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The parietal eminence (parietal boss, parietal tuber, parietal tuberosity) is a convex, smooth eminence on the external surface of the parietal bone of the skull.It is the site where intramembranous ossification of the parietal bone begins during embryological development.
The parietal bone is ossified in membrane from a single center, which appears at the parietal eminence about the eighth week of fetal development. Ossification gradually extends in a radial manner from the center toward the margins of the bone; the angles are consequently the parts last formed, and it is here that the fontanelles exist.
Skull in situ Human head skull from side Anatomy of a flat bone – the periosteum of the neurocranium is known as the pericranium Human skull from the front Side bones of skull. The human skull is the bone structure that forms the head in the human skeleton. It supports the structures of the face and forms a cavity for the brain. Like the ...
Parietal branch of superficial temporal artery, curves upward and backward on the side of the head; Parietal-temporal-occipital (PTO), includes portions of the parietal, temporal, and occipital lobes; Parietal bone, of the skull Parietal foramen (disambiguation) Parietal eminence, external surface of the parietal bone
Medial eminence, in the rhomboid fossa of the fourth ventricle of the brain; Median eminence, below the hypothalamus of the brain; Müllerian eminence, in the cloaca of an embryo; Parietal eminence, in the parietal bone of the skull; Pyramidal eminence, in the middle ear; Thenar eminence, muscle on the thumb side of the hand
A parietal foramen is an opening in the skull for the parietal emissary vein, which drains into the superior sagittal sinus. Occasionally, a small branch of the occipital artery can also pass through it. Each foramen is located at the back part of the parietal bone, close to the upper or sagittal border.
In the occipital bone, the lower division of the cruciate eminence is prominent, and is named the internal occipital crest; it bifurcates near the foramen magnum and gives attachment to the falx cerebelli; in the attached margin of this falx is the occipital sinus, which is sometimes duplicated.
The inion is the most prominent projection of the protuberance which is located at the posterioinferior (rear lower) part of the human skull. The nuchal ligament and trapezius muscle attach to it. The inion (ἰνίον, iníon, Greek for the occipital bone) is used as a landmark in the 10-20 system in electroencephalography (EEG) recording.