5 lumbar dermatomas (L1-L5) that provide sensation of these spinal nerves in the lower extremity (leg, foot, hip, etc.) – “L” refers to the five lumbar vertebrae, the. T L L L L L S S S L L S L S L L S T- L L L L L L L S S L S S S L Por otro lado, estudios de RMN lumbar realizados por otras causas en individuos dermatomas correspondientes a la raíz afectada del nervio ciático: ciatalgia.

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Dermatome (anatomy)

They are numbered according to the corresponding vertebral level from which they emanate. What are other people reading? The anterior and posterior nerve roots are combined on each side to form the spinal nerves as they exit the vertebral canal the bones of the spinal column, or spinal column.

The sensory nerves in the periphery of the body are a type of nerve that transmits signals of sensations for example, symptoms of pain, touch, temperature to the spinal cord from specific areas of our anatomy.

In the extremities the pattern is different. Have you ever wondered why back pain gives rise to tingling sensations in the legs? For example, the nerve fibers on the surface of the skin that covers part of the legs and foot, make up a dermatome that comes from a nerve root of the lower back. Each dermatome is classified according to the spinal nerve that innervates it.

It is important to know how dermatomes work in the clinical setting to locate nerve or spinal cord.


It can be cervical or lumbar depending on dermatomass the pain is. For example, a herniated disc that compresses the nerve root L5 leads to pain and tingling in the lower leg and foot. The latter is the most used. The main ones are viral diseases, radiculopathy and spinal cord injuries.

Types The types of nerves in the anterior and posterior roots are different. There are eight cervical nerves, twelve thoracic nerves, five lumbar and five sacral nerves. It can also cause loss lmbares reduction of the sensory function. The spine is divided into 31 segments, each with a pair right and left of the anterior and posterior nerve roots.

However, the symptoms may not appear across the entire dermatome.

Diagram of lumbaree distribution of the cutaneous nerves of the right upper extremity. Dermatomas should not be confused with myotomas.

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Dermatoma: What It Is, Types and Clinical Significance | Life Persona

However, it is important to mention that dermatomas have been discovered in recent years by clinical observations and are only a guide. When there are spinal cord injuries, the health care provider will look for the affected dermatome.

Articles which use infobox templates with no data rows Commons category link is on Wikidata. Dermatomes are useful for establishing a diagnosis and treatment of different conditions. For example, there are:. Following is a list of spinal nerves and points that are characteristically belonging to the dermatome of each nerve: The 31 segments of the spine on each side give rise to 31 spinal nerves, which are composed of 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coxigeal spinal nerves.


The most common affected regions are L5 and S1, and less commonly C6 and C7. No comments yet Leave Comments Cancel reply.

Dermatome (anatomy) – Wikipedia

There are certain viral diseases that are localized in specific dermatomes, such as Herpes zoster. Along the arms and the legs, the pattern is different: Archived from the original PDF on From Wikipedia, the free encyclopedia. Somatosensory system Neurology Skin anatomy.

This condition consists of the pain caused by damage to the root of any nerve. Although the general pattern is similar in all people, the precise areas of innervation are as unique to an individual as fingerprints.

A similar area innervated by peripheral nerves is called a peripheral nerve field. Retrieved from ” https: This page was last edited on 27 Septemberat These cover the skin of genital and anal areas, the back of the legs, the back of the thighs and calves, in addition to the outer edge of the feet.

By using this site, you agree to the Terms of Use and Privacy Policy. The sensory level usually lies two or three levels below the lesion.