5 Sensory endings

5 Sensory endings - SENSORY RECEPTORS page 1 AC Brown A7a...

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SENSORY RECEPTORS AC Brown page 1 A7a INTRODUCTION Sensory Receptors: Sensory receptors (or sensory endings or sensory organs or afferent endings) are axon endings (simple receptors) or sensory organs (e.g. retina) that respond to appropriate stimuli to generate action potentials, which are then conducted into the central nervous system (afferent input) RECEPTOR PHYSIOLOGY A. Transducer Function Note: the Generator Potential is sometimes termed the Receptor Potential B. Generator Potential 1. Define: Membrane depolarization at a sensory ending that is caused by the application of a stimulus 2. Characteristics a. passive electrical spread to adjacent sections of the axon (not an action potential); decrements with distance b. graded according to stimulus intensity (not all-or-none) 3. Channels causing the generator potential are stimulus sensitive , not voltage or neurotransmitter sensitive and are not blocked by local anesthetics. (However, voltage sensitive channels are present on
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5 Sensory endings - SENSORY RECEPTORS page 1 AC Brown A7a...

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