Zonule of Zinn

The zonule of Zinn (Zinn's membrane, ciliary zonule) is a ring of fibrous strands connecting the ciliary body with the crystalline lens of the eye. The zonular fibers hold the lens in place and function to change the focusing power of the eye by changing the tension of the fibers by contraction and relaxation of the ciliary muscle.

It should not be confused with the Anulus of Zinn, though it is named after the same person (Johann Gottfried Zinn).