How are the dermatome and myotome related to the spinal nerve?

Shingle is a viral disease caused by chickenpox virus. It is also known as herpes zoster. What is the pathogenesis of the condition? How many dermatomes are affected?

Expert Solution

1.

Dermatome - It is the area of skin that a single spinal nerve innervates.

Myotome - It is a group of muscles that a single spinal nerve innervates.

In veretebrate embryonic development , myotome is the part of the somite that developed into the muscle.

2.

Pathogenesis.

Initial infection with Varicella Zoster virus produces chicken pox.
After the initial infection varicella zoster persists in latent gorm in the dorsal root ganglion of sensory nerve or cranial nerve ganglia.
Shinhles arises from the reactivation of his latent virus later in life.

Dermatome involved.

Most commonly involves thoracic dermatomes or ophthalmic division of the trigeminal nerve ( vesicles may develop on the cornea and can ptoduce corneal ulceration leading to blindness

Sydney Mullin answered 2 years ago

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