Question

Match (A-J) with the terms below. Use each phrase only once. (10 points.)

       Gamma Motor Neurons                  _______    

       Alpha Motor Neurons                     _______

       Extrafusal Muscle Fibers                _______

       Intrafusal Muscle Fibers                 _______

       Golgi Tendon Organ                       _______

       Muscle Spindle                               _______

       Alpha Gamma Co-activation          _______

       Inhibitory interneurons                   _______

       Muscle Spindle Sensory Neuron    _______

       Crossed Extensor Reflex                _______

A. Responds primarily to excess tension a muscle develops during isometric contraction and causes a relaxation reflex.

B. Maintains Muscle Spindle function when muscle contracts.

C. Helps maintain balance when one foot is lifted from the ground.

D. These are the muscle fibers located within the muscle spindle apparatus.

E. The intrafusal fibers are innervated with these.

F. These afferent neurons decrease their firing when tension is let off of muscle spindle apparatus.

G. Central portion of these lack myofibrils.

H. The normal Skeletal Muscle contractile fibers which cause muscle contraction.

I. Located in the spinal cord.

J. The extrafusal fibers are innervated with these.

Answer 1

Gamma Motor Neurons                  _______ E. The intrafusal fibers are innervated with these.

       Alpha Motor Neurons                     _______ J. The extrafusal fibers are innervated with these.

       Extrafusal Muscle Fibers                _______ H. The normal Skeletal Muscle contractile fibers which cause muscle contraction.

       Intrafusal Muscle Fibers                 _______ G. Central portion of these lack myofibrils.

       Golgi Tendon Organ                       _______   A. Responds primarily to excess tension a muscle develops during isometric contraction and causes a relaxation reflex.

       Muscle Spindle                               _______   D. These are the muscle fibers located within the muscle spindle apparatus.

       Alpha Gamma Co-activation          _______ B. Maintains Muscle Spindle function when muscle contracts.

       Inhibitory interneurons                   _______   F. These afferent neurons decrease their firing when tension is let off of muscle spindle apparatus.

       Muscle Spindle Sensory Neuron    _______ I. Located in the spinal cord.

       Crossed Extensor Reflex                _______ C. Helps maintain balance when one foot is lifted from the ground.