ANGIOLOGY 



239 



right receives some blood from the left head region indicating that 

 the blood flows from left to right. This, as stated before, makes the 

 left jugular vein the smaller. 



Branches of the Vena Cephalica Posterior 



The left vena cephahca posterior (Fig. 62, No. B, 8) communicates 

 with the transverse vein (Fig. 62, No. B, 5). The left receives the 

 smaller veins of the skin region, the esophagus, and the trachea. 

 These vessels communicate with their fellow of the opposite side 

 and with the vertebral vein of the same side, which causes a gradual 

 reduction of the size of the jugular vein. 



' BRANCHES OF THE VENA OCCIPITALIS EXTERNUS 



Sinus 

 venosus 

 annularis 

 feasilaris 



Sinus petrosus sphenoideus f Retis mirabile temporalis 

 Sinus temporo-sphenoideus [ Sinus annularis venosus basilaris 

 Sinus f oraminus occipitalis ( Venae medullares 



Venae cerebrales 



Vena cerebralis basilaris 



Sinus venosus annularis anterior 



Vena ophthalmica 



Vena medullaris mediana longitudinalis 



The vena cephahca posterior (Fig. 62, No. B, 8) is formed from 

 the veins of the sinuses of the cranium, the brain, the vena auris, 

 the vena jugularis prima, the vena carotis, and the vena occipitalis. 

 It collects most of the blood from the cranium and the posterior part 

 of the head and from the tongue. 



THE VENOUS SINUSES OF THE HEAD 



The sinus longitudinalis (Fig. 62, A, 10) extends from the dorsal 

 median hne of the internal occipital protuberance to the olfactory 



