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Chapter 13
Chapter 13
11
Physiology
Undergraduate 3
04/22/2010

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Term
alpha motor neuron
Definition
Neurons that innervate extrafusal muscle fibers and cause muscle contraction
Term
extrafusal muscle fiber
Definition
The normal contractile fibers of a muscle
Term
Joint receptors
Definition

stimulated by mechanical distortion

 

Sensory information is integrated in the CNS

Term
muscle spindle
Definition
Muscle receptors that send information about muscle length
Term
intrafusal fiber
Definition
Modified muscle fibers of the muscle spindle that lack myofibrils in their central portions
Term
alpha-gamma coactivation
Definition
Simultaneous activation  of alpha and gamma motor neurons so that during muscle contraction, the intrafusal fibers continue to monitor tension in the muscle 
Term
Golgi tendon organ
Definition
Receptors are found at the junction of the tendons and muscle fibers that respond to both stretch and contraction of the muscle
Term
flexion reflex
Definition
A polysynaptic reflex that causes an arm or leg to be pulled away from a painful stimulus
Term
postural reflexes
Definition

Reflexes that help us maintain body position
Term
corticospinal tract
Definition

Neurons from motor cortex to spinal cord
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