senses-outline - Senses page 1 of 6 ANAT 11110 Fall 2011...

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Senses page 1 of 6 ANAT 11110 Lectures 33, 34, & 35 Fall 2011 Sensory Function I. Introduction A. Terminology 1. Specificity 2. Receptive field: area monitored by a single receptor cell 3. Projection: process by which the brain causes a sensation to be perceived as originating at the point of stimulation 4. Sensory adaptation: adjustment to a sensory stimulus over time B. Classification by stimulus location 1. Exteroceptors 2. Interoceptors C. Classification by nature of the stimulus 1. Mechanoreceptors: respond to mechanical deformation of the nerve receptor 2. Pain receptors (aka, nociceptors) 3. Thermoreceptors: respond to temperature stimuli 4. Chemoreceptors: respond to chemical stimuli 5. Photoreceptors: respond to light stimuli II. The general senses A. Tactile receptors: touch, pressure, vibration (e.g., Meissner’s and Pacinian corpuscles [aka, corpuscle of touch and lamellated corpuscle, respectively])
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Senses page 2 of 6 B. Baroreceptors: changes in pressures within a distensible organ (e.g., within a blood vessel wall) C. Proprioceptors: monitor position/location of joints and muscles; stimulus sent to cerebellum and parietal lobe of cerebrum D. Pain receptors a. Free nerve endings with a large receptive field b. Do not adapt c. Stimulus travels to the thalamus, and then to the cerebral cortex (parietal lobe) E. Thermoreceptors a. Cold vs. hot vs. cold/hot receptors b. Active during changing temperatures but quickly adapt to a stable temperature c. Stimulus travels to parietal lobe of cerebrum F. Chemoreceptors: detect changes in the concentration of specific chemical compounds (e.g., the carotid body monitors the concentration of CO 2 and O 2 in the blood) a. Sensory input goes to the brain stem, not to the cerebral cortex b. Responds to water- and lipid-soluble substances dissolved in the
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senses-outline - Senses page 1 of 6 ANAT 11110 Fall 2011...

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