Lacrimal hamulus
{{Short description|Small, hook-like bony projection of the lacrimal bone}}
{{Infobox anatomy
| Name = Lacrimal hamulus
| Latin = hamulus lacrimalis
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| System =skeletal
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|Part_of=lacrimal bone}}
The lacrimal hamulus is a small, hook-like bony projection of the lacrimal bone. It is a continuation of the posterior lacrimal crest. It articulates with the lacrimal tubercle of the maxilla, and completes the upper orifice of the lacrimal canaliculus. It sometimes exists as a separate piece, and is then called the lesser lacrimal bone.
Structure
The lacrimal hamulus is a small, hook-like bony projection of the lacrimal bone.{{Citation|last=Gupta|first=Nishi|title=Radiological Anatomy of the Lacrimal Drainage System|date=2021|url=https://doi.org/10.1007/978-981-15-8112-0_4|work=Endoscopic Dacryocystorhinostomy|pages=35–53|editor-last=Gupta|editor-first=Nishi|place=Singapore|publisher=Springer|language=en|doi=10.1007/978-981-15-8112-0_4|isbn=978-981-15-8112-0|s2cid=228890577 |access-date=2021-09-23|url-access=subscription}} It is a continuation of the posterior lacrimal crest of the lacrimal bone.{{Cite journal|last=Chmielewski|first=Piotr Paweł|date=2021|title=New Terminologia Anatomica: cranium and extracranial bones of the head|url=https://journals.viamedica.pl/folia_morphologica/article/view/FM.a2019.0129|journal=Folia Morphologica|language=en|volume=80|issue=3|pages=477–486|doi=10.5603/FM.a2019.0129|issn=1644-3284|pmid=31802475|doi-access=free}} It articulates with the lacrimal tubercle of the maxilla.{{Citation|last=Gupta|first=Nishi|title=Anatomy of Lacrimal Drainage System|date=2021|url=https://doi.org/10.1007/978-981-15-8112-0_2|work=Endoscopic Dacryocystorhinostomy|pages=9–21|editor-last=Gupta|editor-first=Nishi|place=Singapore|publisher=Springer|language=en|doi=10.1007/978-981-15-8112-0_2|isbn=978-981-15-8112-0|s2cid=228907568 |access-date=2021-09-23|url-access=subscription}} This completes the upper orifice of the lacrimal canaliculus.
= Relations =
The lacrimal hamulus is usually around 9 mm from the infraorbital foramen, around 20 mm from the inferior orbital fissure, and around 31 mm from the beginning of the posterior lacrimal crest.{{Cite journal|last1=Ganesh|first1=N. Praveen|last2=Maity|first2=Pushan|last3=Raja|first3=D. Alagar|last4=Rao|first4=R. V. M. Surya|last5=Narayanamurthy|first5=S.|last6=Prasath|first6=A.|date=2020-11-01|title=Triangulating the ledge: radiographic study of the floor of orbit and derivation of a novel template|url=https://www.sciencedirect.com/science/article/pii/S0266435620303387|journal=British Journal of Oral and Maxillofacial Surgery|language=en|volume=58|issue=9|pages=e104–e108|doi=10.1016/j.bjoms.2020.07.016|pmid=32800403 |s2cid=221143195 |issn=0266-4356|url-access=subscription}}
= Variation =
The lacrimal hamulus develops from its own site of primary ossification of cartilage. Because of this, it sometimes exists as a separate piece, and is then called the lesser lacrimal bone.
See also
References
{{Gray's}}
{{Facial bones}}
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