NeuroscienceLesson 2 of 5 in the course Sensory Systems

Somatosensory Receptors, Touch Precision, and Pain

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Somatosensation is the sensory system that provides information about touch, temperature, pain, and the position and movement of body parts. Its receptors are distributed across the body's exterior and in certain internal locations. Receptors in the skin and mucous membranes detect external stimuli, while receptors in muscles, joints, organs, and blood vessels monitor internal conditions.

All flashcards

Somatosensation
The sensory system that provides information about touch, temperature, pain, and body position and movement.
Free nerve ending
An unencapsulated sensory neuron ending that can detect pain, temperature, and light touch.
Receptive field
The region where stimulation can activate a particular sensory neuron.
Mechanically gated ion channels
Channels whose opening or closing changes in response to physical deformation, helping mechanoreceptors generate neural signals.
Proprioception
The sense of the position and movement of body parts.

Quiz questions

  1. How does a rapidly adapting sensory receptor typically respond to a sustained stimulus?Answer: It responds especially to changes in the stimulus and signals less during sustained stimulation.
  2. Which skin receptor is slowly adapting, unencapsulated, and useful for detecting edges and fine details?Answer: Merkel's disks.
  3. Which receptor detects changes in muscle length?Answer: A muscle spindle.
  4. Which statement distinguishes nociception from pain?Answer: Nociception is neural processing of potentially injurious stimuli; pain is a conscious experience.
  5. Where do most nociceptive signals entering the brain from the spinal cord project before further cortical processing?Answer: The thalamus.

Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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