208 HUMAN ANATOMY. 



The circular sinus is formed by two small vessels passing 

 in front of and behind the pituitary body, and connecting the 

 cavernous sinuses. 



The inferior petrosal sinus on each side runs in a groove 

 between the petrous portion of the temporal bone and the basilar 

 portion of the occipital, connecting the cavernous sinuses with 

 the lateral sinuses. 



The superior petrosal sinus on each side passes along the 

 upper border of the petrous portion of the temporal bone, con- 

 necting the cavernous with the lateral sinuses above. 



The transverse sinus is a small, straight sinus, connecting 

 the inferior petrosal and cavernous sinuses. 



CEREBKAL VEINS. The cerebral veins consist of two sets 

 the superficial, on the surface, and the deep, within the substance. 

 They include: 



Superficial 



Superior cerebral veins, Inferior cerebral veins. 



Deep 



Ventricular veins, or venae Veni corporis striati, 



Galeni, Choroid vein. 



The cerebellar veins consist of the superior, inferior, and 

 lateral. 



DIPLOIC AND MENINGEAL VEINS. The diploic veins, five 

 in number, frontal, anterior temporal, posterior temporal, 

 occipital, communicate with the sinuses of the brain and with 

 the veins of the dura mater, the scalp, and orbit. 



The meningeal veins follow the course of the corresponding 

 arteries, two accompanying each vessel through its course, and 

 open into the sinuses of the dura mater. 



The great meningeal veins terminate either in the cavernous 

 sinuses or by emptying into the internal maxillary vein. 



The ophthalmic vein commences at the internal canthus of 

 the eye in an anastomosis with the facial, passes backward along 

 the inner part of the orbit, through the sphenoidal fissure, to 

 empty into the cavernous sinuses. 



The external jugular vein, smaller than the internal jugular, 

 is formed by the union of the posterior auricular with the tern- 

 poro-maxillary veins; or it may be formed by union with the 

 facial. It descends beneath the platysma muscle from the angle 

 of the jaw to the middle of the clavicle, where it terminates by 



emptying into the "Bubclavian. It receives the following veins : 





 Anterior jugular, Suprascapular, 



jugular, Tran^er^e, cervical, 



