diminished sensitivity of a receptor to continued stimulation
neurologic state in which painful stimuli are no longer perceived as being painful
loss of touch and pain sensation either from a cortical lesion or from a drug-induced state of suppressed sensation
surgical sectioning of tracts in the spinal cord, usually employed to control medically intractable pain
Encapsulated Tip Endings
ovoid fluid-filled receptors with multiple layers. Highly sensitive to deformation.
Fine discriminative touch. Includes two-point touch, stereognosis, and graphesthesia
Expanded tip endings
receptors with expanded tips. Slow-transmitting and moderately adapting mechanoreceptors.
Free Nerve Endings
small and slowly conducting mechanorecptors. Associated with pain and temperature
discriminative sensory ability used to recognize the outline of letters, words or symbols written on the skin surface
internal awareness of the range and direction of limb movements
internal awareness of position, posture and movement
primitive sensory system that includes pain, temperature, and crude touch
the sensation of pain from a visceral organ is sensed as originating from another body part. The explanation for this false localization is that the visceral structures do not have separate afferent pathways, rather they synapse on the same neurons in the dorsal root ganglion that also receives somatic sensation from the superficial structures.
nerve endings that respond to environmental changes by producing receptor (graded) potentials
small projection to the cerebellum mediating unconscious proprioception from the lower and upper limbs
ascending bundle of fibers that mediate the sensation of pain, touch and temperature from the spinal cord to the thalamus
identification of objects by tactual sensation of shape, texture, and size
related to the sense of touch
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