occipitomastoid

Definitions

Of or pertaining to the occipital bone and the mastoid part of the temporal bone: as, the occipitomastoid or masto-occipital suture.

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It is formed by the dorsum sellæ and clivus of the sphenoid, the occipital, the petrous and mastoid portions of the temporals, and the mastoid angles of the parietal bones; it is crossed by the occipitomastoid and the parietomastoid sutures, and lodges the cerebellum, pons, and medulla oblongata.

II. Osteology. 5d. The Interior of the Skull 1918
The lambdoidal suture is continuous below with the occipitomastoid suture between the occipital and the mastoid portion of the temporal.

II. Osteology. 5c. The Exterior of the Skull 1918
The point of meeting of the parietomastoid, occipitomastoid, and lambdoidal sutures is known as the asterion.

II. Osteology. 5c. The Exterior of the Skull 1918
In or near the occipitomastoid suture is the mastoid foramen for the passage of the mastoid emissary vein.

II. Osteology. 5c. The Exterior of the Skull 1918
In the middle line is the posterior part of the sagittal suture connecting the parietal bones; extending downward and lateralward from the hinder end of the sagittal suture is the deeply serrated lambdoidal suture joining the parietals to the occipital and continuous below with the parietomastoid and occipitomastoid sutures; it frequently contains one or more sutural bones.

II. Osteology. 5c. The Exterior of the Skull 1918