Punctum
Punctum
Punctum (pronunciation: /ˈpʌŋktəm/), is a term used in various fields of medicine. The etymology of the word is Latin, where it means "point" or "dot".
In Ophthalmology
In Ophthalmology, punctum refers to the punctum lacrimale, the point of the inner corner of the eye where tears drain. It is also known as the tear duct.
In Dermatology
In Dermatology, punctum is a term used to describe a small, raised, solid pimple or swelling, often forming part of a rash. It is also the opening in the skin from which the hair grows.
In Anatomy
In Anatomy, punctum is a term used to describe a small, distinct point on the body. For example, the punctum proximum and punctum remotum are used in ophthalmology to describe the nearest and farthest points at which an object can be clearly seen without strain.
Related Terms
- Punctum Caecum: A small blind spot in the retina where the optic nerve enters the eye.
- Punctum Proximum: The nearest point at which an object can be clearly seen without strain.
- Punctum Remotum: The farthest point at which an object can be clearly seen without strain.
See Also
External links
- Medical encyclopedia article on Punctum
- Wikipedia's article - Punctum
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