III3 - - skin, muscles, joints i. superficial -skin ii....

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Sensory Receptors and Special Senses III. Classification of General Senses A. Cutaneous (Skin) Senses 1. tactile (touch) a. light touch - location not perceived b. discriminative touch - location perceived c. Merkel's discs - discriminative touch d. Meissner's corpuscle - discriminative touch e. organs of Ruffini - deep, continuous touch 2. pressure a. felt over a large area than touch, deeper b. Pacinian corpuscle - lower layer of dermis 3. vibration a. detect high and low frequency vibrations 4. thermosensation a. respond to hot/cold; may be free nerve endings 5. pain (nociception) a. acute pain - very quick, not felt in deep areas b. chronic pain - longer lasting, gradual increase c. somatic pain
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Unformatted text preview: - skin, muscles, joints i. superficial -skin ii. deep - muscle, joint, tendon, fascia d. visceral pain- from receptors in organs e. referred pain- projected to skin above organ B. Proprioceptive (kinesthetic) Sense 1. function - position of limbs/body and equilibrium 2. muscle spindles a. intrafusal fibers- inner muscle fibers i. type Ia sensory fiber - in center ii. type II sensory fiber - at ends iii. gamma motor neurons - from ventral horn b. extrafusal fibers- outer muscle fibers i. alpha motor neurons - form ventral horn 3. Golgi (tendon) organs a. at junction of tendon and muscle 4. Joint Kinesthetic receptors a. within/around synovial joints...
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This note was uploaded on 01/29/2012 for the course SCIE SYG2000 taught by Professor Bernhardt during the Fall '10 term at Broward College.

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