The vomer is an unpaired sagittal-oriented and trapezoid-shaped midline bone that forms the bony nasal septum along with the perpendicular plate of the ethmoid bone.

The vomer forms the posterior inferior part of the bony septum.

The posterior part of the superior aspect of the vomer contains two thickened wings or alae. Both wings are separated by a deep groove in the midline between them. They are attached to the sphenoid bone.

The perpendicular plate extends downward from the midline of the superior surface below the wings.

The vomer articulates with the following structures:

Posterosuperiorly - with the body and the rostrum of the sphenoid;
Anterosuperiorly - with the perpendicular plate of the ethmoid bone;
Anteroinferiorly - with the palatine process of the maxilla;
Posteroinferiorly - with the horizontal plates of the palatine bones;
Anteriorly - with the nasal cartilages.

The posterior border contains a curve and a free edge. It divides the posterior nasal aperture into two divisions.

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Vomer