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Sensory, Motor, & Integrative System. Ch 15. Sensation: The conscious or subconscious awareness of external or internal stimuli. Perception: The conscious awareness and the interpretation of meaning of sensations. General Senses vs. Special Senses. Taste Smell Vision Hearing Balance.
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Sensation: • The conscious or subconscious awareness of external or internal stimuli. • Perception: • The conscious awareness and the interpretation of meaning of sensations.
General Sensesvs. Special Senses Taste Smell Vision Hearing Balance Pain Temperature Light touch Pressure Sense of body and limb position
Sensory Receptors • Mechanoreceptors • Thermoreceptors • Photoreceptors • Chemoreceptors • Nociceptors
General Senses Unencapsulated Nerve Endings Encapsulated Nerve Endings vs Naked nerve endings surrounded by one or more layers Free nerve endings Pacinian corpuscle skin, bones, internal organs, joints Deeper tissue, muscles
Unencapsulated Nerve Endings Free Nerve Endings- Pain & Temperature Merkel’s Discs - Light Touch & Pressure Root Hair Plexuses - Light Touch pain, light touch, and temperature
Encapsulated Nerve Endings Pacinian Corpuscles - Deep Pressure Meissner’s Corpuscles - Discriminative Touch in Hairless Skin Areas Krause’s End-Bulbs - Discriminative Touch in Mucous Membranes Ruffini’s Corpuscles - Deep Pressure & Stretch (Proprioception)
Encapsulated Nerve Endings Muscle Spindles - Skeletal Muscle Stretching (Proprioception) Golgi Tendon Organs - Tendon Stretching (Proprioception)
Pain- protective function Somatic Pain-results from injuries to skin, muscle, joints, tendon vs.Visceral Pain- pain in body organs
hair shaft epidermis dermis subcutaneous fat hair follicle Skin
Skin Receptors free nerve endings Krause’s End-Bulb Meissner’s corpuscles Pacinian corpuscles root hair plexus nerve