frontal bone

The frontal bone is a wide or flat bone, situated forward and upward and has two portions: a vertical one, the scale, and a horizontal one, the roofs of the orbital and nasal cavities.

Scale

Outer Face : this face is convex and on it we find the following structures:

  • Supra-Orbital Edge
  • Frontal tuber – 3 cm above the supraorbital border
  • Superciliary Arches – ridges that extend laterally to the glabella
  • Glabella – between the two superciliary arches (anthropometric point)
  • Metopic suture – found in some rare cases and located just above the glabella and extending to the bregma through the midsagittal line. This suture, in childhood, divides the bone in two and can remain for life.
  • Notch or Supraorbital foramen - passage of supraorbital vessels and nerves.
  • Nasal Notch – rough and irregular gap
  • Nasal Spine – located anteriorly and in the center of the nasal notch

Inner face :

  • Front Crest
  • foramen cecum – located at the end of the frontal crest and is where the dura mater inserts

Ceilings of Orbital and Nasal Cavities

They form the roof of the orbit, the ethmoidal notch (separates the two orbital laminae) and the ostia of the frontal sinus (anterior to the ethmoidal notch). This sinus makes the frontal bone with characteristics of a pneumatic, hollow bone.


The Frontal articulates with twelve bones: Sphenoid, Ethmoid, Parietal (2), Nasal (2), Maxillary (2), Lacrimal (2) and Zygomatic (2).

FRONT - FRONT VIEW
Osso Frontal - Vista Anterior
Source: SOBOTTA, Johannes. Atlas of Human Anatomy. 21 ed. Rio de Janeiro: Guanabara Koogan, 2000

FRONT - BOTTOM VIEW
Osso Frontal - Vista Inferior
Source: SOBOTTA, Johannes. Atlas of Human Anatomy. 21 ed. Rio de Janeiro: Guanabara Koogan, 2000.


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