somatosensory

• what 2 types of skin do humans have?

  hairy and glabrous- less follicles and more receptors
• what tests the difference in skin sensitivity?


  two point discrimination tes
• what is the most sensitive part of skin?

  fingertips- higher density
• what is nocioception?

  perceiving pain and temperature
• what is hapsis?

  perceiving fine touch and pressure
• what is proprioception?

  perceiving the location and movement of the body
• Nocioreceptors are free nerve endings, that when damaged release chemicals to produce an action potential
• Haptic receptors are dendrites attached to hair connective tissue or encased in tissue
• haptic receptors can distinguish between touch, pull, vibration, flutter and indentation
• movement stretches proprioceptors to mechanically stimulate them
• a rapidly acting receptor responds briefly to beginning and end of stimulus ie meissner's corpuscle
• a slowly adapting receptor responds as long as the stimulus is on the body eg merkel's disk
• types of receptors

  A) Meissners corpuscle

  B) Merkels receptor

  
• dorsal root ganglion
• dorsal root ganglion neuron

  • dendrite and axon are continuous to spinal cord
  • each spinal cord segment has a dorsal root ganglion with many neurons in
• what types of axons do proprioceptive/haptic neurons have?

  large very myelinated
• what axons do nocioceptive neurons have?

  small little/no myelination
• what is deafferentiation

  los of sensory input due to damage to sensory fibers