Zonules of Zinn

The Zonules of Zinn, also known as Zinn’s membrane and ciliary zonule, is a ring of fibrous strands connecting the ciliary body with the crystalline lens of the eye. The zonule of Zinn is split into two layers: a thin layer, which lines with the hyaloid fossa, and a thick layer, which is a collection of zonular fibers. Together, these fibers are known as the suspensory ligament of the lens.

When color granules are displaced from the Zonules of Zinn, by friction against the lens, the irises slowly fade. In some cases these color granules clog the channels and can lead to Glaucoma.

The Zonules of Zinn are named after German anatomist and botanist Johann Gottfried Zinn (1727-1759), whose book — Descriptio anatomica oculi humani — provided the first detailed comprehensive anatomy of the human eye.

Image Caption: Schematic diagram of the human eye in english. Credit: Rhcastilhos/Wikipedia