2020–2021 BCSC Basic and Clinical Science Course™
11 Lens and Cataract
Chapter 4: Embryology and Developmental Defects
Normal Development of the Lens
The Zonule of Zinn
Experimental evidence suggests that the zonular fibers are secreted by the ciliary epithelium, although how these fibers insert into the lens capsule is not known. The zonular fibers begin to develop at the end of the third month of gestation.
Figure 4-3 Components of the tunica vasculosa lentis.
(Illustration by Christine Gralapp.)
Excerpted from BCSC 2020-2021 series: Section 11 - Lens and Cataract. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.