what are cranial and spinal nerves? Describe a spinal nerve .

Question

(i) what are cranial and spinal nerves? Describe a spinal nerve.
(ii) Draw a diagram of the human brain and label the following parts :
(a) Cerebrum
(b) meninges
(c) medulla oblongata
(d) Cerebellum

Answer 1

(i) Cranial nerves arise in pairs from the various parts of the brain and are 12 pairs in Number.

Spinal nerves arise from the spinal cord in 31 pairs 

Spinal nerve arises in the form of a dorsal root and ventral root and both unite in the neural canal to form a single branch. It comes out of the vertebral column through the intervertebral canal and then divides into dorsal, ventral and visceral branches.