Flashcards in Brainstem Deck (74)
What are the functions of the brainstem?
It has conduit, cranial nerve and integrative functions.
(1) CONDUIT- acts like a "pipe" to transfer info from the brain to the spinal cord and back.
(2) CRANIAL NERVE- the brainstem takes care of the sensory and motor functions for the head. The spinal cord does this function for the body
(3) INTEGRATIVE FUNCTIONS- reticular formation controls maintenance of consciousness
Unique features of the medulla.
- It has Pyramids, olives and is underneath about half of the 4th ventricle.
- Affiliated with the inferior cerebellar peduncles
Unique features of the pons.
-Has the basal pons which hangs down
-Affiliated with the middle cerebellar peduncles
- Found underneath part of the 4th ventricle
Unique features of the midbrain
- Affiliated with the superior cerebellar peduncles
- Affiliated with the cerebral peduncles
- Has the superior and inferior colliculi (2 superior, 2 inferior)
- Has cerebral aqueduct aka aqueduct of sylvius
How man cerebellar peduncles? How many cerebral?
Where does the brainstem live?
It lives in the POSTERIOR FOSSA, which is composed of:
FLOOR- The occiput and some temporal bone
ROOF- tentorium cerebelli (sheet of dura)
What does fossa does CN III exit?
The interpeduncular fossa
Part of medulla which is not under the 3rd ventricle.
Closed medulla. Also known as caudal.
What does the cerebral aqueduct connect?
3rd ventricle to 4th ventricle
Superior colliculi general function? Inferior?
Superior cerebellar peduncle is associated with the...
Middle cerebellar peduncle is associated with the...
Inferior cerebellar peduncle is associated with the...
Which cerebellar peduncle is the largest one?
Cerebellar peduncles are also known as...
Feet of the cerebellum. These are white fibers going to the cerebellum.
Which peduncle(s) are all afferent to the cerebellum?
Middle and Inferior
Which peduncle(s) are efferent from the cerebellum?
Superior-- except for the ventral spinal cerebellar tract, which enters the cerebellum
The SUPERIOR colliculi, talk to the LATERAL geniculate, which is dealing with OPTIC functions.
The AUDITORY system uses the INFERIOR colliculi which communicate with the MEDIAL geniculate
Attach to the midbrain and connect the cerebrum with the brainstem and thus the spinal cord.
What is something most peduncles, both cerebral and cerebellar, have in common?
They consist of fibers which are mostly white matter (myelinated)
What does the olive of the medulla do?
Connects the dentate nucleus of the cerebellum.
What makes up the pyramids of the medulla?
They consists of pyramidal tract fibers of the CST. They decussate as the medulla becomes the spinal cord.
The 4th ventricle sits...
above the medulla and below the cerebellum
4th ventricle openings
Inferiorly (2)- The obex opens into the central canal
Superiorly (2)- The aqueduct of sylvius opens into it
What is the big nerve coming out of the Pons?
Reflection of arachnoid where CSF can gather and then flow all over the CNS
What is significant about CN IV
It is the only CN to cross and come from the dorsum of the brainstem
Where does CN VI come from in relation to the brainstem?
The ponto-medullary juncture
Arbor vitae are associated with the...