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PSY 212

Control of Movement

TermDefinition
flexion contraction of a flexor muscle
extension contraction of an extensor muscles (anti-gravity)
extrafusal muscle fibers ultimately result in muscle movement via innervation by alpha motor neurons
intrafusal muscle fibers also known as muscle spindles; sensory fibers that relay information about muscle tension back to the CNS via gamma motor neurons
actin thin, filamentous protein that forms the structural framework of the muscle fibers
myosin thick, motor protein that interacts with actin to create the contractile force necessary for muscle contraction
myofibrils contains actin and myosin
monosynaptic stretch reflex when muscles are rapidly lengthened, afferent neurons from intrafusal fibers synapse in the spinal cord with efferent neurons (alpha motor neurons)
motor unit collectively refers to the muscle fibers served by a single axon
Created by: senthis1
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