202 LABORATORY MANUAL OF HUMAN ANATOMY 



transverse sinus (sinus transversus) (0. T. lateral sinus) and the 

 superior petrosal sinus (sinus petrosus superior). 



(b) Falx cerebelli. 



Note the relation of the occipital sinus to this membrane. 



(c) Diaphragma sellae. 



In connection with the dura mater at the base of the skull, the 

 entrance and exit of the various cerebral nerves (Nn. cer eh rales) 

 (0. T. cranial nerves) should be carefully studied. 



Sinuses of the Dura Mater. (Vide Spalteholz, Figs. 483 and 484.) 



These venous sinuses (sinus durae matris) should now be 

 systematically examined. Open each throughout its length with 

 a knife having a sharp point. Study them in the following order : 



(a) Transverse sinus (sinus transversus) (0. T. lateral sinus). 



Examine its course exactly and note its relations to the 

 exterior of the skull. It is of very great practical impor- 

 tance to the physician and surgeon, not infrequently 

 becoming infected as a sequel of inflammation of the cel- 

 lulae rnastoideae. 



(aa) Confluence of the sinuses (confluens sinuum) (0. T. torcular 



Herophili). 



(ab) Internal auditory veins (Vv. auditivae internae). 



(b) Occipital sinus (sinus occipitalis). 



(c) Superior sagittal sinus (sinus sagittalis superior) (0. T. superior 



longitudinal sinus). 



(d) Inferior sagittal sinus (sinus sagittalis inferior) (0. T. inferior 



longitudinal sinus). 



(e) Straight sinus (sinus rectus). 



Note that it receives the V. cerebri magna [Galeni]. 

 (/) Inferior petrosal sinus (sinus petrosus inferior). 



How does it leave the skull? Into what does it empty? 

 (g) Superior petrosal sinus (sinus petrosus superior), 

 (h) Cavernous sinus (sinus cavernosus). 



Leave this unopened at present; it will be thoroughly studied 

 subsequently. 



It receives the Vv. ophthalmicae superior et inferior and the 

 sinus sphenoparietalis. 



(i) Anterior and posterior intercavernous sinuses (sinus cavernosus ante- 

 rior et posterior). 



These together with the two cavernous sinuses constitute the 

 circular sinus (sinus circularis). 



(j) Sphenoparietal sinus (sinus sphenoparietalis) (0. T. sinus alae 

 parvae). 



Note that it receives one V. meningea media, the Vv. cerebri 

 inferiores, the V. ophthalmomeningea, and frequently the V. 

 diploica temporalis anterior. 



Certain veins should be studied at this juncture. 



