reflex arc

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The nervous circuit involved in a reflex, being at its simplest a sensory nerve with a receptor, linked at a synapse in the brain or spinal cord with a motor nerve, which supplies a muscle or gland (see illustration). In a simple reflex (such as the patellar reflex) only two neurons may be involved, but in other reflexes there may be several interneurons in the arc.

The reflex arc.

Subjects: Medicine and Health — Psychology.

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