KIN110 Lecture Notes - Lecture 15: Postcentral Gyrus, Dermis, Sensory Neuron

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Comprised of sensory (afferent) and motor (efferent) divisions. Can sub-divide the motor system into somatic (conscious control) and autonomic. Autonomic subdivides into sympathetic (ex. speeds up heart) and parasympathetic (ex. slows down heart) General principle of sensory receptors respond to environmental changes (stimuli) Leads to graded potentials => action potential/nerve impulses along afferent nerves =>cns (brain) Mechanical force (touch, pressure, vibration, stretch) thermoreceptors. Sensory receptor classi cation: location exteroreceptors at/ near body surface. Touch, pressure, pain, temperature, vision, hearing, taste, smell etc. Chemical change, temperature, pain, discomfort, thirst, hunger, etc. Housed in complex sense organs, eg. eyes. Tactile (touch, pressure, stretch, vibration) temperature monitoring, pain. One receptor/many stimuli and different receptors/same stimulus. Dermal papillae of hairless skin, particularly nipples, external genitalia, ngertips, soles of feet, eyelids. Muscle spindles: very important, keep you from falling over. Sensory integration: the somatosensory system sensation awareness of internal/external environment perception conscious interpretation of stimuli. Somatosensory system three levels of neural integration via

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