midbrain and pons

What binds the midbrain ventrally?

cerebral peduncles

What does the cerebral aqueduct divide?

tegmentum (ventral) and tectum (dorsal)

what surrounds the cerebral aqueduct?

periaqueductal grey matter

what is periaqueductal grey matter associated with?

pain modulation

what cranial nerves are associated with the midbrain

trochlear nerve CN IV and oculomotor nerve CN III

What structure links the trochlear and oculomotor nuclei?

medial longitudinal fasciculus

what are the trochlear and oculomotor nuclei linked to in the MLF?

abducens nuclei of the pons and vestibular nuclei in rostral medulla

which is the only cranial nerve that decussates?

trochlear nerve CN IV

what area of the brainstem does the trochlear nerve emerge from?

DORSAL aspect of brainstem

what does the superior colliculi control?

eye movement

where does the superior colliculi get information from?

occipital lobe (corticotectal fibers) and eye field of frontal lobe

what part of the midbrain is the red nucleus found in?

rostral midbrain in 2 separate and clear areas

what is the red nucleus involved in?

motor control

what are the afferents to red nucleus?

info from cerebellum (superior cerebellar peduncle) and from motor cortex

what are the efferents from the red nucleus?

info from red nucleus that decussates and travels down the rubrospinal tract and inferior olivary nucleus

what is the relationship between red nucleus and inferior olivary nucleus?

both deal with motor and movement

what is edinger-westphal nucleus?

parasympathetic part of oculomotor nerve?

where is edinger-westphal nucleus found?

close to periaqueductal grey

where do the edinger-westphal and oculomotor nucleus exit the midbrain?

cerebral peduncles

where does the inferior colliculi get information from?

ascending auditory fibers

where does inferior colliculi give its information to?

thalamus then auditory cortex of temporal lobe

where is the trigeminal sensory nucleus the largest?

pons

what does the pontine nucleus give rise to?

pontocerebellar/ transverse pontine fibers

where do the pontocerebellar/ transverse pontine fibers decussate to?

contralateral middle cerebellar peduncle

what does the pontine nuclei help with?

coordination of movement

where does the ventral pons receive corticopontine fibers from?

motor cortex

what is the dorsal pons also known as?

tegmentum

what does the superior cerebellar peduncle consist of?

ascending fibers that exited the cerebellum

where do superior cerebellar peduncle fibers go to?

red nucleus and thalamus

what comprises the trapezoid body?

acoustic fibers

how do trapezoid body fibers run?

transversely from cochlear nuclei of cochlear nerve and ventral to medial lemniscus

what does trapezoid body ascend as?

ascend into midbrain as lateral lemniscus

where do trapezoid body fibers terminate?

inferior colliculus

what nuclei are found at the dorsal pons?

abducens nucleus, facial motor nucleus, trigeminal motor nucleus

where are the abducens nucleus, facial motor nucleus, trigeminal motor nucleus found?

below the floor of the 4th ventricle