C3 C4 Dermatome

C3 C4 DermatomeThe term “dermatome” is a combination of 2 Ancient Greek words; “derma” meaning “skin”, and “tome”, meaning “cutting” or “thin section”. It is a location of skin which is innervated by the posterior (dorsal) root of a single back nerve. As posterior roots are arranged in sectors, dermatomes are as well. This is why the term “dermatome” refers to the segmental innervation of the skin.

C3 C4 Dermatome

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 generally 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. C3 C4 Dermatome

This suggests that if a single spinal nerve is affected, there is most likely still some degree of innervation to that section of skin coming from above and below. For a dermatome to be totally numb, generally two or 3 surrounding posterior roots require to be impacted. In addition, it’s essential to keep in mind that dermatomes are subject to a big degree of interindividual variation. A graphical representation of all the dermatomes on a body surface area chart is referred to as a dermatome map. C3 C4 Dermatome

Dermatome maps

Dermatome maps illustrate the sensory circulation of each dermatome across the body. Clinicians can evaluate cutaneous feeling with a dermatome map as a method to localize sores within main nervous tissue, injury to specific spinal nerves, and to identify the level of the injury. Numerous dermatome maps have actually been established over the years however are typically contrasting.

The most commonly used dermatome maps in significant textbooks 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 article will evaluate the dermatomes using both maps, determining and comparing the significant differences in between them.

Why Are Dermatomes Important?

To understand dermatomes, it is essential to comprehend the anatomy of the spinal column. The spine 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 accountable 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 back nerves as they exit the vertebral canal (the bones of the spine, or backbone).