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 upper one third of the nose.

Nasal bone
Nasal bone visible at center, in dark green.
Cartilages of the nose. Side view. (Nasal bone visible at upper left.)
Details
Identifiers
Latinos nasale
MeSHD009295
TA98A02.1.10.001
TA2748
FMA52745
Anatomical terms of bone

Each has two surfaces and four borders.

Structure edit

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.[1]

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

Surfaces edit

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 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 edit

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.

Animals edit

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.[2]

Additional images edit

See also edit

References edit

  1. ^ Lazovic, Goran D.; Daniel, Rollin K.; Janosevic, Ljiljana B.; Kosanovic, Rade M.; Colic, Miodrag M.; Kosins, Aaron M. (1 March 2015). "Rhinoplasty: The Nasal Bones – Anatomy and Analysis". Aesthetic Surgery Journal. 35 (3): 255–263. doi:10.1093/asj/sju050. ISSN 1527-330X.
  2. ^ 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 edit