Commencing at the foramen cecum, through which it receives emissary veins from the nasal cavity, it runs from anterior to posterior, grooving the inner surface of the frontal, the adjacent margins of the two parietal lobes, and the<unk>  division of the cruciate eminence of the occipital lobe. Near the internal occipital protuberance, it drains into the confluence of sinuses and deviates to either side (usually the right). At this point it is continued as the corresponding transverse sinus. The<unk>  is usually divided into three parts: anterior (foramen cecum to bregma), middle (bregma to lambda), posterior (lambda to confluence). It is triangular in section, narrow in front, and gradually increases in size as it passes backward. Its inner surface presents the openings of the<unk>  cerebral veins, which run, for the most part, obliquely forward, and open chiefly at the back part of the sinus, their orifices being concealed by fibrous folds; numerous fibrous bands (chordae Willisii) extend transversely across the inferior angle of the sinus; and, lastly, small openings communicate with irregularly shaped venous spaces (venous lacunae) in the dura mater near the sinus. There are usually three lacunae on either side of the sinus: a small frontal, a large parietal, and an occipital, intermediate in size between the other two. Most of the cerebral veins from the outer surface of the hemisphere open into these lacunæ, and numerous arachnoid granulations (Pacchionian bodies) project into them from below. The<unk>  receives the<unk>  cerebral veins, veins from the diploë and dura mater, and, near the posterior extremity of the<unk>  suture, veins from the pericranium, which pass through the parietal foramina.
Superior sagittal sinus
Inferior sagittal sinus
Transverse sinuses
Collateral fissure
Canine fossa
Rhomboid fossa
Optic recess
Suboccipital triangle