Canal of Schlemm

Canal of Schlemm

The Canal of Schlemm or Schlemm's canal is a circular lymphatic-like vessel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream. It is named after the German anatomist, Friedrich Schlemm, who discovered it.

Structure

The Canal of Schlemm is located in the sclera, the white outer layer of the eye. It is situated near the limbus (the border between the cornea and the sclera) and is lined with endothelial cells. The canal is approximately 30 to 40 micrometers in diameter and is connected to the anterior chamber of the eye through a series of tiny pores known as trabecular meshwork.

Function

The primary function of the Canal of Schlemm is to drain the aqueous humor, a clear fluid that fills the anterior chamber of the eye, into the bloodstream. This process helps to maintain the correct intraocular pressure within the eye. The aqueous humor provides nutrients to the lens and the cornea, which do not have their own blood supply. It also contributes to the eye's optical power.

Clinical significance

Impaired or blocked drainage of aqueous humor through the Canal of Schlemm can lead to increased intraocular pressure, a condition known as glaucoma. This can damage the optic nerve and result in vision loss. Treatments for glaucoma aim to reduce intraocular pressure, often by improving the drainage of aqueous humor through the Canal of Schlemm.

See also

• Eye anatomy
• Aqueous humour
• Glaucoma
• Intraocular pressure
• Trabecular meshwork