Dermatomes: A dermatome is an area of skin which is chiefly supplied by a single spinal nerve. There are 8 cervical nerves (C1 denoting an. Free flashcards to help memorize facts about Skin surfaces and Muscles weakness. Other activities to help include hangman, crossword, word scramble, games. An adult myotome is defined as ‘a group of muscles innervated by a They are therefore comprised of multiple myotomes. Dermatomes.

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Free Anatomy Flashcards about Dermatomes/Myotomes

A myotome is the group of muscles which have a single spinal nerve innervates. Most muscles in both upper and lower limbs are innervated from more than one spinal nerve root. The C2 to C4 nerves innervate the regions in the skin of the neck. They start with two nerve roots: The main difference between dermatome and myotome is the structure and the function of each region during coordination of functions. Retrieved from ” https: Myotome is responsible for the coordination of voluntary muscular movements.

The C5 to T1 nerves innervate the arms. In humans myotome testing can be an integral part of neurological examination as each nerve root coming from the spinal cord supplies a specific group of muscles.

When an encroachment occurs to a spinal nerve, the corresponding dermatome may exhibit the symptoms.

The list below details nerve roots and the approximate area of skin that they provide innervation to:. The revenue we generate from these adverts allows us to keep the website free.

By using this site, you aand to the Terms of Use and Privacy Policy. If you imagine the human body as a map, each dermatome represents the sensory innervation of a particular spinal nerve. Previous Electroconvulsive therapy ECT counselling. They are clinically useful as they can determine if damage has occurred to the spinal cord, and at which level the damage has occurred.


Both dermatomes and myotomes play a significant role in the coordination of functions of the body by communicating with the nervous system. Firstly, the dermaotmes uses cotton wool to test for light touch sensation, which corresponds to the different dermatomes. 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 dermatomed, which is the precursor of the ribs and vertebral column.

By visiting this site you agree to the foregoing terms and conditions. Embryology Dermatomes and myotomes both arise from somites, which are divisions of the body of an embryo. Dermatome and myotome are two areas of the body that are served by spinal nerves. 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.

Each muscle in the body is supplied by one or more levels or segments of the spinal cord and by their corresponding spinal nerves. The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.

This information is intended for medical education, and does not create any doctor-patient relationship, and should not be used as a substitute for professional diagnosis and treatment.


Both dermatome and myotome are innervated with a single spinal nerve. Dermatome and myotome are two types of regions of the body innervated by a single root of spinal nerves. It provides us with some basic information as to what page a user is currently viewing and location country.

Sign up Log in. The L3 to S1 nerves innervate the legs.

This page was last edited on 4 Novemberat This site uses functional cookies and external scripts to improve your experience. Somites are paired structures which run cephalocaudally along the head to toe axis of the body. C8 — The small muscles of the hand. These settings will only apply to the browser and device you are currently using.

In vertebrate embryonic developmenta myotome is the part of a somite that develops into the muscles.

The remaining sacral and coccygeal nerves innervate the groin. Views Read Edit View history.

Dermatomes and Myotomes | Anatomy

C6 — The biceps flexion of the arm in the elbow joint. Compare left to right, by asking the patient if it feels the same on both sides. The dermatomes of the spinal nerves are shown in figure 1. Your choices will not impact your visit. Myotome distributions of the upper and lower extremity are as follows; [5] [6]. The brachial plexus is a nerve network formed from the C5 to T1 spinal nerves.