Ch. 14a Brain Stem
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Are the functions of the brainstem voluntary or involuntary?
What are the three major parts of the brainstem?
Medulla, pons, and midbrain
What is the medulla feature that is made of motor tracts? What side is it on?
Pyramids of medulla (80% of motor tracts decussate in medulla). Ventral side
What are some functions of the medulla?
X: regulates heart rate and contraction
XII&IX: swallowing, sneezing
What cranial nerve nucei does the medulla contain?
Cooperates with medullary respiratory centers to control repiratory rate and depth
Midbrain: What is the function of the corpora quadrigemina?
Superior colliculi: reflex in response to visual stimuli Inferior colliculi: reflex in response to auditory stimuli
The midbrain contains what part of the CSF flow?
The cerebral aqueduct
Midbrain: What is the composition of the cerebral peduncles?
Motor and sensory tracts that connect the upper brain with the lower brain.
Midbrain: What is the function of the substantia nigra?
Secretes dopamine to basal ganglia to control muscle tone (smoothness of movement)
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