The primary vitreous originates from which tissue?

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Prepare for the NBEO Human Development Exam with comprehensive quizzes and detailed explanations. Sharpen your understanding with multiple choice questions designed to mimic the real test. Get ready to succeed!

Multiple Choice

The primary vitreous originates from which tissue?

Explanation:
Embryonic (primary) vitreous comes from neural crest–derived mesenchyme that migrates into the developing eye and differentiates into the hyaloid/embryonic vitreous tissue. This tissue forms the initial gel-like vitreous and hosts the hyaloid vascular system during early development, including structures like the cloquet canal after the hyaloid vessels regress. The other tissues listed contribute to separate eye structures—retina from neural ectoderm, lens epithelium to the lens, and corneal stroma from neural crest–derived mesenchyme but not to the primary vitreous. Therefore, the origin is the hyaloid/embryonic vitreous tissue derived from neural crest/mesenchyme.

Embryonic (primary) vitreous comes from neural crest–derived mesenchyme that migrates into the developing eye and differentiates into the hyaloid/embryonic vitreous tissue. This tissue forms the initial gel-like vitreous and hosts the hyaloid vascular system during early development, including structures like the cloquet canal after the hyaloid vessels regress. The other tissues listed contribute to separate eye structures—retina from neural ectoderm, lens epithelium to the lens, and corneal stroma from neural crest–derived mesenchyme but not to the primary vitreous. Therefore, the origin is the hyaloid/embryonic vitreous tissue derived from neural crest/mesenchyme.

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