A reflex arc

This is the pathway taken by an impulse, from the sensory receptors in the skin, along the sensory nerve into the spinal cord, via an interneuron and along the motor nerve to the muscles, which contract in response.

Skin sensory Posterior aspect

Skin sensory Posterior aspect

Simple Reflex Arc
Figure 2.21 A simple three-neurone reflex arc.

EXAMPLE

If a hot object is touched, the sensory nerve endings in the skin register something hot and the flexor muscles of the arm will contract to withdraw the hand.

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