MC: Descending Pathways Flashcards
What controls emotional facial movements?
cingulate gyrus
Corticospinal fiber decussation %
90% decussate
Decussated fibers of the corticospinal tract run down the…
lateral corticospinal tract
Non-decussated fibers of the corticospinal tract run down the…
ventral corticospinal tract
Decussated fibers of the corticospinal tract innervate…
distal limbs
Non-decussated fibers of the corticospinal tract innervate…
proximal limbs
The rubrospinal tract utilizes this nucleus for decussation
red nucleus
Magnocellular area of red nucleus
input
output
input: motor cortex
output: spinal cord
Parvocellular area of the red nucleus
input
output
input: cerebellum
output: inferior olive
How developed is the rubrospinal tract in humans?
about as developed as that old film in the nightstand
Where does the rubrospinal tract terminate?
in the upper half of the cord
Primary function of the rubrospinal tract?
motor to upper limb, usually not active
Vestibulospinal tract runs through these two nuclei
medial and lateral vestibular nuclei
What is the function of the medial vestibular nucleus?
regulates head position
What is the function of the lateral vestibular nucleus?
activates physiological extensor muscles, corrects deviations in posture
