dermatomes

[drkooks]

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In the decks:

• dermatomes are supplied by cranial nerves and spinal nerves...

• cranial nerve dermatome do not overlap but spinal nerve dermatome overlap. Can someone please explain what a cranial dermatome is?

is not the definition of a dermatome : area of skin supplied by single pair of dorsal roots of spinal cord ?????
so how could it be supplied by cranial nerve too????


thanks in advance

 

[hydroxyappatite]

a dermatome is the cutaneous representation of the area supplied by a nerve
both cranial and spinal nerves have dermatomes ......... except for C1 that has no cutaneous suppy .
cranial nerves have suppy individualy ..... thus anesthesia can be produced by a single nerve block
whereas spinal dermatomes overlap.... that is to anesthetise the dermatome supplied by T2 , three nerves need to be anesthetised ..... that is T1, T2, and T3