01:830:331 Lecture Notes - Lecture 30: Glabrousness, Proprioception, Mechanoreceptor
24 Jul 2016
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~there are cutaneous sense that tell you about touch. ~touch is unique in that there are receptors for it all over the body. ~respond to variety of stimuli pressure, vibration, temperature, harmful mechanical force. ~kinesthesia = body movement, detected by stretch receptors in muscles. ~proprioception = sense of one"s position in space. ~hairy skin has unencapsulated nerve endings (free), also in the deep tissue. ~glabrous skin has encapsulated nerve endings (in addition to the free ones) Meissner"s corpuscles in papillae of dermis, rapidly adapting, respond to low frequency vibration. Merkel"s disks in epidermis, slowly adapting, respond to indentation/constant pressure. ~there are carbohydrate chains (spindles) attached to the edges of the intercalated proteins. ~pushing down on skin tissue pulls these chains apart and the ion channels get opened up. ~the axons for somatosensory receptors enter spinal cord through spinal nerves. ~cell bodies are in dorsal root ganglion (for body) or cranial nerve ganglia (for head)
