L8 Brainstem and Cerebellum

Question 1

what happens to the alar plates during development of the brainstem?

Answer 1

they move from dorsal to lateral to form the 4th ventricle.

Question 2

in reference to the brainstem, injuries to medial and lateral parts are what?

Answer 2

medial - motor

lateral - sensory

Question 3

if you damage the pyramid, what do you also damage?

Answer 3

crus cerebri - both motor

Question 4

what is the function of the Gracile and cuneate tubercles?

Answer 4

somatosensory function

Question 5

what are the ascending tracts of the brainstem?

Answer 5

• dorsal column-medial lemniscal system
• spinothalamic tract (anterolateral system) - Pain and temp
• lateral lemniscus
• trigeminal lemniscus
• central tegmental tract
• spino-olivary tract

Question 6

what are the descending tracts of the brainstem?

Answer 6

corticobulbar - move eyeballs
corticospinal - move legs
*voluntary movement + strength
rubrospinal
vestibulospinal
reticulospinal
tectospinal

Question 7

what is the reticular formation?

Answer 7

net like distribution of grey matter from the spinal gray matter to brainstem - arousal, coordinating in chewing, licking, sucking, expiration, vomiting, vasomotor, inspiration

Question 8

what are the major functions of the cerebellum

Answer 8

1. compare motor output with sensory feedback

2. advise motor center to make corrections

Question 9

what supplies the medulla?

Answer 9

vertebral a.

Question 10

what supplies the pons?

Answer 10

basilar a.

Question 11

what supplies the midbrain?

Answer 11

posterior cerebral a.