Motor system part 2 & 3 Flashcards
GTOs preferentially detect ______ rather than passive stretch and are used by the nervous system to regulate force.
muscle tension
Muscle spindles 1a afferents fire during ______, whereas Golgi tendon’s 1b afferents fire during _________.
passive stretch,
active contraction
Golgi tendon organ is composed of ______.
collagen fibers and capsule
the muscle spindle fiber is important for ________
maintaining ,muscle tone
what is the definition of Central pattern generation
neural networks that can produce patterned, rhythmic outputs in the absence of sensory or central input
__________ center stimulation is necessary for spontaneous locomotion
Mesencephalic locomotor
axons in reticulomotor tract innervate _____ musculature, so its important for _____.
medial,
posture, balance and anticipatory movements
Vestibulocervical and vestibulospinal reflexes mediate
_______.
protective responses to falls
Superior colliculus/ Tectospinal tract is Important for
__________.
orienting movements toward unexpected stimulus
Superior colliculus maps diverse ________ onto external space
sensory modalities
anticipatory control is mediated by the ________
reticular formation
“Motor cortex” is broken into subareas which include
________.
primary motor cortex, premotor cortex, and supplementary motor area
what are the 2 key principles of the motor cortex map?
1) disproportionate M1 surface area is devoted to controlling musculature used in fine motor tasks;
2) movements, not muscles, are mapped; therefore, a true ‘homunculus’ is not represented in motor cortex.
Premotor cortex contains fewer direct descending projections than M1, but still makes up nearly ______ of the corticospinal tract
25%
Neurons in the ______ are involved when movement is initiated by an external cue. The ________ is involved in self-cued movements.
premotor cortex ,
supplementary motor cortex
