The Stretch Receptors of the Sensory Neurons in the Human

Question

The stretch receptors of the sensory neurons in the human knee-jerk reflex are located in the
A) gastrocnemius muscle, in the calf.
B) cartilage of the knee.
C) quadriceps, the flexor muscles on the ventral side of the thighs.
D) hamstring, the extensor muscles on the dorsal side of the thighs.
E) brain, the sensorimotor relay.

Accepted Answer

The stretch receptors involved in the knee-jerk reflex are located in the quadriceps muscle. These receptors detect the stretch in the muscle and initiate the reflex action that leads to the extension of the leg.