13_Senses

13_Senses - SENSES: GENERAL AND SPECIAL Chapter 19 Senses:...

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SENSES: GENERAL AND SPECIAL Chapter 19
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Senses: General and Special Conscious awareness of incoming sensory information is called sensation Stimuli are detected by receptors Two classes of receptors: General senses (temperature, pain, touch, stretch, and pressure) Special senses (gustation, olfaction, vision, equilibrium, and audition)
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Modality of Receptor Stimulus Chemoreceptors Detect chemical molecules Thermoreceptors Detect changes in temperatures Photoreceptors Detect changes in light Mechanoreceptors Detect mechanical changes like touch, vibration and stretch ex. Proprioceptors - Detect the position and the state of contraction of muscles Baroreceptors Detect changes in blood pressure within body structures Nociceptors Detect pain
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General Sense: Tactile Receptors Most numerous type of receptor Mechanoreceptors that react to touch, pressure, and vibration Located in the dermis and hypodermis
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Special Sense: Gustation Taste buds Microscopic chemoreceptors on tongue, posterior palate, cheeks, pharynx, epiglottis Papillae : macroscopic structures on tongue that may contain taste buds Filiform - anterior 2/3 tongue, no taste buds Fungiform - tip and sides of tongue, only few taste buds Vallate (Circumvallate) - back of tongue, largest, least numerous type, contain most taste buds Foliate - lateral tongue, used during infancy and early childhood
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Gustatory (taste) cell Supporting cell Basal cell Taste Bud Cytology Gustatory cells Chemoreceptor cells Replaced every 7-10 days Gustatory microvillus Taste hair
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This note was uploaded on 04/06/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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13_Senses - SENSES: GENERAL AND SPECIAL Chapter 19 Senses:...

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