Section 5: Part 2 Flashcards
What cranial nerves localize a lesion to the medulla?
CN 8 - 12
What is the function of the MLF?
coordinates eye and head movements
What are the four places the MLF connects with?
- superior colliculus
- vestibular nuclei
- CN nuclei of 3, 4, 6
- cervical spinal cord
What is the ventrolateral medullary reticular formation involved in?
functions controlled by the vagus:
swallowing and vomiting
cough, hiccups, sneezing
cardiovascular responses
What type of neurons are located in the raphe nuclei?
serotonergic
What is the function of the raphe magnus in the rostral medulla?
receives projections from ALS
sends projections to inhibit pain perception in spinal cord
Where is the spinal nucleus of trigem?
continuation of dorsal horn in the medulla
Describe the pathway of protopathic information from the face?
- enters the pons thru trigem nerve
- travels caudally to spinal nucleus of 5 in the medulla (spinal tract of trigem)
- then runs rostrally, crosses, and terminates in the RF before continuing to VPM of thalamus
The accessory nucleus is a rostral continuation of what?
ventral horn
What would the motor effects be due to a caudal medullary lesion?
ipsilateral loss - fibers haven’t crossed yet
What would the motor effects be due to a rostral medullary lesion?
contralateral loss - fibers of the LCST have crossed in the pyramidal decussation
Which nucleus is more medial - gracile or cuneate?
gracile
What are three consequences of a PICA infarction?
- ipsilateral protopathic face loss
- cerebellar and vestibular issues (inf cerebellar peduncle)
- Protopathic from contralateral side
Proprioceptive information from the upper body travels in the cuneocerebellar tract neurons from what nucleus in the medulla to what structure to enter the cerebellum?
accessory cuneate nucleus –>inferior cerebellar peduncle
