THE VEINS. 



245 



, Gruby), (Figs. 160, 161, and 162 c.m.}. This vein 

 arises by small branches in the head ; these are : 



a. The Vena nasatis ( Virchow) ; it arises by an upper and a lower 

 branch from around the nostril, and courses backwards along the 

 superior maxillary bone to about the middle of the orbit, where it 

 joins the facial vein. 



/3. The Vena orbitalis anterior (Virchow),, ( Vena op/it/iatmica ante- 

 rior, Ecker), (Fig. 1600) commences at the Harderian gland from a 

 rich anastomosis, 



receives branches Fig. 162. 



from the floor and 

 anterior wall of the 

 orbit, and joins the 

 facial vein with the 

 Vena nasalis. 



y. The Vena orbi- 

 talis posterior (Vir- 

 chow), ( Vena oph- 

 t ha! mica posterior, 

 Ecker), (Fig. 1 60 0} 

 arises on the pos- 

 terior wall of the 



orbit on the J/. pferyyoiileu.* ; it passes under the Processns zygoma- 

 ticus to join the facial vein, and in its course receives the Vena 

 oplitlialmica (see eye), and communicates with the 7 eua orlitalis 

 medialis and the internal jugular vein. 



8. The Vena facialis (Fig. 160) is formed about the middle 

 of the orbit by the union of the Vena nasalis and the Vena orlitalis 

 anterior ; it courses, backwards towards the angle of the jaw. On 

 reaching the 31. depressor maxillae, about 4 mm. in front of the 

 angle of the jaw, it passes on to the skin. It receives in its 

 course the Venae palfebrale* (Fig. 162) and the Vena orlitalis 

 posterior. 



The musculo-cutaneous vein is the direct continuation of the 

 Vena facia? is after this has left the upper jaw ; it immediately 

 receives one or more twigs (Venae tympanicae)^ (Fig. 162) from the 

 tympanic membrane and the tympanic cavity. 



The vein then courses backwards in the outer wall of the lateral 

 lymph-sac as far as the middle of the trunk, where it passes, by 

 means of the Septum aMominale, to the outer border of the Portia 



Coarse of tbe cutaneous vein as seen from the side. 



f.wt. Cutaneous vein. 



d M. depressor maxillae. 



M. infraspinatus. 



