The aqueous humor is secreted by the ciliary processes in the posterior chamber of the eye.

The swimbladder has two elongate posterior chambers.

It is located in the anterior and posterior chambers of the eye, the space between the lens and the cornea.

A ductus communicans is a constriction of a swim bladder between the anterior and posterior chambers.

The posterior chamber should not be confused with the vitreous chamber.

The aqueous is secreted by the ciliary body into the posterior chamber between the iris and lens.

Instead, it stays only in the anterior segment, which is divided into the anterior and posterior chambers.

When the ciliary bodies produce the aqueous humor, it first flows into the posterior chamber (bounded by the lens and the iris).

The posterior chamber extends along the whole length of the body and is used in buoyancy.

It is then inserted and placed in the posterior chamber in the capsular bag (in-the-bag implantation).