BIOL-2220 Lecture Notes - Lecture 4: Collagen, Muscle Spindle, Neurolemma

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Classified based on: type of stimuli they detect, location, structural complexity. Classify sensory receptors by structure, stimulus detected and body location. Stimulus type: mechanoreceptors: touch, pressure, vibration, and stretch, thermoreceptors: respond to temp changes, photoreceptors: respond to light (ex: retina, chemoreceptors: respond to chemicals in solution, nociceptors: respond to stimuli that result in pain. Location: exteroreceptors: respond to stimuli near or at the body surface, touch, pressure, pain, temp, and special senses. Itch receptor: dermis, small diameter, can feel if wearing wool. Merkel discs: lie in deepest layer of epidermis, light touch receptors. Hair follicle receptor: free nerve ending, light touch receptor for bending of hair: encapsulated nerve endings, consist of one or more fiber terminals of sensory neurons enclosed in a ct capsule, most are mechanoreceptors. Meissner"s corpuscles: tactile, small, few sensory terminals surrounded by schwann cells and by a thin ct capsule.

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