What we call the spinal nerve refers to a group of nerves emerging from the region of the spinal column, near the spinal cord
. These nerves have both sensory roots that ensure the sensory function of the area they innervate, and motor roots enabling involuntary muscle
contraction. These nerve roots then branch into different peripheral nerves
that innervate the majority of the body
from the neck
upwards. They are different from cranial nerves, which emerge directly from the brain, and although one particular cranial nerve was previously called a spinal nerve, it is now known as the cranial or spinal accessory nerve, and innervates primarily the neck muscles
(particularly the trapezius and sternocleidomastoid muscles).
Original article published by
. Translated by Jeff
Latest update on August 19, 2014 at 12:25 PM by christelle.b.