The bregmatic fontanelle or “anterior soft spot” exists here in infancy. The coronal and sagittal suture intersect at a point called bregma.

They articulate with one another medially at the sagittal suture and anteriorly with the frontal bone at the coronal suture. The parietals are paired bones which form the roof and sides of the calvaria. The paired temporal lines ascend superiorly and posteriorly from the zygomatic processes and constitute the superioranterior margin of the temporal fossae. The median crest in the midline of the bone represents an area of muscle attachment and shows variability reflecting muscular robusticity of the individual. These prominences may vary in size and degree of development in individuals and are also a characteristic of sexual dimorphism. The frontal eminences are paired prominences in the anterolateral regions of the squamous portion of the frontal bone. The glabella is a roughened region or a bulging prominence on the frontal bone above the nasal root at about the level of the supraorbital ridges. The supraorbital notches or foramina are grooves or openings for the passage of neurovascular structures.Ī trace of the metopic or frontal suture may be noted in the midsagittal region of this bone. These bony ridges are quite well developed in the skulls of some forms of fossil man, but are less pronounced in modern man. The supraorbital or brow ridges are bony ridges just above the orbits.

The frontal is a single bone which is comprised of two main parts, a squamous or flat portion which forms the forehead and articulates with the parietal bones and an orbital portion which provides a roof for the two orbits.

Frontal bone skull