98 THE POCKET ANATOMY 



caecum with nasal veins, runs back in upper border of falx 

 cerebri to torcular Herophili, usually joining right lateral 

 sinus ; receives superior cerebral, parietal and emissary veins. 

 Intersected by fibrous bands, the chordae Willisii ; the lumen 

 is triangular, and on either side lie the Pacchionian bodies. 



Inferior longitudinal : along posterior | of free margin of falx 

 cerebri to straight sinus. 



Straight : is placed at junction of tentorium and falx cerebri, 

 goes to torcular Herophili, ending usually in left lateral sinus ; 

 receives "inferior longitudinal sinus, vena magna Galeni, 

 inferior median cerebral, and superior cerebellar veins. 



Lateral (2) : from torcular Herophili to foramen lacerum pos- 

 terius, empties into internal jugular vein, each receives superior 

 petrosal and occipital sinuses, and mastoid vein : the right 

 also receives the superior longitudinal and the left the straight 

 sinus. Joins inferior petrosal sinus to form internal jugular 

 vein below jugular foramen. 



Occipital (2) : smallest ; from posterior margin of foramen 

 magnum to torcular Herophili. 



Cavernous (2) : by side of sella turcica, passes from sphe- 

 noidal fissure to apex of petrous part of temporal. Receives 

 ophthalmic veins which connect the angular vein with this 

 sinus ; also anterior inferior cerebral veins and sinus alae 

 parvae. The ophthalmic veins are two in number : superior, 

 the larger, accompanies artery ; and inferior, running below 

 optic nerve, is formed by lower ciliary and muscular branches, 

 and communicates with pterygoid plexus ; both pass through 

 the sphenoidal fissure to empty into the cavernous sinus. 



Circular : surrounds pituitary body, connects the cavernous 

 sinuses. 



Inferior petrosal (2) : from termination of cavernous to in- 

 ternal jugular vein, lies over petro-occipital suture. 



Transverse : connects the inferior petrosal sinuses across 

 basilar process of occipital bone. 



Superior petrosal (2) : placed on superior border of petrous 

 part of temporal, connecting lateral and cavernous sinuses ; 

 receives inferior lateral cerebral, and anterior lateral cere- 

 bellar veins. 



Sinus alee parva (spheno-parietal) receives some meningeal 

 \nd inferior cerebral veins, and runs inwards along free 

 nargin of lesser wing of sphenoid to cavernous sinus. 



Veins of the diploe : lodged in channels of the bones of the 

 cranial vault. They are divided into frontal, joining the 

 supra-orbital vein ; anterior temporal, joining a deep temporal 

 vein ; posterior temporal, joining lateral sinus ; and occipital. 

 joining occipital vein or lateral sinus. 



