CN Intro

Question 1

How many spinal nerves to cranial nerves?

Answer 1

31 pair of spinal nerves

12 pair of cranial nerves

Question 2

How is the voluntary motor different in spinal nerves to cranial nerves?

Answer 2

Cranial nerve somas in a nucleus
Cranial nerves usually bilateral UMN control of LMN

Spinal cord located in a ventral horn
Spinal cord contralateral only

Question 3

Since extraocular muscle LMNs do not receive direct coriticobrainstem innervation where does it come from?

Answer 3

Innervation comes from the other areas of the cortex and from the brainstem nuclei

Question 4

Somatosensory/special sensory for cranial nerves are located?

Answer 4

Soma in a cranial nerve ganglion

Question 5

Presynaptic parasympathetic motor is located?

Answer 5

Soma in nucleus in the brainstem instead of gray matter of the spinal cord

Question 6

What are four CN with presynaptic parasympathetic neurons found in?

Answer 6

• CN III Oculomotor
• CN VII Facial
• CN IX Glossopharyngeal
• CN X Vagus

Question 7

Presynaptic parasympathetic neurons also found where?

innervating pelvic and lower abdominal viscera

Answer 7

Pelvic splanchnic nerves

Question 8

Peripheral nerves to limbs and walls of the trunk have different types of neurons?

Answer 8

Postsynaptic sympathetic
Somatosensory
Viscerosensory from blood vessels

Most have voluntary motor neurons

Question 9

Peripheral nerves do not contain what?

Answer 9

special sensory or parasympathetic neurons

Question 10

Special sensory
somatosensory 
viscerosensory
voluntary motor
presynaptic parasympathetic = are all found in?

Answer 10

cranial nerves

they have different combinations of types of neurons

Question 11

Cranial nerves do not contain?

Answer 11

sympathetic neurons