Lacrimal bone
Updates to Article Attributes
The lacrimal bones are paired craniofacial bones forming the anterior aspect of the medial orbital walls.
Gross anatomy
The lacrimal bones have two surfaces and four borders. The lateral orbital surface is divided by a vertical posterior lacrimal crest with an anterior fossa for lacrimal sac and lacrimal hamulus which with the maxilla forms the upper orifice of the nasolacrimal canal.The which contains the nasolacrimal duct. The medial nasal surface is part of the middle meatus and meets the anterior ethmoidal air cells. The anterior border articulates with the frontal process of the maxilla at the lacrimomaxillary suture, and the posterior border with theethmoidal orbital plate. The superior border meets the frontal bone and inferiorly, the maxillary orbital surface.
Attachments
OrbicularisThe orbicularis oculi muscle is attached to the orbital surface and posterior lacrimal crest.
Ossification
LacrimalThe lacrimal bone ossifies from a single centre which appears around the twelfth week in the mesenchyme around the nasal capsule.
-<p>The<strong> lacrimal bones</strong> are paired craniofacial bones forming anterior aspect of the medial orbital walls. </p><h4>Gross anatomy</h4><p>The lacrimal bones have two surfaces and four borders. The lateral orbital surface is divided by a vertical <a href="/articles/posterior-lacrimal-crest">posterior lacrimal crest </a>with an anterior <a href="/articles/lacrimal-sac-fossa">fossa</a> for <a href="/articles/lacrimal-sac">lacrimal sac</a> and lacrimal hamulus which with the maxilla forms the upper orifice of the nasolacrimal canal.The medial nasal surface is part of the middle meatus and meets the anterior ethmoidal air cells. The anterior border articulates with the frontal process of the <a href="/articles/maxilla">maxilla</a> at the <a href="/articles/lacrimomaxillary-suture">lacrimomaxillary suture</a>, and the posterior border with the<a href="/articles/labyrinth-of-ethmoid-bone"> ethmoidal</a> orbital plate. The superior border meets the <a href="/articles/frontal-bone">frontal bone</a> and inferiorly, the maxillary orbital surface.</p><h5>Attachments</h5><p>Orbicularis oculi muscle is attached to the orbital surface and posterior lacrimal crest.</p><h5>Ossification</h5><p>Lacrimal bone ossifies from a single centre which appears around the twelfth week in the mesenchyme around the nasal capsule.</p>- +<p>The<strong> lacrimal bones</strong> are paired craniofacial bones forming the anterior aspect of the medial <a title="Orbit" href="/articles/orbit">orbital walls</a>. </p><h4>Gross anatomy</h4><p>The lacrimal bones have two surfaces and four borders. The lateral orbital surface is divided by a vertical <a href="/articles/posterior-lacrimal-crest">posterior lacrimal crest </a>with an anterior <a href="/articles/lacrimal-sac-fossa">fossa</a> for <a href="/articles/lacrimal-sac">lacrimal sac</a> and lacrimal hamulus which with the maxilla forms the upper orifice of the <a title="Nasolacrimal canal" href="/articles/nasolacrimal-canal">nasolacrimal canal</a> which contains the <a title="Nasolacrimal duct" href="/articles/nasolacrimal-duct">nasolacrimal duct</a>. The medial nasal surface is part of the <a title="Middle meatus" href="/articles/middle-meatus">middle meatus</a> and meets the <a title="Ethmoidal air cells" href="/articles/ethmoidal-air-cells">anterior ethmoidal air cells</a>. The anterior border articulates with the frontal process of the <a href="/articles/maxilla">maxilla</a> at the <a href="/articles/lacrimomaxillary-suture">lacrimomaxillary suture</a>, and the posterior border with the <a href="/articles/labyrinth-of-ethmoid-bone">ethmoidal</a> orbital plate. The superior border meets the <a href="/articles/frontal-bone">frontal bone</a> and inferiorly, the maxillary orbital surface.</p><h5>Attachments</h5><p>The <a title="Orbicularis oculi muscle" href="/articles/orbicularis-oculi-muscle-1">orbicularis oculi muscle</a> is attached to the orbital surface and posterior lacrimal crest.</p><h5>Ossification</h5><p>The lacrimal bone ossifies from a single centre which appears around the twelfth week in the mesenchyme around the nasal capsule.</p>
References changed:
- 1. Gray, H. Anatomy of the Human Body. Philadelphia: Lea & Febiger, 1918; Bartleby Edition 2000. <a href="https://www.bartleby.com/lit-hub/bibliography/anatomy-of-the-human-body/">Bartleby.com</a>
Unable to process the form. Check for errors and try again.