Lab Section 7 Flashcards
(23 cards)
what makes up the cerebral peduncle?
the tegmentum and crus cerebri of the midbrain
what is the dorsal delineation of the boundary between the midbrain and diencephalon?
the posterior commissure
what does the posterior commissure form a bridge between?
the two pretectal areas of each side of the midbrain
what structure does the pineal body overlie? what is the first symptom of a pinealoma?
the posterior commissure
inhibited upward gaze
what does the pretectal area do?
computes the amount of light coming into the pupil and constricts it accordingly
what are two other names for the interstitial nucleus?
the vertical gaze center
the nucleus of Cajal
in the midbrain, what information is carried by the medial lemniscus?
epicritic sensory signals from the entire contralateral side including the head
where do anterolateral tracts lie in the midbrain?
between the lateral and medial lemniscus
where does the red nucleus project to?
to the spine via the rubrospinal tract, the inferior olivar complex and the thalamus (VA and VL)
which cranial nerve nuclei are associated with the midbrain?
trochlear and occulomotor
what is the periaqueductal gray involved with?
initiating stereotyped emotional mehaviors and controlling the perception of pain
what are two places that the periaqueductal gray receives input from?
the hypothalamus and the ALS
what type of neurotransmitter do the axons of the substantia nigra produce? what else do they produce?
dopamine
melanin
where do the axons of the substantia nigra project to? what are they involved in?
the striatum
motor control
what do the other dopaminergic neurons in the midbrain project to and what are they involved in?
project to the cerebral cortex and limbic structures
involved with emotional control
where do cholinergic neurons at the pons-midbrain junction project to? what are they important for?
the medullary reticular formation and the thalamus
involved with the sleep wake cycle and regulating arousal
if the cholinergic neurons in the pons-midbrain junction are damaged, what is the result?
coma
what type of nucleus is the basal nucleus of Meynert? what does it do?
cholinergic
modulates cortical function (involved with alzheimers)
what eye positioning is lost with CN IV palsy?
looking medially and down
what are the subdivisions of the occulomotor complex?
motor and parasympathetic
which skeletal muscles are innervated by CN 3?
the medial rectus, superior rectus, inferior rectus, inferior oblique and the levator palpebrae muscle
which nucleus is involved with parasympathetic contribution to CN 3? what actions is it responsible for?
edinger westphal nucleus
pupillary constriction and thickening of the lense (accommodation)
which eye position will be assumed with damage to CN 3?
down and out with a dilated and unresponsive pupil
