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Review Question - QID 3324

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QID 3324 (Type "3324" in App Search)
Congenital unilateral transverse absence of the forearm results from vascular insult to which of the following?

Notochord

1%

16/1954

Endoderm

1%

19/1954

Limb bud mesoderm

39%

763/1954

Apical ectodermal ridge

58%

1135/1954

Epithelial ectoderm

1%

15/1954

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The apical ectodermal ridge lies directly over the fetal limb bud and directs longitudinal growth of the limb. Illustration A depicts proper limb development following the apical ectodermal ridge. Illustration B demonstrates transverse absence (also known as congenital amputation) following an insult to the apical ectodermal ridge. A vascular injury to the limb bud mesoderm or epithelial ectoderm may result in congenital deformity, but not a complete transverse absence of the limb.

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