USMLE Step 1 Neuroanatomy Review 25 18 Broca’s, Wernicke’s, Arcuate Fasciculus, Corpus Callosum

USMLE Step 1 Neuroanatomy Review 25 18 Broca’s, Wernicke’s, Arcuate Fasciculus, Corpus Callosum

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  • USMLE Audio Review files from our “Gold Standard USMLE Reviews”
  • Transcriptions of those files
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  • Following along with the transcription
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Play USMLE Audio MP3 25 18 Broca’s, Wernicke’s, Arcuate Fasciculus, Corpus Callosum Below

Begin 25 18 Broca’s, Wernicke’s, Arcuate Fasciculus, Corpus Callosum Transcription

A lesion to Broca’s speech area, these are areas 44 and 45 on the illustration, results in a type of motor aphasia. Student doctor, what are the characteristics of Broca’s aphasia. Broca’s aphasia, also referred to as motor aphasia, or expressive, or anterior aphasia is characterized by agrammatic, telegraphic speech with unimpaired comprehension.

Now, a lesion to Wernicke’s speech area results in Wernicke’s aphasia. Student doctor, what are the characteristics of Wernicke’s aphasia?

  • Wernicke’s aphasia is also referred to as sensory, receptive, fluent, and posterior aphasia. The speech of patients with Wernicke’s aphasia is fluent, but incoherent. These patients are unable to comprehend their own language or that of others.

Student doctor, what would be the result of a lesion to the arcuate fasciculus?

  • Conduction aphasia.

Spend a moment to explain conduction aphasia. In conduction aphasia, as can result from a lesion to the arcuate fasciculus, comprehension and speech production are not greatly affected. However, there is difficulty in repeating phrases.

Now, what would be the result of a lesion in the corpus callosum?

  • A lesion of the splenium causes left hemidyslexia.

****END OF TRANSCRIPTION****

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