Vomer.html



Vomer
Vomer labeled at left.
Bones and cartilages of septum of nose. Right side. (Vomer visible at bottom left.)
Gray's	subject #43 170
MeSH	Vomer

The vomer (from Latin vomer, -ĕris, "ploughshare") is one of the unpaired facial bones of the skull. It is located in the midsagittal line, and articulates with the sphenoid, the ethmoid, the left and right palatine bones, and the left and right maxillary bones.

Vomeronasal organ

The vomeronasal organ, also called Jacobson's organ, is a chemoreceptor organ named for its closeness to the vomer and nasal bones, and is particularly developed in animals such as cats (who adopt a characteristic pose called the Flehmen reaction or flehming when making use of it), and is thought to have to do with the perception of certain pheromones.

Anatomical details

The vomer is situated in the median plane, but its anterior portion is frequently bent to one or other side.

It is thin, somewhat quadrilateral in shape, and forms the hinder and lower part of the nasal septum; it has two surfaces and four borders.

The surfaces are marked by small furrows for blood vessels, and on each is the nasopalatine groove, which runs obliquely downward and forward, and lodges the nasopalatine nerve and vessels.

Borders

The superior border, the thickest, presents a deep furrow, bounded on either side by a horizontal projecting ala of bone; the furrow receives the rostrum of the sphenoid, while the margins of the alæ articulate with the vaginal processes of the medial pterygoid plates of the sphenoid behind, and with the sphenoidal processes of the palatine bones in front.

The inferior border articulates with the crest formed by the maxillæ and palatine bones.

The anterior border is the longest and slopes downward and forward. Its upper half is fused with the perpendicular plate of the ethmoid; its lower half is grooved for the inferior margin of the septal cartilage of the nose.

The posterior border is free, concave, and separates the choanae. It is thick and bifid above, thin below.

Articulations

The vomer articulates with six bones:

• two of the cranium, the sphenoid and ethmoid.
• four of the face, the two maxillae; and the two palatine bones.

It also articulates with the septal cartilage of the nose.

Trivia

It has been suggested that by alternately thrusting with the tongue against the roof of the mouth while pressing with the fingers between the eyebrows, one can move the vomer, and if repeated for about 20 seconds, the sinuses will discharge, thus rapidly clearing a stuffy head without the use of drugs.¹. There is no scientific evidence that this procedure actually works.

Additional images

Median wall of left nasal cavity showing vomer in situ.	The vomer.	Base of skull. Inferior surface.	The skull from the front.
Sagittal section of skull.

See also

• Ossification of vomer
• Bone terminology
• Terms for anatomical location

External links

• SUNY Labs 33:st-0232 - "Nasal Cavity: Bones"
• SUNY Figs 33:02-03 - "Diagram of skeleton of medial (septal) nasal wall."
• Norman/Georgetown lesson9 (nasalseptumbonescarti)
• Atlas of anatomy at UMich rsa1p7 - "Nasal septum, lateral view"
• Roche Lexicon - illustrated navigator, at Elsevier 34256.000-1
• Roche Lexicon - illustrated navigator, at Elsevier 34257.000-1

References

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.