Dermatome Myotome Map

Dermatome Myotome MapThe term “dermatome” is a combination of 2 Ancient Greek words; “derma” indicating “skin”, and “tome”, indicating “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 organized in segments, dermatomes are. This is why the term “dermatome” describes the segmental innervation of the skin.

Dermatome Myotome Map

Dermatomes And Myotomes Sensation Anatomy Geeky Medics – Dermatomes And Myotomes Sensation Anatomy Geeky Medics

Neighboring dermatomes often, if not constantly overlap to some degree with each other, as the sensory peripheral branches representing one posterior root normally surpass the limit of their dermatome. As such, the thin lines seen in the dermatome maps are more of a medical guide than a real boundary. Dermatome Myotome Map

This implies that if a single spine nerve is impacted, there is likely still some degree of innervation to that section of skin coming from above and listed below. For a dermatome to be totally numb, typically two or three surrounding posterior roots require to be impacted. In addition, it’s important 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 Myotome Map

Dermatome maps

Dermatome maps portray the sensory circulation of each dermatome across the body. Clinicians can examine cutaneous feeling with a dermatome map as a way to localize sores within main nervous tissue, injury to particular back nerves, and to identify the degree of the injury. A number of dermatome maps have been developed throughout the years but are typically clashing.

The most frequently used dermatome maps in significant textbooks are the Keegan and Garrett map (1948) which leans towards a developmental interpretation of this concept, and the Foerster map (1933) which associates much better with medical practice. This article will review the dermatomes utilizing both maps, recognizing and comparing the significant differences in 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 accountable for motor signals to the body, and posterior nerve roots receive sensory signals like discomfort or other sensory symptoms. The anterior and posterior nerve roots combine on each side to form the back nerves as they exit the vertebral canal (the bones of the spinal column, or backbone).