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BIO 365R-17-032508 - BIO 365R Main focus of last week...

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BIO 365R 03/25/08 Main focus of last week: pathway of sensory signals to the brain; pathway of signals from brain to spinal cord - sensory pathway 1. reflex channel – shortest from periphery nerve to spinal cord, fast reflex loop 2. cerebellar pathway – sensory info from mechanical sensor receptor to nuclei in medulla to cerebellum (necessary for all types of fine motor learning, needs high quality information) 3. lemniscal channel – culminates level of somatosensory cortex (mediates perception), has 3 sensory neurons (primary, secondary/cell body/medulla, tertiary thalamus to cortex) --------------------------------------------------------------------------------------------------------- - somatosensory homunculus – small surface areas needed to relay a signal; parts that are overrepresented at the expense of other parts; some parts are important for summation - two point discrimination threshold – minimum distance between two points where you are reliable-y able to discriminate between two points; fine discrimination in the periphery; long distance in the leg (where we can distinguish if we’re being touched by 1 point or two points)
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