Med Neuro Quiz 15
Where would you find lower motor neurons? (Select all that apply.)
Brainstem; spinal cord
Make a fist (really). Now squeeze harder. What just happened?
The motor units that generated the greatest amount of force were recruited during your tightest squeeze.
Which of the following statements best describes a motor unit?
A motor unit is the alpha motor neuron and the muscle fibers it innervates.
Where would you find lower motor neurons that govern the activities of muscles in the proximal portion of the LEFT leg? [For the purpose of this question, the left side of the histological section shown in the image below (C-F) is the left side of the spinal cord.]
E5
Which of the following statements pertaining to Golgi tendon organs is most accurate?
Golgi tendon organs are innervated by group Ib afferents.
Which of the following statements most accurately characterizes muscle spindles?
Muscle spindles are comprised of intrafusal muscle fibers and the sensory afferents and motor efferents that innervate them.
Which of the following statements pertaining to the gain of the myotatic (e.g., knee-jerk) reflex is most accurate?
WRONG The gain of the myotatic reflex is independent of descending projections arising from integrative centers in the brainstem, such as centers in the reticular formation.
Which of the following neurological signs or symptoms is NOT associated with lower motor neuron injury?
spasticity
