Which region of the lens vesicle forms the primary lens fibers?

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Multiple Choice

Which region of the lens vesicle forms the primary lens fibers?

Explanation:
Primary lens fibers come from the posterior cells of the lens vesicle. After the lens vesicle forms, these posterior cells elongate dramatically, move toward the center, and shed their nuclei and organelles to become long, tightly packed fibers. This fills the interior of the lens and establishes the main bulk of the tissue before birth. The anterior cells stay as the anterior lens epithelium, which continues to divide and produce secondary lens fibers over time. The lens capsule is a basement membrane secreted by the lens epithelium, not a region that forms fibers, and the corneal endothelium belongs to the cornea, not the lens.

Primary lens fibers come from the posterior cells of the lens vesicle. After the lens vesicle forms, these posterior cells elongate dramatically, move toward the center, and shed their nuclei and organelles to become long, tightly packed fibers. This fills the interior of the lens and establishes the main bulk of the tissue before birth. The anterior cells stay as the anterior lens epithelium, which continues to divide and produce secondary lens fibers over time. The lens capsule is a basement membrane secreted by the lens epithelium, not a region that forms fibers, and the corneal endothelium belongs to the cornea, not the lens.

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