Punctum

Punctum is a term used in anatomy to refer to a small, distinct point or spot. In the context of human anatomy, it is often used to describe the minute openings found on the surface of the body, such as the lacrimal punctum, which is the opening to the tear duct.

Lacrimal Punctum

The lacrimal punctum (plural: puncta lacrimalia) is a small hole located on the medial (nose-side) edge of each eyelid. It is the entry point for tears into the tear duct. Each eye has two puncta, one on the upper eyelid and one on the lower eyelid.

The lacrimal punctum leads into the lacrimal canaliculus, which in turn drains into the lacrimal sac. From there, tears flow down through the nasolacrimal duct and into the nasal cavity, which is why your nose runs when you cry.

Other Uses

In addition to the lacrimal punctum, the term punctum can also refer to other small openings or points in the body. For example, the punctum caecum is a small pit located in the retina of the eye.

See Also

• Lacrimal apparatus
• Tears
• Nasolacrimal duct

References

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