SAMUEL YOO by Samuel Yoo

Touch & Pressure Senses

swyoo22 — 2014-12-16 18:43:48 UTC

The senses of touch & pressure derive from 3 types of receptors. These receptors sense mechanical forces that deform or displace tissues.

swyoo22 — 2014-12-16 18:45:03 UTC

1. Free Nerve Endings 2. Tactile Corpuscles 3. Lamellated Corpuscles

swyoo22 — 2014-12-16 18:45:49 UTC

swyoo22 — 2014-12-16 18:50:21 UTC

Free Nerve Endings:

swyoo22 — 2014-12-16 18:52:46 UTC

•Simplest receptors

•Common in epithelial tissues

•Responsible for the sensation of itching

Tactile Corpuscles:

swyoo22 — 2014-12-16 18:53:40 UTC

•Small, oval masses of flattened connective tissue cells in connective tissue sheaths

•2 or more sensory nerve fibers branch into each corpuscle and end within it as tiny knobs

•Abundant in the hairless portions of skin (lips/fingertips/palms/soles/nipples/external genital organs)

•Provide fine touch, such as distinguishing two points on the skin where an object touches, to judge its texture

Lamellated Corpuscles:

swyoo22 — 2014-12-16 18:54:32 UTC

•Relatively large, ellipsoidal structures composed of connective tissue fibers and cells •Common in the deeper dermal tissue of the hands, feet, penis, clitoris, urethra, and breasts and also in tendons of muscles and ligaments of joints •Stimulated by heavier pressure and stretching •Detect vibrations in tissues