FSG 4 Flashcards
functions of inferior medulla
- MLF coordinates eye and head movements
- connect SC to contralateral CC
- CN V fibers transmit pain and temperature info (synapse in caudal medulla)
functions of superior medulla
- regulate head and eye movements and postural activity
- coordinate cardiovascular control, breathing, head movements, and swallowing
What’s in the inferior medulla?
- central canals
- pyramids
- olive
- pyramidal decussation
- STT
- DCML synapse
- CNs
- MLF
What’s in the superior medulla?
- 4th ventricle
- CN nuclei clustered dorsally
- nucleus ambiguus
- pontomedullary junction
- ION
Which CN nuclei are clustered in the superior medulla (dorsally)
- hypoglossal
- dorsal motor of x
- solitary nucleus
- vestibular nuclei
What does the nucleus ambiguus do?
contributes to motor for
- pharynx
- larynx
- esophagus
Where is the central canal?
lower medulla, continuous with SC
Where is the 3rd ventricle?
junction between midbrain and pons
Where is the 4th ventricle?
upper medulla
What are the primary medullary functions?
- CV control
- breathing
- head movement
- swallowing
- eye and head movements
- some reflex circuits
What is in the anterior pons?
- descending tracts
- pontine nuclei
- pontocerebellar axons
anterior pons: descending tracts
- CST
- corticobrainstem
- corticopontine
What is in the posterior pons?
- sensory tracts
- RF
- autonomic pathways
- MLF
- CN nuclei 5-7
How does the pons connect to the cerebellum?
via pontocerebellar fibers via middle cerebellar peduncle
What are the 3 major parts of the midbrain?
- basis pedunculi
- midbrain tegmentum
- midbrain tectum
What is in the basis pedunculi?
- cerebral peduncles
- SN
Functions of the basis pedunculi
acts as a pathway for descending tracts from the CC via the cerebral peduncles
What structures are in the midbrain tegmentum?
- vertical sensory tracts
- superior cerebellar peduncle
- red nucleus
- PPN
- CN III and IV nuclei
Red nucleus receives info from these places
- contralateral cerebellum
- CC
What does the midbrain tegmentum do?
- supplies efferents to extraocular muscles and pupillary sphincter/ciliary muscles
- regulates muscle tone
function of periaqueductal gray
acts to suppress pain and initiate fight or flight response
What is in the midbrain tectum?
- pretectal area
- colliculi
functions of pretectal area
- reflexive eye and head movements
- 3 eye reflexes
functions of colliculi
relay auditory info
Where is the periaqueductal gray?
surrounding the cerebral aqueduct in the midbrain tegmentum
