nasal bone 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 upper one third of the nose. nasal bonenasal bone visible at center, in dark green.cartilages of the nose. side view. (nasal bone visible at upper left.)detailsidentifierslatinos nasalemeshd009295ta98a02.1.10.001ta2748fma52745anatomical terms of bone each has two surfaces and four borders. 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. additional images lateral wall of nasal cavity, showing ethmoid bone in position. right nasal bone. outer surface. right nasal bone. inner surface.