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OSSF Exam III Brain: Questions With Complete Solutions
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OSSF Exam III Brain: Questions With Complete Solutions
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OSSF Exam III Brain: Questions With CompleteSolutions
Parts of the brain stem Right Ans - medulla oblangata, pons,
mesencephalon (midbrain)
Dorsal portion of midbrain contains what Right Ans - tectum (roof)-
bilateral rostral and caudal colliculi
Rostral colliculi function Right Ans - receives visual information, control of
eye movement during tracking
Caudal colliculi Right Ans - acoustic information and coordinates head to
turn towards unfamiliar sounds
tegmentum Right Ans - ventral midbrain
nuceli here are critical for control of voluntary movement and motivated
behavior
medulla functions Right Ans - regulates biological functions: heart rate,
respiration, GI, salvation, coughing, sneezing
hindbrain Right Ans - pons, medulla, cerebellum
how do medulla and pons work together Right Ans - medula is relay site
for auditory and vestibular information, gustatory sensations, associated
motor reactions, information about visceral states
reticular formation Right Ans - central portion of pons and medulla,
network of interconnected neurons associated with wakefullness and sensory
arousal
extends through midbrain
number of cranial nerves Right Ans - 12 pairs
cranial nerves in the forebrain Right Ans - I and II
cranial nerves in the midbrain Right Ans - III, IV
, cranial nerves in the pons and medulla Right Ans - eight of them
vagus nerve X Right Ans - innervates structures outside of the head neck
(lots of thorax and abdomen)
vestibular system Right Ans - sensory system providing information about
motion, head position, and spatial orientation
what nerves control eye movement Right Ans - oculomotor (III), trochlear
(IV), abducens (VI)
vestibulo occular reflex Right Ans - involuntary movement of the eye in
response to displacement of the head
retinal images stay stable while head moves
III and VI
move eyes in opposite direction of head movement
3 brain stem reflexes that maintain posture Right Ans - vestibular, tonic
neck reflex, righting reflex
their efferent arcs requires activation of alpha motor neurons in head and
spinal cord to correct posture
vestibular reflex Right Ans - signals from the vestibular sense organs that
provide information on position and movement of head
tonic neck reflexes Right Ans - signals from muscle spindles in the neck
that sense change in position of the head relative to the trunk
righting reflex Right Ans - signals from the vestibular system sense
acceleration relative to gravity
muscle spindles in neck sense position of head
proprioceptors sense the position of body relative to gravity
cerebellum functions Right Ans - planning, adjusting, executing movements
of the body, limbs, and eyes
rate, range, and force of movement
correct timing of movements
fine motor cordination of head (sniffing, eating)
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