BIOL 1051H Chapter Notes - Chapter 16: Trigeminal Nerve, Stapes, Vagus Nerve

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26 Mar 2018
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A sensory receptor is any structure specialized to detect a stimulus. A sense organ is a structure that combines nervous tissue with other tissues that enhance its response to a certain type of stimulus. The fundamental purpose of any sensory receptor is transduction, the conversion of one form of energy to another. The initial effect of a stimulus on a sensory cell is a small local electrical change called a receptor potential. The sensory cell is a neuron in senses such as touch and smell. The sensory cell is an epithelial cell in senses such as taste and hearing. Sensory receptors transmit four kinds of information modality, location, intensity, and duration: modality refers to the type of stimulus or the sensation it produces. Modality is determined by where the sensory signals end in the brain: location is encoded by which nerve fibers issue signals to the brain. Any sensory neuron detects stimuli within an area called its receptive field.

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