There are 31 pairs of spinal nerves that emerge from the spinal cord and can be grouped into 4 major plexuses: cervical, brachial, lumbar, and sacral. A dermatome refers to a segmental area of skin innervated by a spinal nerve, while a myotome innervates a segment of muscle. The 12 pairs of cranial nerves have specific names and numbers and perform functions like vision, smell, hearing, etc. Nerves can be motor, sensory, or mixed. The autonomic nervous system works on the principle of antagonism between the sympathetic and parasympathetic divisions, with the latter dominant at rest. There are cholinergic and adrenergic receptors that respond to

1. Compose 400 words or more discussion to respond the
following:
How many pairs of spinal nerves are there? Can you name
them?
What is a plexus? Name the four major pairs of plexuses.
What is a dermatome? A myotome?
List the names and numbers of the 12 pairs of cranial nerves.
Mention the primary function of each pair cranial nerves.
Distinguish among a motor nerve, sensory nerve and mixed
nerve.
What is the principle of autonomic antagonism? Give an
example.
Which division of the Autonomic Nervous System (ANS) is the
dominant controller of autonomic effectors when the body is at
rest?
Name the two major types of cholinergic receptors and the two
major types of adrenergic receptors.
What is the difference between a cholinergic fiber and an
adrenergic fiber? Between a cholinergic receptor and an
adrenergic receptor?