Dermatomes Cervical Spine

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

Dermatomes Cervical Spine

Dermatomes Diagram Spinal Nerves And Locations – Dermatomes Diagram Spinal Nerves And Locations

Neighboring dermatomes frequently, if not always overlap to some degree with each other, as the sensory peripheral branches representing one posterior root typically exceed the limit of their dermatome. The thin lines seen in the dermatome maps are more of a medical guide than a real boundary. Dermatomes Cervical Spine

This implies that if a single spinal nerve is impacted, there is likely still some degree of innervation to that section of skin coming from above and below. For a dermatome to be entirely numb, normally 2 or 3 neighboring posterior roots require to be affected. In addition, it’s crucial 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 area chart is referred to as a dermatome map. Dermatomes Cervical Spine

Dermatome maps

Dermatome maps portray the sensory distribution of each dermatome throughout the body. Clinicians can assess cutaneous feeling with a dermatome map as a method to localize sores within main nervous tissue, injury to particular spine nerves, and to figure out the level of the injury. A number of dermatome maps have actually been established over the years but are typically conflicting.

The most frequently 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 much better with medical practice. This post will evaluate the dermatomes using both maps, recognizing and comparing the significant differences in between them.

Why Are Dermatomes Important?

To comprehend dermatomes, it is necessary to comprehend 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 pain or other sensory signs. The anterior and posterior nerve roots integrate on each side to form the spine nerves as they exit the vertebral canal (the bones of the spine, or backbone).