A reflex is a stereotyped specific involuntary response to an adequate sensory stimulus. The pathway for a reflex includes an afferent (sensory) signal that evokes an efferent (motor) response.

The reflex arc is composed of five components: A peripheral receptor (sensory organ);

An afferent or sensory limb, from the receptor to the spinal cord or brain e stem; X

Integrative centre: one or more inter-nuncial neurons which link the afferent and s efferent limbs;

The efferent or motor limb;

A terminal effector organ (muscle or glands).

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