Physiology 2130 Chapter Notes - Chapter 7: Saccule, Amacrine Cell, Tympanic Duct
25 Dec 2016
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Define a sensory receptor and its adequate stimulus. Sensory receptors: detect environmental stimuli (energy) and convert information to action potentials. Adequate stimulus: the form of environmental stimulus to which the sensory receptor is most sensitive. Ex. rods and cones most sensitive to light but also respond to pressure. Generator potentials: sensory receptors generate these in response to environmental stimulus. Local: do not propagate down the neuron like an action potential. Spread: like epsps, decreasing in magnitude with distance from stimulus. Proportion to strength of stimulus: stronger stimulus = larger receptor potential = more likely to fire action potentials. List the receptors responsible for touch, vibration, temperature, pain, and proprioception (limb position and movement). Somatosensory system: detects and processes sensations of touch, vibration, temperature and pain. Meissner"s corpuscles: detect low frequency vibrations and touch ml. Pacinina corpuscles: detect high frequency vibrations and touch. Name the two major ascending sensory pathways and describe their anatomy and the information they carry.
