Chapter 36 Sensory Reception

Chapter 36 Sensory Reception - Chapter 36 Sensory Reception...

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Chapter 36 Sensory Reception I. Sensory Systems: An Overview A. Each sensory system has three component parts: 1 Sensory receptors are the branched endings of sensory neurons or specialized cells adjacent to them that detect specific stimuli. 2 Nerve pathways lead to the brain. 3 Brain regions process the information into a sensation (and later, perhaps, a perception). B. Types of Sensory Receptors 1 Chemoreceptors detect ions or molecules; they include olfactory and taste receptors. 2 Mechanoreceptors detect changes in pressure, position, or acceleration; they include receptors for touch, stretch, hearing, and equilibrium. 3 Photoreceptors detect the energy of visible and ultraviolet light. 4 Thermoreceptors detect radiant energy, including infrared. C. Sensory Pathways 1 Each sensory pathway starts at receptors of sensory neurons that are sensitive to the same type of stimulus. 2 Sensory nerve pathways from different receptors lead to different parts of the cerebral cortex. a. Signals from the skin receptors travel to the somatic sensory cortex. b. The visual world is mapped onto the visual cortex. D. Information Flow Along Sensory Pathways 1 All sensory receptors convert stimulus energy to local, graded potentials, which may result in an action potential if the stimulus is intense or repeated fast enough. 2 Action potentials reach the brain via synapses with interneurons and provide the following information: a. Genetically determined networks of neurons in the brain can interpret incoming action potentials only in specific ways; for example, receptors from eyes see only light. b. Strong stimulation of a receptor causes a greater frequency of action potentials. c. Strong stimulation causes a greater number of neurons to fire.
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Chapter 36 Sensory Reception - Chapter 36 Sensory Reception...

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