Mind Map Of Sensory Receptor Classification

CLASSIFICATION OF SENSORY RECEPTOR
MICROSCOPIC STRUCTURE
FREE NERVE ENDINGS
Bare dendrites associated with pain, thermal, tickle, itch, and some touch sensations.
ENCAPSULATED NERVE ENDINGS
Dendrites enclosed in connective tissue capsule for pressure, vibration, and some touch receptors.
SEPARATE CELLS
Receptors cells synapse with first-order sensory neurons; located in retina of eye (photoreceptors), inner ear (hair cells), and taste buds of tongue (gustatory receptor cells).
RECEPTOR LOCATION AND ACTIVATING STIMULI
EXTERORECEPTORS
Located at or near body surface; sensitive to stimuli originating outside body; provide information about external environment; convey visual, smell, taste, touch, pressure, vibration, thermal, and pain sensations.
INTERORECEPTORS
Located in blood vessels, visceral organs, and nervous system; provide information about internal environment; impulses usually are not comsciously perceived but occasionally may be felt as pain or pressure.
PROPRIOCEPTORS
Located in muscles, tendons, joints, and inner ear; provide information about body position, muscle length and tension, position and motion of joints, and equilibrium (balance).
TYPE OF STIMULUS DETECTED
MECHANORECEPTORS
THERMORECEPTORS
NOCICEPTORS
PHOTORECEPTORS
CHEMORECEPTORS
OSMORECEPTORS
Detect mechanical stimuli; provide sensations of touch, pressure, vibration, proprioception, and hearing and equilibrium; also monitor stretching of blood vessels and internal organs
Detect changes in temperature.
Respond to painful stimuli resulting from physical or chemical damage to tissue
Detect light that strikes the retina of eye.
Detect chemicals in mouth (taste), nose (smell), and body fluids.
Sense osmotic pressure of body fluids.
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