For the following types of aphasia, what are the characteristics, location of injury, and blood vessel that results in the aphasia:
1. Wernicke's?
2. Broca's?
3. Global aphasia?
4. Anomia?
5. Conduction aphasia?
6. Transcortical motor?
7. Transcortical sensory?
Answers:
1. Fluent speech, alexia, agraphia, marked paraphasias. Located in postero-superior temporal gyrus of dominent hemisphere. Caused by lesion of inferior division of the MCA.
2. Nonfluent speech, preserved comprehension. Located in postero-inferior frontal lobe. Caused by lesion of superior division of the MCA.
3. Poor comprehension and repetition, incomprehensible speech or mutism. Located in the entire perisylvian region. Caused by MCA lesion.
4. Word-finding difficulty, alexia, agraphia. Located in angular gyrus. Caused by a lesion affecting the temporo-parietal region.
5. Impaired repetition, literal paraphasias (substituting similar sounds). Located in arcuate fasciculus, which joins Broca's and Wernicke's areas.
6. Reduced rate of speech and output, initiation, good comprehension and repetition. Located in frontal lobe, ant/sup to Broca's area. Caused by an ACA lesion.
7. Poor comprehension, fluent speech, preserved repetition. Located in watershed area isolating perisylvian speech structures from the posterior brain. Caused by PCA lesion.
Sunday, June 29, 2008
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