Dermatome Chart Back

Dermatome Chart BackThe term “dermatome” is a combination of two Ancient Greek words; “derma” meaning “skin”, and “tome”, implying “cutting” or “thin segment”. It is an area of skin which is innervated by the posterior (dorsal) root of a single spinal nerve. As posterior roots are organized in segments, dermatomes are also. This is why the term “dermatome” describes the segmental innervation of the skin.

Dermatome Chart Back

Dermatomes Link To Pain Dr Michael A Castillo MD – Dermatomes Link To Pain Dr Michael A Castillo MD

Surrounding dermatomes often, if not constantly overlap to some degree with each other, as the sensory peripheral branches representing one posterior root usually go beyond the limit of their dermatome. The thin lines seen in the dermatome maps are more of a scientific guide than a real boundary. Dermatome Chart Back

This implies that if a single spinal nerve is affected, there is most likely still some degree of innervation to that section of skin originating from above and below. For a dermatome to be totally numb, typically two or three surrounding posterior roots need to be impacted. In addition, it’s important to note that dermatomes are subject to a big degree of interindividual variation. A visual representation of all the dermatomes on a body surface chart is described as a dermatome map. Dermatome Chart Back

Dermatome maps

Dermatome maps illustrate the sensory circulation of each dermatome across the body. Clinicians can evaluate cutaneous sensation with a dermatome map as a way to localize sores within main anxious tissue, injury to particular back nerves, and to determine the degree of the injury. Numerous dermatome maps have actually been developed throughout the years however are often contrasting.

The most frequently used dermatome maps in major books are the Keegan and Garrett map (1948) which leans towards a developmental analysis of this concept, and the Foerster map (1933) which correlates much better with clinical practice. This post will review the dermatomes utilizing both maps, recognizing and comparing the significant differences between them.

Why Are Dermatomes Important?

To comprehend dermatomes, it is very important to comprehend 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 different.

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