Nasal bone

The nasal bones are a pair of small, oblong bones located in the central-upper region of the human skull. They meet in the middle at the internasal suture, contributing to the formation of the bridge of the nose. Each bone is distinguished by two surfaces and delimited by four borders.

The outer surface of each nasal bone is concave from top to bottom and shows convexity from side-to-side. This surface is covered by the Procerus and Compressor naris muscle. Notably, around its midpoint, there is a small foramen for the passage of a tiny vein. In contrast, the inner surface presents a concave profile from one side to the other, featuring a pronounced vertical groove tailored to accommodate the anterior ethmoidal nerve; a branch of the nasociliary nerve.

The nasal bone‘s superior border engages in articulation with the frontal bone of the forehead, creating the frontonasal suture. The nasion is the defined point of junction between the frontonasal and internasal sutures. Laterally, or on the sides, the borders are meticulously angled to mesh with the frontal process of the maxilla, ensuring a flawless intergration with the facial skeleton. On the inferior aspect, the nasal bones connect with the lateral cartilage of the nose. Along the internasal suture, in the midline, the medial borders extends rearward into a vertical crest, forming a pivotal part of the nasal septum. This crest sequentially articulates with the spine of the frontal bone, the perpendicular plate of the ethmoid bone, and the nasal septal cartilage, playing an essential role in dividing the nasal cavity and supporting the structural integrity of the nose.