(WIP) Lecture 3: The Somatosensory System: Touch and Proprioception 2
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8 Terms
Dermatomes
The territory innervated by each spinal nerve
Maps of innervation arising from each dorsal root ganglion and its spinal nerve.
• Defined in patients suffering from shingles or after surgical interruption
• Individual differences
• Some overlap (more precise for pain)
• Helpful in determining area of spinal damage
Ia, Ib, II afferents
largest and fastest somatic afferents, supply sensory receptors to muscles for proprioception
Aβ afferents
smaller somatic afferents that convey touch
Aδ and C afferents
small and slow afferents that convey pain and temperature
Receptive fields
The area of skin surface over which stimulation results in a significant change in the rate of action potentials
Slowly adapting afferents
• Generate sustained discharge during ongoing stimulus
• Provide spatial info: size and shape of stimulus
Rapidly adapting afferents
• Fire rapidly when a stimulus is first presented
• Fall silent with continual stimulation
• Convey changes (stimulus movement)
Sensory transduction
Process of converting energy of stimulus into an electrical signal
Note 
Flashcards (41)