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Chapter 12

Chapter 12

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Somatic sensory system somatic sensation-allows our body to feel, ache, chill and know what its parts are doing -is sensitive to many kinds of stimuli; pressure, position, distension of bladder, temperature of brain and limbs etc when stimuli become strong, somatic sensation also responsible for offensive but imp feeling: pain Somatic sensory systems is diff from other sensory system in 2 diff ways; 1)its receptors are distributed throughout the body vs being concentrated in small, specialized locations 2) it responds to many diff kinds of stimuli, i.e a group of 4 senses rather one single sense- --touch> temp. >pain and body position somatic sensory is a collective category for all sensations that are not seeing, hearing, smelling, tasting etc. a single receptor can encode stimulus features such as intensity, duration, position and sometimes direction but a single stimulus activates many receptors---> the CNS interprets the activity of vast receptor array and generates perceptions 1)Touch sensation of touch begins at the skin 2 major types of skin; hairy and glabrous(=hairless) skins outer layer: epidermis skins inner layer; dermis functions of skin: --protective function ---prevents evaporation of body fluids into the environment --provides direct contact withthe world skin - largest sensory organ we have -----is very sensitive Mechanoreceptors most of the sensory recpetors in skin are mechanoreceptors are sensitive to physical distortion such as streching and bending:) present thorugh out the body they monitor contact with skin and pressure in the heart and blood vessels, stretching of the digestive organ and urinary bladder and force against teeth contain unmyelianted axon branches, these axons have mechanosensitive ion channels:>gating depends on stretching or changes in tension of surrounding membrane Pacinian corpuscle : lies deep in the dermis largest receptor can be seen with naked eye Ruffinis endings: smaller than pacinian corpuscle found in both hairy and glabrous skin Meissners corpuscle-are located on the ridges of glabrous skin i.e on the tip of fingertips 110 SIZE OF pacinian corpuscles Merkels disks-located with in the epidermis consist of a nerve terminal and a flattened non neural epithelial cell www.notesolution.com
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