Frontal bone

The paired frontal bone (Latin frontal bone ) is a part of the skull. It forms the anterior cranial roof, the same a large part in ruminants. The front legs of both sides in the median plane of a skull suture, which, coupled frontal suture ( " frontal suture " ) with each other.

The frontal bone forms the upper ( Margo supraorbital ) and posterior part of the bony eye socket (orbit ). The rear edge of an extension ( zygomatic process ossis frontalis) formed. In carnivores and pigs this extension is short. Here, the posterior margin of the orbit is only by a connective tissue band closed ( orbital ligament ) that runs between the zygomatic process of the frontal bone and the frontal process of the zygomatic bone.

In humans and other primates, the prefrontal bears a distinct ridge above the eyes, as the superciliary arches ( arcus superciliaris ) is called. Between the two eyebrows above the bridge of the nose, the high forehead ( glabella ).

Between the two bone plates of the frontal bone lined with a mucous membrane ballooning of the nasal cavity grows out. This sinus (sinus frontalis) is one of the paranasal sinuses.

In horned ruminants the skull forms a bony horn cores (Processus cornualis ) in the horn. In this extension, the frontal sinus is sufficient so that the frontal sinus is opened when dehorning adult ruminants.