Lecture 10 Special Senses 1

Lecture 10 Special Senses 1 - Special Senses Angela Black,...

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Special Senses Angela Black, DVM, PhD Department of Animal and Avian Sciences University of Maryland, College Park Fall 2010
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Special Senses Sensory receptors Touch Hearing Chemical Senses Olfaction Taste Vision
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Sensation The conscious perception of sensory stimuli. Receptors: Specialized neural cells React to specific aspect of internal or external environment “Translate” the stimuli into action potential
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Sensory Receptors Classified based on the specific type of stimulation to which they respond. Thermoreceptors: internal and external Mechanoreceptors: physical deformation Touch receptors in skin Stretch receptors – muscle Hair cells – inner ear, vestibular system Chemoreceptors: specific chemicals bind and generate an action potential Photoreceptors: eyes, pineal gland
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Thermoreceptors Cutaneous Sense Type of sensory nerve ending that “fire” in response to temperature changes. Bulbous Corpuscles In epidermis Note: there are also thermoreceptors internally (hyperthermia, hypothermia)
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Touch - Meniscoid nerve endings Pain - Free nerve endings Vibration - lamellar corpuscles Mechanoreceptors: Cutaneous Sense
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Mechanoreceptors Hearing and Vestibular System Ear Outer Middle Inner Vestibular system
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Anatomy of the Ear The ear has 3 main parts External ear Extends from the exterior to the tympanic membrane (eardrum) Middle ear An air-filled space within the temporal bone. Extends from the tympanic membrane to the oval window . Inner ear Housed entirely within the petrous temporal bone, forming an elaborate fluid-filled system of chambers and canals
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External Ear Auricle or Pinna The part of the ear visible on the outside of the head Varies considerably in shape and size between and within species Its size is dictated primarily by the shape
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This note was uploaded on 12/30/2011 for the course ANSC ANSC211 taught by Professor Black during the Fall '11 term at Maryland.

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Lecture 10 Special Senses 1 - Special Senses Angela Black,...

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