Lacrimal bone

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Bone: Lacrimal bone
Lacrimal bone visible near center.
Orbital bones
Latin	os lacrimale
Gray's	subject #39 164

WikiDoc Resources for Lacrimal bone
Articles
Most recent articles on Lacrimal bone Most cited articles on Lacrimal bone Review articles on Lacrimal bone Articles on Lacrimal bone in N Eng J Med, Lancet, BMJ
Media
Powerpoint slides on Lacrimal bone Images of Lacrimal bone Photos of Lacrimal bone Podcasts & MP3s on Lacrimal bone Videos on Lacrimal bone
Evidence Based Medicine
Cochrane Collaboration on Lacrimal bone Bandolier on Lacrimal bone TRIP on Lacrimal bone
Clinical Trials
Ongoing Trials on Lacrimal bone at Clinical Trials.gov Trial results on Lacrimal bone Clinical Trials on Lacrimal bone at Google
Guidelines / Policies / Govt
US National Guidelines Clearinghouse on Lacrimal bone NICE Guidance on Lacrimal bone NHS PRODIGY Guidance FDA on Lacrimal bone CDC on Lacrimal bone
Books
Books on Lacrimal bone
News
Lacrimal bone in the news Be alerted to news on Lacrimal bone News trends on Lacrimal bone
Commentary
Blogs on Lacrimal bone
Definitions
Definitions of Lacrimal bone
Patient Resources / Community
Patient resources on Lacrimal bone Discussion groups on Lacrimal bone Patient Handouts on Lacrimal bone Directions to Hospitals Treating Lacrimal bone Risk calculators and risk factors for Lacrimal bone
Healthcare Provider Resources
Symptoms of Lacrimal bone Causes & Risk Factors for Lacrimal bone Diagnostic studies for Lacrimal bone Treatment of Lacrimal bone
Continuing Medical Education (CME)
CME Programs on Lacrimal bone
International
Lacrimal bone en Espanol Lacrimal bone en Francais
Businness
Lacrimal bone in the Marketplace Patents on Lacrimal bone
Experimental / Informatics
List of terms related to Lacrimal bone

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Overview

The lacrimal bone, the smallest and most fragile bone of the face, is situated at the front part of the medial wall of the orbit. It has two surfaces and four borders.

Surfaces

Lateral or orbital surface

The lateral or orbital surface is divided by a vertical ridge, the posterior lacrimal crest, into two parts.

In front of this crest is a longitudinal groove, the lacrimal sulcus (sulcus lacrimalis), the inner margin of which unites with the frontal process of the maxilla, and the lacrimal fossa is thus completed. The upper part of this fossa lodges the lacrimal sac, the lower part, the nasolacrimal duct.

The portion behind the crest is smooth, and forms part of the medial wall of the orbit.

The crest, with a part of the orbital surface immediately behind it, gives origin to the lacrimal part of the Orbicularis oculi and ends below in a small, hook-like projection, the lacrimal hamulus, which articulates with the lacrimal tubercle of the maxilla, and completes the upper orifice of the nasolacrimal canal; the hamulus sometimes exists as a separate piece, and is then called the lesser lacrimal bone.

Medial or nasal surface

The medial or nasal surface presents a longitudinal furrow, corresponding to the crest on the lateral surface.

The area in front of this furrow forms part of the middle meatus of the nose; that behind it articulates with the ethmoid, and completes some of the anterior ethmoidal cells.

Borders

Of the four borders:

• the anterior articulates with the frontal process of the maxilla;
• the posterior with the lamina papyracea of the ethmoid;
• the superior with the frontal bone.
• The inferior is divided by the lower edge of the posterior lacrimal crest into two parts:
  • the posterior part articulates with the orbital plate of the maxilla;
  • the anterior is prolonged downward as the descending process, which articulates with the lacrimal process of the inferior nasal concha, and assists in forming the canal for the nasolacrimal duct.

Ossification

The lacrimal is ossified from a single center, which appears about the twelfth week in the membrane covering the cartilaginous nasal capsule.

Articulations

The lacrimal articulates with four bones: two of the cranium, the frontal and ethmoid, and two of the face, the maxilla and the inferior nasal concha.

Additional images

Left lacrimal bone. Orbital surface. Enlarged	Side view of the skull.	The skull from the front.	Medial wall of left orbit.
Roof, floor, and lateral wall of left nasal cavity.

