104 OSTEOLOGY. 
also affords origin to the temporal muscle, and is often faintly marked by grooves 
which indicate the course of the middle temporal artery. 
Above the superior temporal line the bone is covered only by the tissues of the 
scalp. Near its upper border, and about an inch from its posterior superior angle, 
is the small parietal foramen (foramen parietale), through which pass a small 
arteriole and an emissary vein. 
The inner or cerebral aspect is concave from side to side and from above down- 
wards, moulded over the surface of portions of the frontal, parietal, occipital, and 
temporal lobes of the cerebrum, it displays impressions corresponding to the arrange- 
ment of the convolutions of these portions of the brain. It also presents a series 
of well-marked grooves for the lodgment of the branches of the middle meningeal 
artery ; these radiate from the anterior inferior angle of the bone, the best marked 
running upwards at some little distance behind and parallel to its anterior border. 
Within the upper margin are a series of depressions for Pacchionian bodies, 
and here also the bone is channelled so as to form a groove (sulcus sagittalis), 
Parietal eminence 
Superior temporal line 
Parietal 
foramen 
i Anterior 
wie_inferior 
Wy angle 
For articulation with 
creat wing of sphenoid 
For articulation 
with occipital 
For articulation with 
squamous temporal 
or articulation with mastoid-temporal 
Fria. 80.—RIGHT PARIETAL BoNE (Outer Side). 
which is completed by articulation with its fellow of the opposite side. Within 
this groove lies the superior longitudinal venous sinus, and to its edges the falx cerebri 
is attached. Close to the inferior posterior angle there is also a curved groove, the 
lateral sulcus, in which the lateral venous sinus is lodged. 
The anterior, superior, and posterior borders are deeply serrated. The anterior 
articulates with the frontal bone, and constitutes the coronal suture; the posterior is 
united with the occipital bone, and forms the lambdoid suture. The superior border 
articulates with its fellow of the opposite side by means of the sagittal suture; in 
the interval between the two parietal foramina this suture is usually simple in its 
outline. The anterior superior angle (angulus frontalis) is almost rectangular, and 
corresponds to the site of the anterior fontanelle. The posterior superior angle 
(angulus occipitalis), usually more or less rounded, corresponds in position to the 
posterior fontanelle. The inferior border is curved, and shorter than the others, it 
lies between the anterior and posterior inferior angles. Sharp and bevelled at the 
expense of its outer table, it displays a fluted arrangement, and articulates with 
the squamous part of the temporal bone. The anterior inferior angle (angulus 
