Encyclopedia entry

Lacrimal Bone

Version 1

Abstract

The lacrimal bone may be divided into two or more parts or fused with neighboring bones. This bone may exhibit so many minute foramina that it takes the appearance of a bony net. It may be fused with or divided by the lamina papyracea. A contribution from the frontal bone has been reported. The pars lacrimalis may be deficient and this may be filled by the frontal process of the maxilla. In some cases the crest is reduced in size or absent. The hamulus may be absent, represented by a fibrous band, or be unusually long.

The lacrimal bone may be divided into two or more parts or fused with neighboring bones. This bone may exhibit so many minute foramina that it takes the appearance of a bony net.

It may be fused with or divided by the lamina papyracea. A contribution from the frontal bone has been reported.

The pars lacrimalis may be deficient and this may be filled by the frontal process of the maxilla.

In some cases the crest is reduced in size or absent.

The hamulus may be absent, represented by a fibrous band, or be unusually long. An enlarged hamulus may articulate with the maxillary process of the zygomatic bone. The hamulus is sometimes replaced by an ossicle; additional perilacrimal ossicles have also been reported associated with the lacrimal bone. The lacrimal hamulus is regarded as representing the remains of the facial part of the lacrimal bone present in some mammals.

The nasolacrimal duct may open into the middle meatus.

Also see Sphenoid Bone .

Riferimenti dell’opera originale

Elenco riportato come compare nella fonte, senza normalizzazione dei formati bibliografici.

  • Flecker, H. (1914) Observations upon cases of absence of lacrimal bones and the existence of perilacrimal ossicles. J. Anat. Physiol. 48:52-72.
  • Fusari, R. (1897) Sur les différents mode de substitution de la partie postérieure de la lame papyraceé l'orbite de l'homme. Arch. Ital. Biol. 28:470-471.
  • Geddes, A.C. (1910) An abnormal nasal duct. Anat. Anz. 37:5-8.
  • Gérard, G. (1906) Notion d'un éperon lacymal antérieur. Assoc. Anatomistes Comptes Rendus 8:114-119.
  • Kopylow, M.B. (1930) Ein neues Verfahren zur röntgenologischen Darstellung des Canalis nasolacrimalis. Röntgenpraxis 2:686-692.

Anatomical classification

Systems:
Skeletal system

Content provenance

Adaptation

Adaptation of «Lacrimal Bone — Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System» by Ronald A. Bergman, Adel K. Afifi, Ryosuke Miyauchi. Source: https://www.anatomyatlases.org/AnatomicVariants/SkeletalSystem/Text/LacrimalBone.shtml Original work distributed under the CC BY-NC-SA 4.0 licence (https://creativecommons.org/licenses/by-nc-sa/4.0/deed.it). Adaptation by Redazione AIVA. Changes from the original: Testo originale inglese riprodotto integralmente e riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti), senza modificarne le affermazioni. La traduzione italiana non è ancora stata eseguita, e la pagina lo dichiara. Le figure non sono state copiate: sono collegate alla pagina d’origine. This publication is not approved or endorsed by the authors of the original work.

Licence

This content is distributed under the licence CC BY-NC-SA 4.0. Licences and attribution