Nasal bone

The nasal bones are two small oblong bones, 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 bridge of the nose.

Each has two surfaces and four borders.

Nasal bone
Illu facial bones
Nasal bone visible at center, in dark green.
Gray852
Cartilages of the nose. Side view. (Nasal bone visible at upper left.)
Details
Identifiers
Latinos nasale
MeSHD009295
TAA02.1.10.001
FMA52745
Anatomical terms of bone

Structure

The two nasal bones are joined at the midline internasal suture and make up the bridge of the nose.

Surfaces

The outer surface is concavo-convex from above downward, convex from side to side; it is covered by the procerus and nasalis muscles, and perforated about its center by a foramen, for the transmission of a small vein.

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 and ethmoid, and two of the face, the opposite nasal and the maxilla.

Other animals

In primitive bony fish and tetrapods, the nasal bones are the most anterior of a set of four paired bones forming the roof of the skull, being followed in sequence by the frontals, the parietals, and the postparietals. 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. Turtles, unusually, lack nasal bones, with the prefrontal bones of the orbit reaching all the way to the nostrils.[1]

Additional images

Gray153

Lateral wall of nasal cavity, showing ethmoid bone in position.

Gray155

Right nasal bone. Outer surface.

Gray156

Right nasal bone. Inner surface.

See also

References

  1. ^ Romer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. pp. 217–241. ISBN 0-03-910284-X.

External links

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