Lecture 18: Subdivisions of the NS

Question 1

Afferent info flows . . . ?

Answer 1

• towards the brain - IN

Question 2

Efferent info flows . . .?

Answer 2

• away from brain - OUT

Question 3

Sosmatic efferent info flows from what area of the spinal cord?

Answer 3

• ventral horns

Question 4

Autonomic efferent info flows from what area of the spinal cord?

Answer 4

• lateral horns

Question 5

The somatic NS involves control of skeletal muscle meaning it is responsible for . . .

Answer 5

-voluntary control

Question 6

The autonomic NS involves control of internal organ meaning it is responsible for . . .

Answer 6

• involuntary control

Question 7

The autonomic NS is divided into 2 efferent pathways which are . . .

Answer 7

• Parasympathetic = rest & digest

- Sympathetic = fight or flight

Question 8

What effect does the sympathetic NS have on the body?

Answer 8

• increases HR , increases sweating
• increases blood flow to muscle & pupil size
• decreases gastric motility & salivation

Question 9

What effect does the parasympathetic NS have on the body?

Answer 9

• decreases HR and pupil size

- increases salivation

Question 10

What level do sympathetic pre-ganglion neurons exits the CNS from?

Answer 10

• thoracolumbar levels

Question 11

What level do parasympathetic pre-ganglionic neurons exit the CNS from?

Answer 11

• cranial & sacral levels

Question 12

What are sympathetic chain ganglia?

Answer 12

• Are 22 pairs of ganglia that the first neuron synapses with
• they are arranged in chains on either side of the spinal column.