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There are numerous types of abnormal development of the human brain. For each term listed, select the appropriate alternative from the list below.
-lissencephaly ___
A)aborted cell migration of gray matter
B)absence of cerebral hemispheres, diencephalon, and midbrain
C)failure to form sulci and gyri
D)single undifferentiated hemisphere

Question

Quizplus · Accepted Answer

Lissencephaly is a condition where the brain lacks normal convolutions (sulci and gyri) due to a failure in the migration of neurons to the correct location during development.

Answer: A 
 Aborted cell migration of gray matter is characteristic of lissencephaly, where neurons fail to migrate to the correct location during development, resulting in an abnormally smooth brain surface.

Answer: B 
 Absence of cerebral hemispheres, diencephalon, and midbrain is an extreme form of abnormal brain development, known as anencephaly. Lissencephaly is not associated with the complete absence of any major brain structures.

Answer: D 
 Single undifferentiated hemisphere is a rare malformation called hemimegalencephaly, which results from an overgrowth of one hemisphere of the brain. This is not characteristic of lissencephaly.

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