Ray-1

Question 1

Somatosensory receptors

Answer 1

• Classified by energy transduced
  
  • Mechanoreceptors
  • Thermoreceptors
  • Nociceptors (pain receptors)

Question 2

Mechanoreceptors

Answer 2

• Pacinian Corpuscle
• Meissner’s Corpuscle
• Ruffini Ending
• Merkel Cell

Question 3

Pacinian Corpuscle

Answer 3

Mechanoreceptor

• RA (rapidly adapting)
• AB
• Receptive Field size: Large
  
  • due to vibration sensitive
• responds to Contact; Vibration
  
  • acceleration points in skin indentation
• aka vibration detector

Question 4

Meissner’s Corpuscle

Answer 4

Mechanoreceptor

• RA
• AB
• Respond to: skin indentation
  
  • Contact
    
    • velocity changes (ramps of skin movement)
    • no responsse with steady indentation
  • flutter (slow vibration)
• Receptive Field: Small

Question 5

Ruffini Ending

Answer 5

Mechanoreceptor

• SA type II
• AB
• Respond to:
  
  • Both: velocity ramp (dynamic phase) and plateau (static phase) of skin indentation
    
    • Pressure (intensity)
    • Skin stretch
• Receptive field:
  
  • Large, stretch sensitive receptive field

Question 6

Merkel Cell

Answer 6

Mechanoreceptor

• SA type I
• AB
• Epithelial cell that has a synapse with the neuron
  
  • cannot produce action potentials
• Respond to:
  
  • Pressure
  • Texture
• Receptive Field: Small
• AKA pressure receptor