Lacrimal punctum

Definition

The lacrimal punctum is a small opening on the inner corner of the eyelids that drains tears from the surface of the eye into the nasal cavity. It plays a crucial role in tear drainage and maintaining ocular surface health.

5 Must Know Facts For Your Next Test

1. Each eye has two lacrimal puncta, one on the upper eyelid and one on the lower eyelid.
2. Lacrimal puncta are part of the lacrimal apparatus, which includes structures involved in tear production and drainage.
3. Blockage or infection of the lacrimal punctum can lead to conditions like dacryocystitis or excessive tearing (epiphora).
4. Normal microbiota around the eye, including Staphylococcus species, can sometimes infect the lacrimal punctum if disrupted.
5. The function of lacrimal puncta is essential for preventing dry eyes by ensuring continuous tear drainage.

Review Questions

• What are the primary functions of the lacrimal punctum?
• How many lacrimal puncta are present in each eye, and where are they located?
• What types of conditions can arise from blockage or infection of the lacrimal punctum?

Related terms

Lacrimal Gland: A gland located above each eye that produces tears to lubricate the eye.

Dacryocystitis: An infection of the lacrimal sac, often due to blockage in the nasolacrimal duct.

Epiphora: A condition characterized by excessive tearing due to improper drainage through the lacrimal punctum.