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The occipitomastoid suture, or occipitotemporal suture, is the cranial suture between the occipital bone and the mastoid portion of the temporal bone. It is continuous with the lambdoidal suture . See also
The nuchal lines are four curved lines on the external surface of the occipital bone: The upper, often faintly marked, is named the highest nuchal line, but is sometimes referred to as the Mempin line or linea suprema, and it attaches to the epicranial aponeurosis. Below the highest nuchal line is the superior nuchal line.
The bitemporal (8.0 cm), the greatest distance between the two temporal sutures. The occipitomental (12.5 cm), from the chin to the most prominent portion of the occiput; The suboccipitobregmatic (9.5 cm), which follows a line drawn from the middle of the large fontanel to the undersurface of the occipital bone just where it joins the neck
The occipital border, deeply denticulated (finely toothed), articulates with the occipital bone, forming half of the lambdoid suture. That point where the sagittal suture intersects the lambdoid suture is called the lambda , because of its resemblance to the Greek letter.
The ecdysial suture is longitudinally placed on the vertex, separating the epicranial halves of the head to the left and right sides. Depending on the insect, the suture may come in different shapes: like either a Y, U or V. Those diverging lines that make up the ecdysial suture are called the frontal or frontogenal sutures.
It is the point where three cranial sutures meet: the lambdoid suture. [1] parietomastoid suture. [1] occipitomastoid suture. [1] It is also the point where three cranial bones meet: the parietal bone. the occipital bone. the mastoid portion of the temporal bone. In the adult, it lies 4 cm behind and 12 mm above the center of the entrance to ...
The tympanic antrum is bounded above by a thin plate of bone, the tegmen tympani, which separates it from the middle fossa of the base of the skull, below by the mastoid process, laterally by the squama just below the temporal line, and medially by the lateral semicircular canal of the internal ear, which projects into its cavity.
The inner surface of the occipital bone is marked by dividing lines as shallow ridges, that form four fossae or depressions. The lines are called the cruciform (cross-shaped) eminence . At the midpoint where the lines intersect a raised part is formed called the internal occipital protuberance .