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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 occipital bone (/ ˌ ɒ k ˈ s ɪ p ɪ t əl /) is a cranial dermal bone and the main bone of the occiput (back and lower part of the skull).It is trapezoidal in shape and curved on itself like a shallow dish.
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 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.
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 upper, often faintly marked, is named the highest nuchal line, and to it the epicranial aponeurosis is attached. The lower is termed the superior nuchal line. That area of the squamous part, which lies above the highest nuchal lines is named the occipital plane (planum occipitale) and is covered by the occipitalis muscle.
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 calvaria is made up of the superior portions of the frontal bone, occipital bone, and parietal bones. [1] In the human skull, the sutures between the bones normally remain flexible during the first few years of postnatal development, and fontanelles are palpable. Premature complete ossification of these sutures is called craniosynostosis.