The nasal bones are two small oblong , varying in size and form in different individuals; they are placed side by side at the middle and upper part of the face and by their junction, form the nasal bridge of the upper one third of the nose.
Each has two surfaces and four borders.
Structure
There is heavy variation in the structure of the nasal bones, accounting for the differences in sizes and shapes of the nose seen across different people. Angles, shapes, and configurations of both the bone and cartilage are heavily varied between individuals. Broadly, most nasal bones can be categorized as "V-shaped" or "S-shaped" but these are not scientific or medical categorizations. When viewing anatomical drawings of these bones, consider that they are unlikely to be accurate for a majority of people.
The two nasal bones are joined at the midline internasal suture and make up the nasal bridge.
Surfaces
The
outer surface is from above downward, convex from side to side; it is covered by the
Procerus muscle and
Nasalis muscle muscles, and perforated about its center by the
nasal foramen, a small passageway for the transmission of a small
vein from the overlying soft tissues.
The inner surface is concave from side to side, and is traversed from above downward, by a groove for the passage of a branch of the nasociliary nerve.
Articulations
The nasal articulates with four bones: two of the cranium, the
Frontal bone and
ethmoid, and two of the face, the opposite nasal and the
maxilla.
Other animals
In primitive
Osteichthyes and
, the nasal bones are the most anterior of a set of four paired bones forming the
skull roof, being followed in sequence by the frontals, the
parietal bone, and the
Postparietal. Their form in living species is highly variable, depending on the shape of the head, but they generally form the roof of the snout or beak, running from the nostrils to a position short of the orbits. In most animals, they are generally therefore proportionally larger than in humans or great apes, because of the shortened faces of the latter.
, unusually, lack nasal bones, with the
of the orbit reaching all the way to the nostrils.
Romer, Alfred Sherwood (1977). 003910284X, Holt-Saunders International. 003910284X
==Additional images==
See also
External links
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—"Anterior view of skull."
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—"Orbits and Eye: Bones"
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—"The bones of the lateral nasal wall."
