L27 Flashcards
what occurs when there is damage in the primary somatosensory cortex
creates deficits in proprioception and loss of ability to discriminate size, texture and shape of an object
what occurs when area 1 of SI is injured
impairs tactile discriminations
what happens when there is lesion or injury to area 2 of SI
impairment of the ability to recognize shapes and size of a grasped object
what other area goes with area 1
area 3b
what other area goes with area 2
area 3a
what area areas 3a and 3b
less complex areas of the processed versions of information found in areas 1 and 2
where do areas 3b & 1 as well as 3a and 2 send neurons to
sII, parietal lobe and motor areas
what is the posterior parietal lobe apart of
association cortex
what is the important role of the posterior parietal lobe
gets input from SI and integrates
area 5 - integrates tactile and proprioceptive information
area 7 - integrates visual information
large role in the guidance of movements
where does the integrated information from the posterior parietal lobe project to
motor areas
for the somatosensory map what areas reflect the greatest cortical space dedicated for sensory input
tongue, thumb, hand and face
plasticity and phantom limbs
areas that are not being used anymore, regions on either end of the homunculus will begin to take it over causing confusion
two reasons for phantom limb sensations
peripheral nervous system (damage and swelling of axon of nerve at site of amputation)
central nervous system (damage to pain fibers in SC or cortical reorganization)
phantom pain occurs because of
discrepancies between monitoring corollary discharge sent from motor centers, proprioceptive feedback, visual feedback and genetic scaffolding
future of prosthetic limbs
after amputation afferent and efferent pathways remain intact
- using prosthetic hands that contain proprioceptive and tactile sensor while a electrode is implanted into the nerves of the hand allow for sensor feedback
