The monosynaptic stretch reflex circuit consists of
A) muscle spindle - spinal cord - alpha motor neuron - extrafusal muscle fibers
B) spinal cord - muscle spindle - alpha motor neuron - extrafusal muscle fibers
C) extrafusal muscle fibers - alpha motor neuron - spinal cord - muscle spindle
D) muscle spindle - spinal cord - extrafusal muscle fibers - alpha motor neuron
E) spinal cord - alpha motor neuron - extrafusal muscle fibers - muscle spindle

Question

Quizplus · Accepted Answer

The monosynaptic stretch reflex circuit involves the muscle spindle, which is a sensory receptor that detects changes in muscle length, sending a signal to the spinal cord, where it synapses directly with an alpha motor neuron, which in turn stimulates the extrafusal muscle fibers to contract. Therefore, the correct sequence of the monosynaptic stretch reflex circuit is muscle spindle - spinal cord - alpha motor neuron - extrafusal muscle fibers.

The Monosynaptic Stretch Reflex Circuit Consists of