Lacrimal duct

Lacrimal duct

The lacrimal duct also known as the nasolacrimal duct is a part of the lacrimal apparatus in the human anatomy. It is responsible for the drainage of the tears and other secretions from the eye to the nasal cavity.

Structure

The lacrimal duct is a thin, tube-like structure that starts from the lacrimal sac located at the medial canthus of the eye. It extends downwards and slightly backwards into the inferior nasal meatus of the nasal cavity. The duct is approximately 12 mm in length and is lined by a columnar epithelium.

Function

The primary function of the lacrimal duct is to drain the tears produced by the lacrimal gland from the eye to the nasal cavity. This is why when we cry, we often have a runny nose. The duct also helps in the removal of any debris or foreign particles that may have entered the eye.

Clinical significance

Blockage of the lacrimal duct, known as dacryocystitis, can lead to persistent tearing, discharge, and sometimes painful swelling near the inside corner of the eye. Treatment usually involves antibiotics and sometimes surgical intervention.

See also

• Lacrimal apparatus
• Lacrimal gland
• Lacrimal sac
• Dacryocystitis