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Lens

lens body (corpus centrale lentis)
annular pad (pulvinus annularis lentis)
fluid chamber (vesicula lentis)
lens capsule (capsula lentis)

Lens of a chicken embryo: detail 2

Lens fibers in the annular pad are radially arranged whereas in the lens body, fibers lie parallel to the optical axis. The annular pad and vesicula lentis form a hydrostatic mechanism for transmitting pressure from the ciliary processes to the lens body.

The lens is surrounded by a capsule (capsula lentis). The lens capsule is composed of thin collagen fibers embedded in an amorphous glycoprotein-matrix. In the anterior part, a simple cuboidal epithelium is present just underneath the capsule.