Somatosensation

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Somatosensation

  1. 1. COME TO YOUR SENSES<br />Somatosensation<br />
  2. 2. Somatosensation<br />Somatosensation include awareness of touch, temperature, and pain. <br />There are several types of touch receptors, including Meissner’s corpuscles, Ruffini endings, Merkel’s disks, free nerve endings, and Pacinian corpuscles.<br />
  3. 3. Somatosensation<br />Meissner’scorpuscles respond to sudden displacements of the skin and low-frequency vibrations such as fluttering. <br />Ruffiniendings respond to stretch of the skin. <br />Merkel’sdisks respond to forces that occur at a tangent (angle) across the skin. <br />Free nerve endings respond to pain, warmth, and cold. <br />Paciniancorpuscles respond to sudden displacements of the skin and high-frequency vibrations. <br />
  4. 4. Somatosensation<br />Information about touch enters the brain through the cranial nerves (nerves in the head) and the spinal nerves (nerves below the head). <br />Each skin area that has particular nerves responding to touch is associated with a single spinal nerve called a dermatome. <br />The information about touch is sent along a very specific pathway to the brain.<br />
  5. 5. Somatosensation<br />When information about touch gets to the brain, the information goes first through the thalamus and is routed to the somatosensory cortex, located in the parietal lobe. <br />There are two strips in this area that respond mostly to touch and two strips that respond to deep pressure and movement of the joints and muscles. <br />
  6. 6. Somatosensation<br />Touch receptors in the skin<br />

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