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Download Chapter 15: Sensory, Motor, and Integrative Systems
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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 Senses vs. Special Senses Pain Temperature Light touch Pressure Sense of body and limb position Taste Smell Vision Hearing Balance • Mechanoreceptors • Thermoreceptors • Photoreceptors • Chemoreceptors • Nociceptors Unencapsulated vs Nerve Endings Free nerve endings Encapsulated Nerve Endings Naked nerve endings surrounded by one or more layers Pacinian corpuscle skin, bones, internal organs, joints Deeper tissue, muscles pain, light touch, and temperature Free Nerve Endings - Pain & Temperature Merkel’s Discs - Light Touch & Pressure Root Hair Plexuses - Light Touch 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) Muscle Spindles - Skeletal Muscle Stretching (Proprioception) Golgi Tendon Organs - Tendon Stretching (Proprioception) Somatic Pain-results from injuries to skin, muscle, joints, tendon vs. Visceral Pain- pain in body organs Referred Painfelt on the body surface hair shaft epidermis dermis subcutaneous fat hair follicle free nerve endings Krause’s End-Bulb Meissner’s corpuscles Pacinian corpuscles root hair plexus nerve Somatic Sensory Pathway Ascending Spinal Cord Tract Descending Spinal Cord Tract Primary Somatosensory Cortex & Primary Motor Area Primary Sensory Cortex Primary Motor Cortex
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