The paired frontal bone (lat. Os frontale ) is a part of the brain skull . It forms the front roof of the skull and thus the front upper wall of the cranial cavity , and in ruminants a large part of the skull roof. The frontal bones on both sides are connected to each other in the median plane via a cranial suture , the sutura frontalis ("frontal suture ").
The frontal bone forms the upper ( margo supraorbitalis ) and rear part of the bony eye socket ( orbit ). The posterior margin is formed by an extension ( processus zygomaticus ossis frontalis ). In carnivores and pigs this process is only short. Here the rear edge of the orbit is only closed by a connective tissue band ( ligamentum orbitale ) that runs between the zygomatic process of the frontal bone and the frontal process of the zygomatic bone .
In humans and other primates , the frontal bone has a distinct bulge above the eyes, which is known as the arch of the eyebrow ( arcus superciliaris ). The glabella lies between the two arches of the eyebrows above the root of the nose .
In horn-bearing ruminants , the frontal bone forms a bony horn cone ( processus cornualis ) in the horn . The frontal sinus extends into this process so that the frontal sinus is opened when adult ruminants are dehorned.
- Franz-Viktor Salomon: Bony skeleton . In: Franz-Viktor Salomon et al. (Hrsg.): Anatomie für die Tiermedizin . 3. Edition. Enke, Stuttgart 2015, ISBN 978-3-8304-1288-5 , pp. 96-97 .
- Federative Committee on Anatomical Terminology (FCAT) (1998). Terminologia Anatomica . Stuttgart: Thieme