Skin Senses

Skin Senses - 1 Touch 2 Skin Senses Human skin is the...

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Unformatted text preview: 1 Touch 2 Skin Senses Human skin is the largest sensory organ (10-20 sq. ft.) and can be stimulated by a number of physical stimuli. 1. Mechanical 2. Thermal 3. Chemical 3 Skin Sensations Pins and needles Wetness Touch Smoothness Tickle Vibration Pressure 4 Distribution of Receptors Five different kinds of receptors are embedded in two layers of the skin. Some are close (epidermis) to the surface of the skin and others are deeper (dermis) in the skin. 5 Merkels Disks Merkels disks have small receptive fields with antagonistic surrounds making them responsive to edges and points (Braille characters). 6 Meissners Corpuscles Meissners corpuscles closer to epidermis have small receptive fields and respond to changes in stimuli giving information about texture. 7 Pacinian Corpuscles Pacinian corpuscles deep in the skin, respond to stimuli vibrating at 200Hz or more, giving texture information. 8 Ruffinis Corpuscles Ruffini Corpuscles are sensitive to stretching of skin when fingers and limbs are moved. 9 Summary Ruffinis Corpuscles (Stretch) Merkels Disk (Edges) Slow Adaptation Pacinian Corpuscles (Vibration) Meissner s Corpuscles (Texture) Rapid Adaptation Deep Receptor (Large RF) Surface Receptor (Small RF) 10...
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Skin Senses - 1 Touch 2 Skin Senses Human skin is the...

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