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Sensory, Motor, & Integrative System

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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Sensory, Motor, & Integrative System

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  1. Sensory, Motor, & Integrative System Ch 15

  2. Sensation: • The conscious or subconscious awareness of external or internal stimuli. • Perception: • The conscious awareness and the interpretation of meaning of sensations.

  3. General Sensesvs. Special Senses Taste Smell Vision Hearing Balance Pain Temperature Light touch Pressure Sense of body and limb position

  4. Sensory Receptors • Mechanoreceptors • Thermoreceptors • Photoreceptors • Chemoreceptors • Nociceptors

  5. 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

  6. Unencapsulated Nerve Endings Free Nerve Endings- Pain & Temperature Merkel’s Discs - Light Touch & Pressure Root Hair Plexuses - Light Touch pain, light touch, and temperature

  7. 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)

  8. Encapsulated Nerve Endings Muscle Spindles - Skeletal Muscle Stretching (Proprioception) Golgi Tendon Organs - Tendon Stretching (Proprioception)

  9. Pain- protective function Somatic Pain-results from injuries to skin, muscle, joints, tendon vs.Visceral Pain- pain in body organs

  10. Referred Pain-felt on the body surface

  11. hair shaft epidermis dermis subcutaneous fat hair follicle Skin

  12. Skin Receptors free nerve endings Krause’s End-Bulb Meissner’s corpuscles Pacinian corpuscles root hair plexus nerve

  13. Somatic Sensory Pathway

  14. Ascending Spinal Cord Tract

  15. Descending Spinal Cord Tract

  16. Primary Somatosensory Cortex & Primary Motor Area

  17. Primary Sensory Cortex

  18. Primary Motor Cortex

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