Veins. 



239 



C'onfluens xitiuum 

 s.Torcular Hervphili 



588. The Sinuses of the Dura Mater. Seen from above. 



The internal jugular vein passes out by the jugular foramen, where 

 it forms a dilatation, the sinus or Bulbus superior; it receives the pharyngeal 

 veins, often a lingual vein. In the jugular foramen it is connected with the 

 transverse sinus. 



Of the sinuses of the dura mater some are double, one on each side, 

 some single. 



1. The largest single sinus is called the Confluens sinuum s. Torcular 

 Herophili; it lies in front of the internal occipital protuberance and is the point 

 of meeting of all the sinuses. 2. The transverse sinus is double. 3. The 

 superior longitudinal sinus, Sinus faldformis major, occupies the attached 

 margin of the Falx cerebri. 4. The inferior longitudinal sinus, Sinus fald- 

 formis minor, is contained in the posterior part of the free margin of the Falx 

 cerebri. 5. The straight sinus (rectus) passes obliquely backwards. 6. The two 

 cavernous sinuses at the sides of the Sella turdca; their continuations 

 are the Sinus alae parvae, both of which are connected by means of the 

 circular sinus, Sinus drcularis Ridlei. 7. The superior petrosal sinuses 

 are situated along the upper border of the petrous portions of the temporal bones. 

 8. The inferior petrosal sinuses situated in the groove formed by the 

 junction of the inferior border of the petrous bone with the basilar process of 

 the occipital. 9. The occipital sinus surrounds the Foramen magnum. 



