What is the ciliary cleft?

What is the ciliary cleft?

• A. The ciliary processes produce aqueous humor
• B. Trabecular meshwork near the iridocorneal angle
• C. The iris sphincter muscle
• D. The posterior chamber

Answer: (B)

The key idea is where the eye’s drainage pathway sits for aqueous humor. Aqueous humor is produced by the ciliary processes in the ciliary body, but its exit route is through the trabecular meshwork located at the iridocorneal angle—the conventional outflow pathway. This region, sometimes described as the ciliary cleft, is the funnel through which most fluid leaves the eye and enters Schlemm’s canal for eventual venous drainage. The iris sphincter is involved in pupil constriction, not drainage, and the posterior chamber is a compartment containing aqueous behind the iris, not the drainage site. So the ciliary cleft corresponds to the trabecular meshwork near the iridocorneal angle, the main route for aqueous outflow.

The key idea is where the eye’s drainage pathway sits for aqueous humor. Aqueous humor is produced by the ciliary processes in the ciliary body, but its exit route is through the trabecular meshwork located at the iridocorneal angle—the conventional outflow pathway. This region, sometimes described as the ciliary cleft, is the funnel through which most fluid leaves the eye and enters Schlemm’s canal for eventual venous drainage. The iris sphincter is involved in pupil constriction, not drainage, and the posterior chamber is a compartment containing aqueous behind the iris, not the drainage site. So the ciliary cleft corresponds to the trabecular meshwork near the iridocorneal angle, the main route for aqueous outflow.