BCS 151 Lecture Notes - Lecture 19: Lamellar Corpuscle, Bulbous Corpuscle, Mechanoreceptor
23 Nov 2016
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Document Summary
Ian waterman loss of touch and proprioception: no control from the neck down, caused by a viral infection. Touch indicates where our body is in the world and what it is doing. Has an important social quality: it is how we interact with those around us. Skin: largest organ of the body both by weight and surface area. 16% of your total body weight: has many purposes. Serves as a barrier to the environment. Protects us from water loss, friction and wounds. Uses specialized pigment cells to protect us from ultraviolet rays. Produces vitamin d in the epidermal layer when exposed to sun rays. Discriminative touch using our fingers to feel: our perception of pressure, vibration and texture, mediated by 4 mechanoreceptors, types of fibers. Rapidly adapting (ra) responds to changes in stimulation, but not to constant stimulation. Slowly adapting (sa) responds to constant stimulation. Punctate small receptive fields with distinct boundaries. Diffuse large receptive fields with non-distinct boundaries.
