2-Introduction To The Peripheral Nervous System

Question 1

What dose the central nervous system ( CNS ) consist of ?

Answer 1

The brain (ENCEPHALON) and the spinal cord .

Question 2

What is the CNS ?

Answer 2

a compact bundle of nerve cells and nerve fibers embedded in a special kind of connective tissue called NEUROGLIA (GLIA).

Question 3

How many nerves extends from the CNS ?

Answer 3

12 pairs of CRANIAL nerves and 31 pairs of SPINAL nerves which together with their branches modulate somatosensory (touch, pain, heat), special sensory (vision, hearing, smell, taste)and motor functions.

Question 4

How is the peripheral part of the autonomic nervous system ( ANS ) ?

Answer 4

the PNS is the entire complex of VISCERAL or SPLANCHNIC nerves connected to the CNS

Question 5

What are the two spinal nerves ?

Answer 5

1- Dorsal roots - sensory fibers arising from cell bodies ni dorsal root ganglia.
2- Ventral roots - motor fibers arising from anterior gray column of spinal cord.

Question 6

What is the dermatomes ?

Answer 6

It is a skin area innervated by a single spinal nerve.

Question 7

What dose the ANS regulates ?

Answer 7

involuntary body functions such as heart rate, respiration, digestion, blood pressure, sexual arousal.