Part 2: Dr. Steve I. Perlmutter Touch Temperature & Pain Proprioception Sensorimotor Neurophysiology of Active Sensing Somatosensory System Somatosensory System Receptor Function Spinal Cord Circuitry
Jan 03, 2016
Part 2: Dr. Steve I. Perlmutter
Touch
Temperature & Pain
Proprioception
Sensorimotor Neurophysiology of Active Sensing
Somatosensory SystemSomatosensory SystemReceptor Function Spinal Cord Circuitry
Ionic gradients generate a voltage across the membranes of neurons; membrane voltage is regulated by ionic channels and pumps
In primary sensory neurons, action potentials are elicitedby transduction of a sensory stimulus into a receptor potential
Receptorpotential
Spikegeneration
Spikeconduction
In mechanoreceptors, mechanical energy causes ionic channels in the cell’s membrane to open, leading to a change in membrane voltage, the receptor potential
Merkel receptors
Pacinian corpuscle
Touch acuity: receptive field size of receptors
Ruffini corpuscle
Meissner corpuscle
Axon branches toother CNS regions
Primary sensory afferents enter the spinal cord and project to 3 main targets
Information is transmitted from the primary sensory afferent to other neurons in the CNS at synapses.