note 05 - visual and motor systems

27 views2 pages
Published on 13 Feb 2011
School
Department
Course
Professor
Lec 5
visual system anatomy
retina divided into two portions from middle
-nasal portion: retina near the nose
-temporal portion: retina away from the nose
optic nerve --> optic chiasm --> optic tract (nerves in CNS)
-nerves from temporal portion run to ipsilateral cortex while nerves from nasal portion go across
to contralateral cortex
-object from right visual filed will 'hit' Nasal portion of RIGHT eye and Temporal portion of
LEFT eye, then info of the object will reach to Left visual cortex
-primary visual cortex(17): receive info from eyes
-associational visual cortex: recognize objects faces ...
problems of visual info transmission
optic nerve damage--
-nomocular blindness: damage of one eye, lose vision from that eye
-bitemporal hemianopia: damage of optic chiasm (nerves from nasal), lose two lateral Visual field
primary cortex damage (info receiving problems)--
-partial occipital cortex damage of one side causes blindness on opposite visual field
-macular sparing: complete damage of one side cortex causes b lindness on opposite visual field
except center spot
associational cortex damage (higher order problems)--
-visual agnosia: inability to recognize what objects are
-prosopagnosia: inability to recognize/distinguish FACES and other comlex visual stimuli (damage
in area 18&19 )
-color agnosia: color seems less intense to patients after stroke (bilateral damage of occipital
temporal region)
somatosensory system problem
(recall: primary sensory cortex - postcentral gyrus)
-influence sensory threshold
-stereognosis: impairment of judging shapes of objects using hands, locating spatial objects
(especially patients' own limbs)
motor system problem
-generally involves primary mortor cortex (precentral gyrus) damage
-severe stroke can damage motor cortex
-f lacid paralysis(limbs hang down) may turn to hypertonic paralysis(rigid limbs) within few
days/weeks
-mild stroke disrupt fine motor movement (particularly fingers move)
-apraxia: inability to perform appropriate complex movement with objects
Parkinson's disease--
-common among 60-70y but does affect young people
www.notesolution.com
Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

Document Summary

Lec 5 visual system anatomy retina divided into two portions from middle. Temporal portion: retina away from the nose optic nerve --> optic chiasm --> optic tract (nerves in cns) Nerves from temporal portion run to ipsilateral cortex while nerves from nasal portion go across to contralateral cortex. Object from right visual filed will "hit" nasal portion of right eye and temporal portion of. Left eye, then info of the object will reach to left visual cortex. Associational visual cortex: recognize objects faces problems of visual info transmission optic nerve damage-- Nomocular blindness: damage of one eye, lose vision from that eye. Bitemporal hemianopia: damage of optic chiasm (nerves from nasal), lose two lateral visual field primary cortex damage (info receiving problems)-- Partial occipital cortex damage of one side causes blindness on opposite visual field. Macular sparing: complete damage of one side cortex causes blindness on opposite visual field except center spot associational cortex damage (higher order problems)--

Get OneClass Grade+

Unlimited access to all notes and study guides.

YearlyMost Popular
75% OFF
$9.98/m
Monthly
$39.98/m
Single doc
$39.98

or

You will be charged $119.76 upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.