Special Senses:Topic 5-6
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Simplest receptors and common in epithelial tissue, responsible for sensation of itching
Free Nerve Endings
Small oval masses of flattened connective tissue cells in sheaths. 2 or more sensory fibers branch into each corpuscle and end within it as tiny knobs
Relatively large, ellipsoidal structures composed of connective tissue fibers and cells. Common in deeper dermal tissue of hands, feet, tendons.
Detect vibrations in tissue
Associated with changes at body surface. Include senses of touch, pressure, temp, and pain
Associated with changes in viscera
Associated with changes in muscles, tendons, and body position
Most sensitive to temps between 10-20. Temps below 10 stimulate pain receptors, producing freezing sensation
Most sensitive to temps above 25 and become unresponsive at temps above 45. Cause burning sensation
Myelinated, conduct nerve impulses rapidly at velocities of 30m per second. Associated with sharp pain. Seldom continues after pain producing stimulus stops
Acute Pain Fibers
Unmyelinated, conduct impulses more slowly at velocities up to 2m per second. Cause dull aching pain sensation that may be diff to pin point
Chronic Pain Fibers
Pain that feels as if its coming from some other body part other then part that's being stimulated
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