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Mechanoreception. Balance & Acceleration (equilibrioception) Body Awareness (proprioception) Internal Stretch Receptors (ex. bladder, blood vessels) Internal Touch/Pressure Receptors (ex. pharynx) Thermoreception Cutaneous Mechanoreceptors Nocioceptors. Diverse.

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mechanoreception
Mechanoreception
  • Balance & Acceleration (equilibrioception)
  • Body Awareness (proprioception)
  • Internal Stretch Receptors (ex. bladder, blood vessels)
  • Internal Touch/Pressure Receptors (ex. pharynx)
  • Thermoreception
  • Cutaneous Mechanoreceptors
  • Nocioceptors

Diverse

slide2

Cutaneous Mechanoreceptor Types

Pacinian Corpuscle

Hair Follicle Receptor

Merkel’s Disk

Ruffini Ending

Mechanical Displacement

slide3

Hair follice receptors.

  • Light Touch – Meissner’s Corpuscle
  • Strong Pressure – Merkel’s Disk
  • Pain – Nociceptors
  • Heat/Cold – Thermoreceptors, some Nociceptors
nociception
Nociception
  • Primarily detect pain.
  • ‘Free Nerve Endings’, ‘Wide Dynamic Range receptors’
  • Only known polymodal receptors. Also receive:
    • Hot, cold
    • Warm, cool (similar receptors, distinct pathways)
    • Chemoreception
  • Complicated.
    • Many exceptions.
    • Poorly understood.
pacinian corpuscles
Pacinian Corpuscles
  • In joints, organs.
  • Rapidly adapting – responds briefly to begining and end of stimulus
  • Detects: pressure change, esp. vibrations
    • Up to centimeters away
  • Responds best to sinusoidal vibrations w/ narrow frequency range.
    • ~Low pass filter
    • Result of onion-shaped structure
meissner s corpuscles
Meissner’s Corpuscles
  • Highly concentrated in areas sensitive to light touch.
    • Fingertips, lips, tongue, soles, genitals
  • Located: surface of the skin
      •  highly sensitive
      •  Limited. Must physically be touching.
merkel s disk
Merkel’s Disk
  • Slow adaption because of rigid structure.
    • Sustainable response – 30 min. in humans
    • Irregular firing in sustained.
  • Large receptive field.
    • Small, sharp pressure: fast firing rate.
    • Large, flat pressure: slow rate
  • Located in hairless skin and in hair follices.
    • Not in skin surrounding follicle.
ruffini ending
Ruffini Ending
  • Only in glabrous skin
  • Sensitive to skin streching.
  • Contributes to fine motor control.
    • Contributes significantly to finger positioning.
mechanosensory homunculus
Mechanosensory ‘Homunculus’

Somatosensory area of human cortex:

Postcentral Gyrus of Parietal Lobe

  • ‘Topographic map’ of skin receptors.
  • Size of area ~ # of receptors

Receives projections from:

Skin receptors  spinal nerve

Face / Mouth  trigeminal nerve