CSCD 3235 Chapter Notes - Chapter 12: Somatotopic Arrangement, Neuroplasticity, Dermis
6 Apr 2017
School
Department
Course
Professor
Document Summary
Somatic sensation: sensation from the skin, muscles, bones, tendons and joints. Initiated due to activation of a number of distinct somatic receptors that respond specifically to changes in temperature, touch, pressure, limb position/movement, or pain. Thi(cid:272)k epider(cid:373)is, s(cid:449)eat gla(cid:374)ds, meiss(cid:374)er"s (cid:272)orpus(cid:272)les, higher receptor density. Hairy skin, thin epidermis, sebaceous glands (hair oil), hairy follicle receptors, ruffini endings, lower receptor density. Mechanoreceptors: sensory receptor that responds to mechanical pressure or distortion. Meiss(cid:374)er"s corpuscle: (aka) tactile corpuscles, responsible for sensitivity of light touch. Highest sensitivity (lowest threshold) when sensing vibrations between 10 and 50 hz. Rapidly adaptive receptors, most concentrated in thick, hairless skin, especially at the finger pads and lips. Merkel"s (cid:374)erve e(cid:374)di(cid:374)gs: found in the basal epidermis and hair follicles, classified as slowly adapting. Provide information on pressure, position, and deep static touch features such as shapes and edges. In burns, merkel endings are most commonly lost.
