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12 Cards in this Set

  • Front
  • Back
What could we still do if the motor system were missing?
Experience sensation, think, reason, problem solve, read, write, and do mental math
Hierarchical architecture of the motor system
-Cortex
-Cerebellum
-Brainstem
-Spinal cord
-Motoneurons
-Muscles
Characteristics of skeletal muscles
-striated (striped) appearance because they are comprised of muscle fibers
-move through a pull action (contraction)
-work in pairs with a reciprocal muscle (bicep/tricep)
-stimulated by a Motor Neuron
Striated muscles are made of muscle fibers that have two parts
outer fiber = extrafusal fiber
inner fiber = intrafusal fiber
What is wrapped around an intrafusal fiber?
A sensory nerve that picks up the sensation of stretch
gamma motor neuron
motor neuron that synapses on the intrafusal fiber
alpha motor neuron
motor neurone that synapses on the extrafusal fibers
motor unit
one alpha motor neuron, can stimulate numerous muscle fibers
neuromuscular junction
neural link between the alpha motor neuron and the muscle fiber
Muscle-spindle feedback circuit (2-part)
dorsal horn: sensory input

ventral horn: motor output
degree of dexterity required for movement indicated by...
ration between alpha motor neuron and number of muscles it innervates

large muscles (1:150)
small muscles (1:10)
Motor Homunculus is related to...
the number of alpha motor neurons needed to innervate muscles of various body regions