In the ethmoid bone, a sickle shaped projection, the uncinate process, projects posteroinferiorly from the ethmoid labyrinth. Between the posterior edge of this process and the anterior surface of the ethmoid bulla, there is a two-dimensional space, resembling a crescent shape. This space continues laterally as a three-dimensional slit-like space - the ethmoidal infundibulum. This is bounded by the uncinate process, medially, the orbital lamina of ethmoid bone (lamina papyracea), laterally, and the ethmoidal bulla, posterosuperiorly. This concept is easier to understand if one imagine the infundibulum as a prism so that its medial face is the hiatus semilunaris. The "lateral face" of this infundibulum contains the ostium of the maxillary sinus, which, therefore, opens into the infundibulum.
Uncinate process of ethmoid bone
Lateral wall of nasal cavity, showing ethmoid bone in position.(Uncinate process of ethmoid labeled at left.)
Ethmoid bone from the right side. (Uncinate process labeled at bottom right.)
The uncinate process can be attached to either the lateral nasal wall, on the lamina papyracea (50%), the anterior cranial fossa, on the ethmoidal roof (25%), or the middle concha (25%). The superior attachment of the uncinate process determines the drainage pattern of the frontal sinus. In the first case, the infundibulum and the frontal recess are separated from each other, forcing the frontal sinus to drain directly into the middle meatus and not into the ethmoidal infundibulum. With the other configurations, the sinus will drain, firstly, into the infundibulum.
Referencesedit
This article incorporates text in the public domain from page 155 of the 20th edition ofGray's Anatomy(1918)
G., Arun et alli (2017) - Anatomical variations in superior attachment of uncinate process and localization of frontal sinus outflow tract. International Journal of Otorhinolaryngology and Head and Neck Surgery, 3(2):176-179
P.S., Hechl et alli (1997) - The hiatus semilunaris and infundibulum. Endoscopic Anatomy of the Paranasal Sinuses. Springer, Vienna
External linksedit
Anatomy figure: 33:01-02 at Human Anatomy Online, SUNY Downstate Medical Center - "The bones of the lateral nasal wall."
uncinate, process, ethmoid, bone, this, article, includes, list, references, related, reading, external, links, sources, remain, unclear, because, lacks, inline, citations, please, help, improve, this, article, introducing, more, precise, citations, 2015, lear. This article includes a list of references related reading or external links but its sources remain unclear because it lacks inline citations Please help improve this article by introducing more precise citations May 2015 Learn how and when to remove this message In the ethmoid bone a sickle shaped projection the uncinate process projects posteroinferiorly from the ethmoid labyrinth Between the posterior edge of this process and the anterior surface of the ethmoid bulla there is a two dimensional space resembling a crescent shape This space continues laterally as a three dimensional slit like space the ethmoidal infundibulum This is bounded by the uncinate process medially the orbital lamina of ethmoid bone lamina papyracea laterally and the ethmoidal bulla posterosuperiorly This concept is easier to understand if one imagine the infundibulum as a prism so that its medial face is the hiatus semilunaris The lateral face of this infundibulum contains the ostium of the maxillary sinus which therefore opens into the infundibulum Uncinate process of ethmoid boneLateral wall of nasal cavity showing ethmoid bone in position Uncinate process of ethmoid labeled at left Ethmoid bone from the right side Uncinate process labeled at bottom right DetailsIdentifiersLatinprocessus uncinatus ossis ethmoidalisTA98A02 1 07 016TA2737FMA57455Anatomical terms of bone edit on Wikidata Variations editThe uncinate process can be attached to either the lateral nasal wall on the lamina papyracea 50 the anterior cranial fossa on the ethmoidal roof 25 or the middle concha 25 The superior attachment of the uncinate process determines the drainage pattern of the frontal sinus In the first case the infundibulum and the frontal recess are separated from each other forcing the frontal sinus to drain directly into the middle meatus and not into the ethmoidal infundibulum With the other configurations the sinus will drain firstly into the infundibulum References edit nbsp This article incorporates text in the public domain from page 155 of the 20th edition of Gray s Anatomy 1918 G Arun et alli 2017 Anatomical variations in superior attachment of uncinate process and localization of frontal sinus outflow tract International Journal of Otorhinolaryngology and Head and Neck Surgery 3 2 176 179P S Hechl et alli 1997 The hiatus semilunaris and infundibulum Endoscopic Anatomy of the Paranasal Sinuses Springer ViennaExternal links editAnatomy figure 33 01 02 at Human Anatomy Online SUNY Downstate Medical Center The bones of the lateral nasal wall Portal nbsp Anatomy nbsp This human musculoskeletal system article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Uncinate process of ethmoid bone amp oldid 1189609826, wikipedia, wiki, book, books, library,
