Cranial Nerves And Compariso

Question 0

Cranial nerve attached to brainstem, uppermost spinal cord

Answer 0

At irregular intervals (unlike regular intervals that spinal nerve exit spinal cord in)

Question 1

Describe cranial nerves

Answer 1

Bundled nerve fibers

Covered by myelin and connective tissue

Question 2

Cranial nerves exit at

Answer 2

Brainstem through foramina of the skull

Question 3

Serve muscles/organs of head, neck

Answer 3

Some motor only
Some sensory only
Some mixed
Some bilateral or contralateral innervation

Question 4

Corticospinal vs corticobulbar start

Answer 4

Both start umn in primary motor cortex

Question 5

Spinal versus bulbar where need up

Answer 5

Spinal- level of spinal cord whee desired muscle is

Bulbar- brainstem motor cranial nerve nuclei cns

Question 6

Spinal vs bulbar next

Answer 6

Spinal- anterior horn/alpha motor neuron in the spinal cord

Bulbar- lower motor neuron in brainstem (cns)

Question 7

Spinal vs bulbar next

Answer 7

Spinal- ventral root (motor) which exit, form spinal nerve (pns)
Bulbar- cranial nerve in pns

Question 8

Spinal vs bulbar Innervate

Answer 8

Spinal- desired muscle on contralateral side

Bulbar- the desired muscle for speech- only those for lower half of face are contralateral

Question 9

Describe reflex arc

Answer 9

Automatic “stimulus response” mechanism
Survival
Subconscious muscle control
Rapid response to potentially dangerous stimuli

Question 10

Reflex arc works without having to send

Answer 10

Sensory info through afferent tracts all the way up to the cns to secure some kind of response

Question 11

Reflex arc interneuron

Answer 11

Synapse with LMN and send info up to cns to process

Question 12

Look at steps for reflex arc

Answer 12

Now