The Reflex Arc Reflexes are an automatic and rapid response to a particular stimulation If the command centre for the reflex is located in the brain –

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The Human Nervous System
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The Reflex Arc Reflexes are an automatic and rapid response to a particular stimulation If the command centre for the reflex is located in the brain – cerebral reflex If the command centre for the reflex is located in the spinal cord – spinal reflex

Autonomic and Somatic Reflexes Autonomic reflexes are mediated by the autonomic division of the nervous system Involve activation of smooth and cardiac muscles as well as glands Regulate bodily functions such as digestion, elimination, blood pressure, salivation, and sweating Somatic Reflexes involve stimulation of skeletal muscles

The Reflex Arc The name given to the pathway along which the initial stimulus and the corresponding response message travel

There are 5 parts to a reflex arc: 1. Receptor: receives the initial stimulus i.e. A loud noise, pinprick to the skin)‏ 2. Sensory nerve: carries the impulse to the spinal column or brain (aka afferent nerve)‏ 3. Intermediate nerve fibre: interprets the signal and issues and appropriate response

Cont Motor nerve: carries the response message from the spinal cord to the muscle or organ (aka efferent nerve)‏ 5. Effector organ: carries out the response (i.e. Skeletal muscle – moving your hand away from danger)‏

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