The bone system

The sphenoid sinus

The sphenoid sinus (sinus sphenoidalis) is located in the body of the sphenoid bone. The lower wall of the sinus is involved in the formation of the wall of the nasal cavity. To the upper part of the lateral wall is a cavernous sinus.

The frontal sinus

The frontal sinus (sinus frontalis) varies considerably in size. The septum, dividing the frontal sinus into the right and left parts, is usually asymmetric.

Occipital bone

The occipital bone (os occipitale) is located in the posterior part of the brain area of the skull. In this bone, the basilar part, the two lateral parts and the occipital scales, which surround the large (occipital) foramen (foramen magnum), are distinguished.


The orbita (orbita) is a pair of cavities resembling a four-sided pyramid with rounded edges. The base of the pyramid is turned forward and forms the entrance to the eye socket (aditus orbitae).

Hyoid bone

The hyoid bone (os hyoideum) is located in the anterior region of the neck, between the lower jaw at the top and the larynx below. It consists of an arcuate bent body and two pairs of processes - small and large horns.

Lower jaw

The lower jaw (mandibula) is the only mobile skull bone. The unpaired lower jaw has a body and two branches.


The cheek bone (os zygomaticum) is paired, connects the frontal, temporal and maxillary bones, strengthening the facial skull. In the malar bone, the lateral, temporal and orbital surfaces are distinguished.

Lacrimal bone

The lacrimal bone (os lacrimale) is paired, forming the anterior part of the medial wall of the orbit. From below and from the front it is connected with the frontal process of the upper jaw, at the back - with the orbital plate of the latticed bone.

Nasal bone

The nasal bone (os nasale) is paired, participates in the formation of the ossicus of the nose. The upper edge of the nasal bone is connected with the nasal part of the frontal bone, the lateral margin - with the frontal process of the upper jaw.


Vomer (vomer) - unpaired bone plate, participates in the formation of the bony septum of the nose. The lower edge of the opener fuses with the nasal crests of the maxilla and palatine bone.
Translation Disclaimer: The original language of this article is Russian.
For the convenience of users of the iLive portal who do not speak Russian,
this article has been translated into the current language, but has not yet
been verified by a native speaker who has the necessary qualifications for this.
In this regard, we warn you that the translation of this article may be 
incorrect, may contain lexical, syntactic and grammatical errors.