spinal nerve. As an example, the flexion of the elbow is innervated by the musculocutaneous nerve. These nerves are mainly afferent nerve fibres coming from a single dorsal root of the spinal nerve. Lesions of the plexus are asymmetric . A dermatome is an area of skin supplied by fibers from a single nerve root. A dermatome is an area of skin supplied by fibers from a single nerve root. Dermatome. Common fibular (peroneal) nerve (L4,L5,S1,S2) innervates muscles of the anterolateral leg (lower leg) And that's that! All spinal nerves occur as pairs (left and right). Downward flexion of the foot at the ankle. C8 versus Ulnar nerve- Sensory • C8 - Dermatome based • Sensation to entire ring finger affected (and pinky finger) - Total sensory loss virtually never occurs 10. Peripheral nerves. Get prescriptions or refills through a video chat, if the doctor feels the prescriptions are medically appropriate. For potential or actual medical emergencies, immediately call 911 or your local emergency service. Main Difference - Dermatome vs Myotome. Each spinal nerve is composed of a dermatome, except for the first cervical nerve. Each of these nerves is associated with a dermatome except for the C1 spinal nerve in your neck. Based on the dermatome info, impinging a given spinal root should make its dermatome and only its dermatome numb. h�b```f``��������A��b�@�q���a�Wf5a���K�E���@J��f\g l�$��t$����n���[�P������P�P&�B5 h��� ��B S��������2:3����������:_���URGJ20���z� HK10�����] ��X;��1(00~���c�0 �:1� How long after quitting smoking cigarettes will i notice a difference in peripheral nerves? Educational text answers on HealthTap are not intended for individual diagnosis, treatment or prescription. There are 31 spinal nerve pairs, leaving the spinal cord in humans. to peripheral nerves, the next step is to find the etiology and . 1. Dermatomes of the extremities. The use of T1-weighted spin-echo (SE) sequences allows depiction of fine anatomic detail, including the Common peroneal nerve dysfunction is a type of peripheral neuropathy (damage to nerves outside the brain or spinal cord). Introduction. Dermatomes vs peripheral cutaneous nerves. Dermatomes versus Cutaneous Fields Each spinal nerve contains sensory neurons that serve a specific, predictable segment of the body. Knowledge of dermatomes is important for localizing peripheral nerve root lesions and distinguishing them from peripheral nerve lesions. Ideal for students of neuroscience and neuroanatomy, the new edition of Netter's Atlas of Neuroscience combines the didactic well-loved illustrations of Dr. Frank Netter with succinct text and clinical points, providing a highly visual, ... The reflexology charts with their descriptive illustrations provide you with a useful aid for your treatments. Additionally you can use the result sheets for documentation of your experiences Joy and success with reflexology ! Ewald Kliegel What you describe is not a dermatome but rather a "peripheral nerve field", "peripheral nerve distribution", or "cutaneous nerve distribution". For example, the axillary nerve (C5,6) innervates the skin of the lateral shoulder and upper arm (regimental badge area) via its superior lateral cutaneous . The data shown in this book will be surely helpful for traumatologists, orthopaedists, spinal surgeons, neurosurgeons, plastic surgeons and for all those dealing with intraspinal variations of nerve roots. Each dermatome is associated with a specific nerve root. What you may notice from the two images below is how the dermatomal pattern of a spinal level differs from a peripheral cutaneous nerve. Here are some general principles you could follow in such case: 1. 31 spinal nerves can be divided into 8 cervical nerves, 12 thoracic nerves, 5 lumbar nerves, 5 sacral nerves, and 1 coccygeal nerves. Found inside – Page 352... MG and GBS antibody testing, lumbar puncture, brain and/or spine imaging, and nerve and/or muscle biopsy. ... clonus, Babinski/Hoffman sign) Peripheral nerve – Can involve motor and/or sensory nerves – Myotome/dermatome vs. Providing a clear and succinct presentation of the underlying anatomy, with directly related applications of the anatomy to clinical examination, the book also provides unique images of anatomical structures of plastinated cadaveric ... Myotomes and dermatomes are mapped, and the location of sensory or motor deficits correspond to specific nerve roots. Dermatomes are areas of skin that receive sensations from sensory nerves exiting the spinal cord. Color Atlas of Reconstructive Microsurgery is an eye opener to all those treating nerve disorder. The book teaches of surgical strategy and the nitty gritties involved in the correction of disorder through microsurgery. Struggling to remember dermatomes, myotomes and peripheral nerve areas for neuro exam - any tips? This is followed by detailed description of the symtomatology, clinical presentation, diagnosis, course, therapy, and prognosis of disorders of the peripheral nervous system caused by these viruses. Dermatomes and Peripheral Nerves - Segmental Innervation of the Skin and the Peripheral Nerve Supply (Anterior and Posterior) #Dermatomes #Peripheral #Nerves #Innervation #Skin #Diagnosis #Neurology ** GrepMed Recommended Text: Hutchison's Clinical Methods - https://amzn.to/2Zc8Gtc. A spinal nerve is a mixed nerve, carrying motor, sensory, and autonomic nerve impulses between the body and the spinal cord. There are 31 spinal nerve pairs, leaving the spinal cord in humans. The motor supply to the upper limb can also be broken down into myotomes (the movements which test individual spinal nerve roots) as well as peripheral nerve functions (Figure 5). What could cause decreased sensation throughout the whole body inc.Face scalp gums genitals , could severe damage to peripheral nerves cause this? They are of great diagnostic importance, as they allow the clinician to determine whether there is damage to the spinal cord, and to estimate the extent of a spinal injury if there is one present. Radiculopathy: involves one spinal nerve root distribution following the patterns of a myotome and/or a dermatome. Each somite comprises a dorsal and a ventral portion; the dorsal portion gives