The interactive dog atlas · Skeleton · Head

Frontal bone os frontale

The frontal bone is the bone of the forehead, above the eyes. Inside it is the frontal sinus, an air-filled cavity.

Educational material, not a diagnostic tool. Written by the Mantrailing România team from veterinary sources we read. Updated 14.11.2026.

Dog in left lateral view — exterior, muscles, skeleton and organs Vector study after the Ellenberger, Baum and Dittrich plates: a standing dog, head to the left, deep chest and digitigrade limbs. The four layers use the same contour: exterior with body regions, superficial muscles, skeleton and organs.
  1. Frontal bone
  2. Orbit
  3. Nasal bone
  4. Parietal bone
Frontal bone on the atlas drawing, "Skeleton" layer, with the neighbouring structures. Left lateral view, after the Ellenberger, Baum and Dittrich plates.

Where it is

The base of the forehead: above the orbits, between the nasal and the parietal bones.

System
Axial skeleton
Region
Head

What it is and what it does

The frontal bone, paired, forms the base of the forehead region: the nasal and orbital parts belong to the face, the squamous part to the roof of the skull. In the dog, the supraorbital process is very short, so the upper edge of the orbit is incomplete, as in the pig, and is closed by the orbital ligament. The frontal sinus, divided into compartments in the dog, is hollowed out in this bone, above the lateral masses of the ethmoid.

Worth remembering

The upper edge of the orbit is not complete in bone in the dog: a ligament closes it.

Names

  • Latin term: os frontale.
  • In Romanian: Osul frontal (Romanian page).

Guides it appears in