Flow of Aqueous Humor

This anterolateral view of the eye shows the ciliary body and the iris. Note the ciliary processes: this is where the suspensory ligament is attached (not seen in this preparation). There are two types of muscles in the iris. The papillary sphincter muscle near the pupillary border of the iris constricts pupil and is under parasympathetic control. The radially arranged papillary dilator muscle, on the other hand, opens the pupil and is under sympathetic control. Aqueous humor is produced by the epithelium of the ciliary body. It is secreted into the posterior chamber, from which it flows through the pupil to enter the anterior chamber. The aqueous humor is drained into the canal of Schlemm, which is a venous sinus found near the limbus.