rise to the dermomyotome, which is a precursor of the myotome whereas the ventral portion gives rise to the sclerotome, which is the precursor of the ribs and vertebral column. What are the Similarities Between Dermatome and Myotome     – Outline of Common Features 4. Sensory nerves respond to pain, temperature, touch and pressure. Thus, in the limbs, complete interruption of a single peripheral nerve typically produces changes in sensation that are, indeed, appreciated by a patient. This volume is the proceedings of the symposium. Due to factors which were beyond our control, publication of this volume was significantly delayed. Peripheral- follows peripheral nerve distribution Spinal nerves- follows dermatomal distribution Sensory Tracts Dorsal Column/Medial Lemniscus Light touch Proprioception Vibration- typically first affected in diabetic neuropathy Two-point discrimination . What is a Dermatome      – Definition, Supply of Spinal Nerves, Importance 2. “Dermatoms” By Ralf Stephan (Public Domain) via Commons Wikimedia2. In Segmental Anatomy the correlations between spinal nerves and segments in skin, musclar system and bones are formidably illustrated and written. 16 of these 31 nerves has a specific myotome that controls voluntary muscle movement. Neuropathy: usually involves one peripheral nerve branch entrapped somewhere along its course. This second edition is based on evidence from several WHO updated and published clinical guidelines. It is for use in both inpatient and outpatient care in small hospitals with basic laboratory facilities and essential medicines. A dermatome is a portion of the skin that is supplied by an individual spinal nerve. Found insideNerve dysfunction can involve various anatomic segments of the peripheral nervous system. ... it presents as pain—ranging from a dull constant ache to intermittent sharp lancinating pain within the skin dermatome subserved by that root. There is no easy way of remembering all the nerve pathways, however, when learning this . Use this Table of Contents to go to the next article They are bilaterally-paired blocks of the paraxial mesoderm, occurring along the head-to-tail axis of the embryo during the embryonic development of vertebrates. EXTREMITY), blue - sacral o S3-s5 represent perianal region and not considered part of LE dermatomal list Peripheral o Cutaneous - specific for sensory as function o Motor (femoral, obturator, peroneal, tibial nerve) Important to understand sensory fields clinically being you can cross reference motor weakness with sensory weakness o Saphenous, sural = sensory but not necessarily motor . For these, please consult a doctor (virtually or in person). 457 0 obj <>stream The peroneal nerve is a branch of the sciatic nerve, which supplies movement and sensation to the lower leg, foot and toes. Myotomes is a group of single spinal nerves that originate from groups of muscles. Figure 2: Nerve Innervation of Brachial Plexus. Dermatome refers to an area of skin innervated by the nerves from a single spinal root. Nerve entrapment may or may not cause nerve . Why is it when carry something like a bag of groceries up steps I cant seem to raise my leg to get to the next step,But When I put the bag down I dont have a problem. Tunnel Syndromes: Peripheral Nerve Compression Syndromes provides a quick overview of tunnel syndromes including the definition, anatomy, etiology, clinical signs and symptoms, and treatment. It presents a total of 50 tunnel sy Both anterior and posterior nerve roots combine in order to form a spinal nerve. Pain and temperature nerve fibres are affected by LA. Dermatome: A dermatome refers to an area of skin innervated by the nerves from a single spinal root. As mentioned, the key difference between spinal radiculopathy vs.peripheral neuropathy is the location and type of nerve affected. Dermatomes are areas on the surface of the skin that are control by specific nerve roots from the spinal cord Skin (sensation) is innervated by a single nerve roots called the dermatomes What is myotomes? “Myotomes.” TeachMeAnatomy, 4 Feb. 2017, Available here.3. I dont know why but the infomation doesnt seem to stick around in my head compared to other things I try to memorise. A peripheral nerve field refers to an area of skin innervated by a single nerve. Peripheral nerve injury of the upper extremity commonly occurs in patients who participate in recreational (e.g., sports) and occupational activities. Found inside – Page 141Dermatomes are important particularly for peripheral nerve blockade , and specific cutaneous areas can be targeted based on the dermatomal pattern produced through the terminal nerves in that part of the body ( Figures 11.9 and 11.10 ) ... A dermatome is an area of skin supplied by a single spinal nerve. This is something we all learnt in our training but it is easy to forget. K. Regional anaesthesia is used across specialties within anaesthesia, and is a rapidly growing sub-specialty. This new handbook covers both traditional and ultrasound guided techniques, concentrating on the differences between them. Dermatomes are a bit like highways through which information about sensations in your skin . What you may notice from the two images below is how the dermatomal pattern of a spinal level differs from a peripheral cutaneous nerve. Found inside – Page 45Anteroposterior (a) and lateral (b) radiographic images of an awake patient with intraoperative right C1–C2–C3 stimulating needles 'mapping' dermatomal paresthesia into the distal right C2,C3 (lesser C1) dermatomes (50 Hz at 2.0 V). Autonomous Sensory Zones of Peripheral Nerves. The fibers from that one nerve root make up several peripheral nerves and innervate specific areas of the body. Each spinal nerve starts from a nerve root. The answer is that they don't "match up" in any way that is intuitive without knowing the brachial plexus. A dermatome is defined as 'a strip of skin that is innervated by a single spinal nerve'. C6 dermatome. Each peripheral nerve is made up of fibers deriving from the different nerve roots. A dermatome is defined as 'a strip of skin that is innervated by a single spinal nerve'.
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