TAILIEUCHUNG - Chapter 027. Aphasia, Memory Loss, and Other Focal Cerebral Disorders (Part 5)

Conduction Aphasia Speech output is fluent but paraphasic, comprehension of spoken language is intact, and repetition is severely impaired. Naming and writing are also impaired. Reading aloud is impaired, but reading comprehension is preserved. The lesion sites spare Broca's and Wernicke's areas but may induce a functional disconnection between the two so that lexical representations formed in Wernicke's area and adjacent regions cannot be conveyed to Broca's area for assembly into corresponding articulatory patterns. Occasionally, a Wernicke's area lesion gives rise to a transient Wernicke's aphasia that rapidly resolves into a conduction aphasia. . | Chapter 027. Aphasia Memory Loss and Other Focal Cerebral Disorders Part 5 Conduction Aphasia Speech output is fluent but paraphasic comprehension of spoken language is intact and repetition is severely impaired. Naming and writing are also impaired. Reading aloud is impaired but reading comprehension is preserved. The lesion sites spare Broca s and Wernicke s areas but may induce a functional disconnection between the two so that lexical representations formed in Wernicke s area and adjacent regions cannot be conveyed to Broca s area for assembly into corresponding articulatory patterns. Occasionally a Wernicke s area lesion gives rise to a transient Wernicke s aphasia that rapidly resolves into a conduction aphasia. The paraphasic output in conduction aphasia interferes with the ability to express meaning but this deficit is not nearly as severe as the one displayed by patients with Wernicke s aphasia. Associated neurologic signs in conduction aphasia vary according to the primary lesion site. Nonfluent Transcortical Aphasia Transcortical Motor Aphasia The features are similar to Broca s aphasia but repetition is intact and agrammatism may be less pronounced. The neurologic examination may be otherwise intact but a right hemiparesis can also exist. The lesion site disconnects the intact language network from prefrontal areas of the brain and usually involves the anterior watershed zone between anterior and middle cerebral artery territories or the supplementary motor cortex in the territory of the anterior cerebral artery. Fluent Transcortical Aphasia Transcortical Sensory Aphasia Clinical features are similar to those of Wernicke s aphasia but repetition is intact. The lesion site disconnects the intact core of the language network from other temporoparietal association areas. Associated neurologic findings may include hemianopia. Cerebrovascular lesions . infarctions in the posterior watershed zone or neoplasms that involve the temporoparietal cortex .

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