288 



THE VASCULAR SYSTEMS 



sinus receives the superior petrosal sinus and emissary veins 

 from the mastoid and posterior condylar foramina, as well as 

 some cerebellar, diploic, and posterior cerebral veins. 



5. Occipital sinus, small, sometimes double, is contained in the 

 falx cerebelli, and opens into the torcular above and the lateral 

 sinus below by a branch on each side of the foramen magnum. 

 It receives some cerebellar veins and branches from the posterior 

 spinal veins. 



FIG. 47 



Torcular herophili. 



Foramen ceciim. 



Vertical section of the skull, showing the sinuses of the dura mater. 



6. The cavernous sinuses, one on each side of the body of the 

 sphenoid, run from the sphenoidal fissure to the apex of the 

 petrous portion of the temporal, receiving the ophthalmic veins 

 in front and joining the petrosal sinuses behind. It receives the 

 sphenoparietal sinus, some inferior cerebral veins, and is joined 

 with the opposite vessel by the circular sinus. 



7. The circular sinus consists of the anterior and posterior 

 intercavernous sinuses, which join at each end the cavernous 

 sinuses, thus surrounding the pituitary body. 



8. The superior petrosal sinus runs from the cavernous sinus, 

 along the upper border of the petrous portion of the temporal, 



