EXERCISE 23 – GENERAL SENSATION OBJECTIVES 1. To describe the function and location of various types of general sensory receptors. 2. To define exteroceptor, interoceptor, and proprioceptor . 3. To demonstrate the density and distribution of tactile and thermoreceptors in the skin. 4. To define adaptation and negative afterimage . 5. To define referred pain and projection . NOTES: I. Types of sensory receptors on the basis of location: exteroceptor/interoceptor/proprioceptor Define and give examples of each type. II. Types of general sensory receptors on the basis of stimulus: Tactile receptors (touch and pressure): • hair root plexuses in skin • Merkel disc in skin • Meissner’s corpuscle in the skin • Pacinian’s corpuscle in the skin • Ruffini’s corpuscle in the skin • Krause’s corpuscle in lips, tongue, and genitals Thermoreceptors • free nerve endings in the skin Pain receptors • free nerve endings in the body Proprioceptors (muscle length and tension)
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