![]() ![]() Animation stops for a few seconds at inner and outer surface. In the groove is the internal opening of the parietal foramen when that aperture exists. Near the groove are several depressions, best marked in the skulls of old persons, for the arachnoid granulations (Pacchionian bodies). The internal surface is concave it presents depressions corresponding to the cerebral convolutions, and numerous furrows (grooves) for the ramifications of the middle meningeal artery the latter run upward and backward from the sphenoidal angle, and from the central and posterior part of the squamous border.Īlong the upper margin is a shallow groove, which, together with that on the opposite parietal, forms a channel, the sagittal sulcus, for the superior sagittal sinus the edges of the sulcus afford attachment to the falx cerebri. The external surface is convex, smooth, and marked near the center by an eminence, the parietal eminence ( tuber parietale), which indicates the point where ossification commenced.Ĭrossing the middle of the bone in an arched direction are two curved lines, the superior and inferior temporal lines the former gives attachment to the temporal fascia, and the latter indicates the upper limit of the muscular origin of the temporal muscle.Ībove these lines the bone is covered by a tough layer of fibrous tissue – the epicranial aponeurosis below them it forms part of the temporal fossa, and affords attachment to the temporal muscle.Īt the back part and close to the upper or sagittal border is the parietal foramen which transmits a vein to the superior sagittal sinus, and sometimes a small branch of the occipital artery it is not constantly present, and its size varies considerably. It is named from the Latin paries ( -ietis), wall. ![]() In humans, each bone is roughly quadrilateral in form, and has two surfaces, four borders, and four angles. ɪ t əl/) are two bones in the skull which, when joined at a fibrous joint, form the sides and roof of the cranium. ![]()
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