See also

• Bone terminology
• Terms for anatomical location

External links

• Lacrimal+bone at eMedicine Dictionary
• Atlas of anatomy at UMich eye_5
• Atlas of anatomy at UMich rsa2p4
• Roche Lexicon - illustrated navigator, at Elsevier 34256.000-1
• Diagram at upstate.edu

v • d • e The Bones which form the Orbit
Frontal bone • Zygomatic bone • Maxillary bone • Sphenoid bone • Ethmoid bone • Palatine bone • Lacrimal bone

v • d • e Bones of head and neck: the facial bones of the skull
Maxilla	Surfaces Anterior: fossae (Incisive fossa, Canine fossa) - Infraorbital foramen - Anterior nasal spine Infratemporal: Alveolar canals - Maxillary tuberosity Orbital: Infraorbital groove - Infraorbital canal Nasal: Pterygopalatine canal Processes Zygomatic process Frontal process (Agger nasi, Anterior lacrimal crest) Alveolar process Palatine process (Incisive foramen, Incisive canals, Foramina of Scarpa, Incisive bone, Anterior nasal spine) Other Body of maxilla - Maxillary sinus
Zygomatic	Orbital process (Zygomatico-orbital) - Temporal process (Zygomaticotemporal) - Lateral process (Zygomaticofacial)
Palatine	Fossae Pterygopalatine fossa - Pterygoid fossa Plates Horizontal plate (Posterior nasal spine) - Perpendicular plate (Pterygopalatine canal, Sphenopalatine foramen, Pyramidal process) Processes Orbital - Sphenoidal
Mandible	Body external surface (Symphysis menti, Mental protuberance, Mental foramen) - internal surface (Mental spine, Mylohyoid line, Sublingual fovea, Submandibular fovea) - Alveolar part of mandible Ramus Mylohyoid groove (Mandibular canal, Lingula) - Mandibular foramen - Angle Coronoid process - Mandibular notch - Condyloid process
Minor/ nose	Nasal bone: Internasal suture - Nasal foramina Inferior nasal concha: Ethmoidal process - Maxillary process Vomer: Wing Lacrimal: Posterior lacrimal crest - Lacrimal groove - Lacrimal hamulus

v • d • e WikiDoc Research Resources for Lacrimal bone (Click show to right to view)
Articles on Lacrimal bone	Most recent articles on Lacrimal bone • Most cited articles on Lacrimal bone • Review articles on Lacrimal bone • Articles on Lacrimal bone in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Lacrimal bone	Powerpoint slides on Lacrimal bone • Images of Lacrimal bone • Photos of Lacrimal bone • Podcasts & MP3s on Lacrimal bone • Videos on Lacrimal bone
Evidence Based Medicine Regarding Lacrimal bone	Cochrane Collaboration on Lacrimal bone • Bandolier on Lacrimal bone • TRIP on Lacrimal bone
Cost Effectiveness of Lacrimal bone	Cost Effectiveness of Lacrimal bone
Clinical Trials Involving Lacrimal bone	Ongoing Trials on Lacrimal bone at Clinical Trials.gov • Trial results on Lacrimal bone • Clinical Trials on Lacrimal bone at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Lacrimal bone	US National Guidelines Clearinghouse on Lacrimal bone • NICE Guidance on Lacrimal bone • NHS PRODIGY Guidance • FDA on Lacrimal bone • CDC on Lacrimal bone
Textbook Information on Lacrimal bone	Books and Textbook Information on Lacrimal bone
Pharmacology Resources on Lacrimal bone	Dosing of Lacrimal bone • Drug interactions with Lacrimal bone • Side effects of Lacrimal bone • Allergic reactions to Lacrimal bone • Overdose information on Lacrimal bone • Carcinogenicity information on Lacrimal bone • Lacrimal bone in pregnancy • Pharmacokinetics of Lacrimal bone •
Genetics, Pharmacogenomics, and Proteinomics of Lacrimal bone	Genetics of Lacrimal bone • Pharmacogenomics of Lacrimal bone • Proteomics of Lacrimal bone
Newstories on Lacrimal bone	Lacrimal bone in the news • Be alerted to news on Lacrimal bone • News trends on Lacrimal bone
Commentary on Lacrimal bone	Blogs on Lacrimal bone
Patient Resources on Lacrimal bone	Patient resources on Lacrimal bone • Discussion groups on Lacrimal bone • Patient Handouts on Lacrimal bone • Directions to Hospitals Treating Lacrimal bone • Risk calculators and risk factors for Lacrimal bone
Healthcare Provider Resources on Lacrimal bone	Symptoms of Lacrimal bone • Causes & Risk Factors for Lacrimal bone • Diagnostic studies for Lacrimal bone • Treatment of Lacrimal bone
Continuing Medical Education (CME) Programs on Lacrimal bone	CME Programs on Lacrimal bone
International Resources on Lacrimal bone	Lacrimal bone en Espanol • Lacrimal bone en Francais
Business Resources on Lacrimal bone	Lacrimal bone in the Marketplace • Patents on Lacrimal bone
Informatics Resources on Lacrimal bone	List of terms related to Lacrimal bone

ca:Unguis

de:Tränenbeinfr:Os lacrymal ja:涙骨 lt:ašarikaulissk:Slzná kosť uk:Слізна кістка sl:Solznica

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .