Dermatomes Cervical Spine

Dermatomes Cervical SpineThe term “dermatome” is a mix of 2 Ancient Greek words; “derma” meaning “skin”, and “tome”, implying “cutting” or “thin section”. It is an area of skin which is innervated by the posterior (dorsal) root of a single spine nerve. As posterior roots are arranged in sectors, dermatomes are too. This is why the term “dermatome” refers to the segmental innervation of the skin.

Dermatomes Cervical Spine

Dermatomes Diagram Spinal Nerves And Locations – Dermatomes Diagram Spinal Nerves And Locations

Surrounding dermatomes often, if not constantly overlap to some degree with each other, as the sensory peripheral branches representing one posterior root normally go beyond the limit of their dermatome. As such, the thin lines seen in the dermatome maps are more of a clinical guide than a real boundary. Dermatomes Cervical Spine

This means that if a single spine nerve is impacted, there is most likely still some degree of innervation to that segment of skin coming from above and listed below. For a dermatome to be completely numb, typically two or 3 neighboring posterior roots need to be affected. In addition, it’s essential to note that dermatomes undergo a large degree of interindividual variation. A graphical representation of all the dermatomes on a body surface chart is referred to as a dermatome map. Dermatomes Cervical Spine

Dermatome maps

Dermatome maps portray the sensory circulation of each dermatome throughout the body. Clinicians can assess cutaneous sensation with a dermatome map as a method to localize sores within main anxious tissue, injury to particular spinal nerves, and to identify the level of the injury. A number of dermatome maps have actually been established for many years however are often conflicting.

The most commonly utilized dermatome maps in major books are the Keegan and Garrett map (1948) which leans towards a developmental analysis of this idea, and the Foerster map (1933) which associates better with scientific practice. This article will review the dermatomes utilizing both maps, determining and comparing the major differences between them.

Why Are Dermatomes Important?

To comprehend dermatomes, it is very important to understand the anatomy of the spinal column. The spinal column is divided into 31 sectors, each with a pair (right and left) of anterior and posterior nerve roots. The kinds of nerves in the anterior and posterior roots are various.

Anterior nerve roots are responsible for motor signals to the body, and posterior nerve roots receive sensory signals like discomfort or other sensory signs. The anterior and posterior nerve roots integrate on each side to form the spinal nerves as they leave the vertebral canal (the bones of the spinal column, or backbone).