USMLE STEP 1 Neurology Exam Practice Questions and Answers
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Course
USMLE
Institution
USMLE
USMLE STEP 1 Neurology Exam Practice
Questions and Answers
The notochord induces what to differentiate into what? - ANSWER-Induces overlying ECTODERM to
differentiate into NEUROECTODERM and form NUERAL PLATE
Neural plate then gives rise to? - ANSWER-Neural tube and neural crest cells
Notochord...
Holoprosencephaly - ANSWER✔✔-Failure of LEFT AND RIGHT HEMISPHERES TO SEPARATE
Usually occurs during the 5th and 6th week
May be related to mutations in the SONIC HEDGEHOG signaling pathway
Moderate form = Cleft lip/palate
Severe form = Cyclopia
Seen in:
1. PATAU SYNDROME
2. FETAL ALCOHOL SYNDROME
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