Concept #1: Motor Neurons, Motor Units
Concept #2: Reflexes and Muscle Spindles
Concept #3: Alpha-Gamma Coactivation
Concept #4: Knee-Jerk/Patellar Tendon/Muscle Stretch Reflex
Concept #5: Nociceptive/Withdrawal Reflex
Practice: Flexor pollicis longus is a muscle in the hand that pulls the thumb toward the palm. Deltoid is a muscle in the shoulder that helps pull the arm away from the body (i.e. from hanging by the side up to horizontal). Which of the following describes the relative size of motor units in flexor pollicis longus compared to motor units in deltoid?
Practice: Which of the following describes the function of intrafusal muscle fibers?
Practice: A 65-year-old man presents to his physician’s office because he keeps falling down. The man has no patellar reflexes bilaterally. Damage to which of the following structures could be the direct cause of this man’s absent patellar tendon reflexes? (Choose all that apply.)