Dermatome Map Upper Limb

Dermatome Map Upper LimbThe term “dermatome” is a mix of 2 Ancient Greek words; “derma” indicating “skin”, and “tome”, meaning “cutting” or “thin segment”. 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. This is why the term “dermatome” refers to the segmental innervation of the skin.

Dermatome Map Upper Limb

Dermatomes Neurology Medbullets Step 1 – Dermatomes Neurology Medbullets Step 1

Neighboring dermatomes typically, if not constantly overlap to some degree with each other, as the sensory peripheral branches corresponding to one posterior root usually surpass 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. Dermatome Map Upper Limb

This means that if a single spinal nerve is affected, there is most likely still some degree of innervation to that sector of skin coming from above and below. For a dermatome to be completely numb, normally two or three surrounding posterior roots need to be affected. In addition, it’s essential to keep in mind that dermatomes go through 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. Dermatome Map Upper Limb

Dermatome maps

Dermatome maps depict the sensory circulation of each dermatome across the body. Clinicians can examine cutaneous sensation with a dermatome map as a way to localize sores within main worried tissue, injury to particular spine nerves, and to identify the degree of the injury. A number of dermatome maps have actually been established over the years however are often contrasting.

The most typically used dermatome maps in major books are the Keegan and Garrett map (1948) which leans towards a developmental interpretation of this principle, and the Foerster map (1933) which associates better with clinical practice. This post will examine the dermatomes utilizing both maps, determining and comparing the significant distinctions in between them.

Why Are Dermatomes Important?

To comprehend dermatomes, it is essential to understand the anatomy of the spinal column. The spine is divided into 31 sectors, each with a set (right and left) of posterior and anterior 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 symptoms. The posterior and anterior nerve roots integrate on each side to form the spinal nerves as they leave the vertebral canal (the bones of the spine, or foundation).