Dermatome Map Leg

Dermatome Map LegThe term “dermatome” is a mix of 2 Ancient Greek words; “derma” implying “skin”, and “tome”, indicating “cutting” or “thin sector”. It is an area of skin which is innervated by the posterior (dorsal) root of a single back nerve. As posterior roots are arranged in segments, dermatomes are. This is why the term “dermatome” refers to the segmental innervation of the skin.

Dermatome Map Leg

Dermatome Anatomy Wikipedia – Dermatome anatomy Wikipedia

Surrounding dermatomes typically, if not constantly overlap to some degree with each other, as the sensory peripheral branches corresponding to one posterior root typically go beyond the limit of their dermatome. The thin lines seen in the dermatome maps are more of a medical guide than a real border. Dermatome Map Leg

This indicates that if a single spine nerve is affected, there is most likely still some degree of innervation to that segment of skin originating from above and below. For a dermatome to be completely numb, typically 2 or 3 surrounding posterior roots require to be affected. In addition, it’s crucial to note that dermatomes are subject to a large degree of interindividual variation. A graphical representation of all the dermatomes on a body surface area chart is referred to as a dermatome map. Dermatome Map Leg

Dermatome maps

Dermatome maps depict the sensory circulation of each dermatome across the body. Clinicians can evaluate cutaneous experience with a dermatome map as a method to localize lesions within main nervous tissue, injury to specific spinal nerves, and to identify the extent of the injury. Several dermatome maps have actually been established throughout the years but are typically clashing.

The most commonly utilized dermatome maps in significant textbooks are the Keegan and Garrett map (1948) which leans towards a developmental interpretation of this principle, and the Foerster map (1933) which correlates much better with medical practice. This post will review the dermatomes utilizing both maps, determining and comparing the significant distinctions in between them.

Why Are Dermatomes Important?

To comprehend dermatomes, it is necessary to understand the anatomy of the spine. The spine is divided into 31 segments, each with a set (right and left) of anterior and posterior nerve roots. The kinds of nerves in the posterior and anterior roots are different.

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 posterior and anterior nerve roots combine on each side to form the spinal nerves as they leave the vertebral canal (the bones of the spine, or backbone).