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Upload-P431-Chapter 14 (1) - Chapter 14 The parietal lobe...

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Unformatted text preview: Chapter 14: The parietal lobe Chapter I. II. III. IV. Anatomy Theories of function Symptoms of parietal damages Clinical neuropsychological assessment I. Anatomy I. Lateral surface: central fissure, Sylvian fissure. Sylvian Medial surface: parietal – occipital sulcus. Postcentral gyrus (Brodmann’s areas 1, 2, 3). Angular gyrus (Brodmann’s area 39). Two Zone: Two Anterior zone including postcentral gyrus. Anterior Posterior zone including angular gyrus. II. Theories of function II. A. Anterior Zone: concerned with somatic A. sensations and perceptions; involved in stereognosis – the ability to perceive objects through sense of touch. through B. Posterior Zone: specialized for integrating somatic, visual, auditory inputs; involved in visual perception of location. III. Symptoms of parietal damages III. A. Damage to the anterior zone. Marked changes in somatosensory threshold. Afferent paresis: clumsy fingers due to Afferent lesions to the postcentral gyrus. lesions Astereognosis: an inability to identify objects Astereognosis: by touch. by Asomatognosia: the failure to recognize parts Asomatognosia: of one’s own body. of B. Damage to the posterior zone B. Balint’s syndrome: due to damage to the superior Balint’s parietal region; patients show optic ataxia, ocular apraxia, simultagnosia. apraxia, Contralateral neglect: due to damage to the right Contralateral inferior parietal region; patients neglect part of the body or space contralateral to the lesion. body Gerstmann syndrome: due to damage to the Gerstmann left parietal region; including finger agnosia, right-left confusion, agraphia, and aculculia. right-left Apraxia: due to damage to the left inferior Apraxia: parietal cortex; inability to make voluntary movements movements Ideomotor apraxia: inability to copy Ideomotor movements or to make gestures Constructional apraxia: inability to assemble Constructional objects. objects. IV. Clinical neuropsychological assessment A. Two-point discrimination: somatosensory A. threshold. threshold. B. Seguin-Goddard form board: tactile form B. recognition. recognition. C. Line bisection: contralateral neglect. D. Mooney Closure and Gollin Incomplete Figures: D. visual perception capacity. visual E. Right-Left differentiation: ability to perceive E. spatial relations. spatial F. Token: language comprehension. G. Kimura Box: apraxia. ...
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