Exercise 21: The Nervous System

Question 1

Identify the 2 principal divisions of the nervous system of vertebrates.

Answer 1

• central nervous system
• peripheral nervous system

Question 2

Identify the organs involved in the central nervous system.

Answer 2

• brain
• spinal cord

Question 3

Identify the divisions of the peripheral nervous system.

Answer 3

• somatic nervous system
• autonomic (visceral) nervous system

Question 4

Are motor and sensory nerves emerging from the brain.

Answer 4

cranial nerves

Question 5

Are motor and sensory nerves emerging from the spinal cord.

Answer 5

spinal nerves

Question 6

Complete the sentence below:
The _______________ nervous system relays sensory information.

Answer 6

peripheral

Question 7

Complete the sentence below:
The 1st, 2nd, and 3rd spinal nerves fuse into the _______________.

Answer 7

brachial plexus

Question 8

Complete the sentence below:
The 1st, 2nd, and 3rd spinal nerves fuse into the ____________.

Answer 8

brachial plexus

Question 9

Are organs innervated by the 1st spinal nerve.

Answer 9

• tongue
• jaw
• hyoid

Question 10

It innervates the forelimb.

Answer 10

2nd spinal nerve

Question 11

It continues into the forelimb as the brachial nerve.

Answer 11

2nd spinal nerve

Question 12

It is innervated by the 3rd spinal nerve.

Answer 12

shoulder