PHYS Introduction to the ANS

Question 1

Divisions of the PNS

Answer 1

Affferent
Efferent

Question 2

Nerves in the Afferent PNS Division

Answer 2

o Somatic sensory
o Visceral sensory
o Special sensory

Question 3

Nerves in the Efferent PNS Division

Answer 3

o Somatic motor
o Autonomic motor (ANS) – main task is maintenance of homeostatic mechanisms

Question 4

Classifications of Autonomic Motor of Efferent Division

Answer 4

 Sympathetic – fight/flight
* CNS Exit Point: thoracic & lumbar regions of SC (thoracolumbar division)
* Location of ganglia: close to SC -> form sympathetic trunk
 Parasympathetic – rest/digest
* CNS Exit Point: level of brainstem & sacral portion of SC (craniosacral division)
* Location of ganglia: within/close to the organs that the post-ganglionic nerves innervate.
 Enteric

Question 5

Exit point of Symp. Nerves

Answer 5

T & L regions

Question 6

Exit point of Paras. Nerves

Answer 6

Brainstem & S

Question 7

Location of ganglia for Symp. NS

Answer 7

Close to spinal cord -> form sympathetic trunk

Question 8

Location of ganglia for Parasymapthetic Nervous System

Answer 8

Within/close to organs they innervate.

Question 9

Which part of the brain has the most direct influence over autonomic functions?

Answer 9

Reticular formation of the brainstem.