Punctum

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Punctum, plural puncta, adjective punctate, is an anatomical term that refers to a sharp point or tip. It may also refer to:

Medical
  • Lacrimal punctum, one in each eyelid, commence at minute orifices, termed puncta lacrimalia, collect tears produced by the lacrimal glands
  • Blind spot (vision), punctum cecum, the blind spot in human vision corresponding to the location of the optic disk
  • Erb's point (neurology), punctum nervosum, in humans, a site at the lateral root of the brachial plexus located 2–3 cm above the clavicle
  • Imperforate lacrimal punctum, a congenital disorder of dogs involving the lack of an opening to the nasolacrimal duct (tear duct) in the conjunctiva
Other
  • Punctum delens, typographic marks used to indicate deletion, can be a small point, an X or a strike-through
  • Neume, the basic element of Western and Eastern systems of musical notation prior to the invention of five-line staff notation
  • Equant, punctum aequans, is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of heavenly bodies
  • in Camera Lucida (book), studium and punctum
Landsnails in genus Punctum
  • Punctum (gastropod), a genus of land snails
  • Punctum blandianum, a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Punctidae
  • Punctum minutissimum, a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Punctidae
  • Punctum pygmaeum, a species of very small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Punctidae
  • Punctum randolphi, a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Punctidae
Unrelated species named punctum
  • Allium punctum, dotted onion, a species of wild onion, native to the western United States in and around
  • Amyna punctum, a moth of the Noctuidae family, found throughout subtropical Africa and Australasia
  • Cinguloterebra punctum, a species of sea snail, a marine gastropod mollusk in the family Terebridae, the auger snails
  • Phylloxiphia punctum, a moth of the Sphingidae family, found in the savanna of Southeast Africa
  • Sepsis punctum, a European species of fly and a member of the family Sepsidae
  • Zygaena punctum, a species of moth in the Zygaenidae family, found in most of Central and Southern Europe and in the Ukraine, Russia and Turkey