The trabecular meshwork is a spongy, sieve-like band of connective tissue beams in the drainage angle of the eye. Aqueous humour filters through it into the canal of Schlemm. Its innermost and deepest part, the juxtacanalicular tissue, provides most of the resistance to outflow.
| Location | Iridocorneal angle, between Schwalbe line and the scleral spur, in front of the canal of Schlemm |
|---|---|
| Parts |
|
| Nerve Supply | Autonomic and sensory fibres from the ciliary nerves |
| Blood Supply | Avascular; supported by nearby anterior ciliary vessels |
Filters aqueous humour out of the anterior chamber and sets most of the resistance that determines intraocular pressure.
Increased resistance in the meshwork is the main cause of raised pressure in primary open-angle glaucoma. Laser trabeculoplasty treats the meshwork to improve drainage, and minimally invasive glaucoma surgery devices often bypass it into Schlemm canal. Pigment or exfoliation material can clog the meshwork and cause secondary glaucoma.
A chronic optic neuropathy usually linked to raised pressure from reduced meshwork outflow. It causes gradual, painless peripheral field loss.
Pigment rubbed off the back of the iris collects in the meshwork and blocks outflow, typically in young myopic men.
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