THE VESSELS. 339 



the lower jaw to one inch beneath its angle. Position : at the angle of 

 the eye, as ven. angularis, before the lig. palpebr. intern.; then between 

 levat. iabii alceq, nasi and orbicul. palpebr.; upon levator labii super, and 

 buccinat., under the zygomatici ; beneath the lower jaw upon gland, sub- 

 maxillaris. Branches : 



1. V. frontalis, between the skin and m. frontalis, near the central 

 line of the forehead, to the root of the nose. 



2. V. supraorbitalis, between m. corrugator and frontalis, from without 

 inwards, anastomoses with vv. temporales ; with v. frontalis over lig. 

 palpebr. intern. ; receives v. diploica frontal. 



3. V. ophtkalmica, passes backwards from the v. angularis between lig. 

 palpebr. int. and trochlea, on the inner wall of the Orbita, then over 

 N. opticus, leaves the art. ophthalm., and passes, at the internal boun- 

 dary oifissur. orbital, super., into the sinus cavernosus. It receives : 

 v. sacci lacrymal., ethmoidal. anter. and poster., ciliar. long, andvorti- 

 cosae, lacrymalis, central, retinas ; lastly: 



v. ophthalmica inferior, which lies on the floor of the orbit, formed 

 of vv. muscular es and ciliares inferior., likewise anastomosing 

 through jissura orbit, infer, with ram. prof und. v. facial, anter. 



4. Vv. nasales, from the back (dorsales) and alee of the nose (pinnules s. 

 alares.) * 



5. Vv. palpebrales inferior es and labiales superior es. 



6. Ramus profundus s. facialis profunda unites the v. facial, with v. 

 maxillar. interna and ophthalmica; arises from a plexus which is 

 formed by v. ophthalm. infer., nasalis poster., dentalis superior, upon 

 the posterior surface of the upper jaw, is connected with plex. 

 pterygoid., and opens below the proc. zygomatic. of the upper jaw. 



7. Vv. labiales inferiores, buccales, massetericce, submentalis, sub- 

 maxillar es. 



8. V. palatina arises in the soft palate and from plex. tonsillaris ; also 

 open into cephalica interna. 



b. Vena facialis posterior. Origin : inside the parotis behind collumcon- 

 dylimaxill. infer., from v. temporalis and maxillaris interna. Position: 

 on the inner side of carotis externa. Course : behind the ram us of the 

 lower jaw: united at an angle with F. facialis anter. It frequently 

 opens, as it passes away before sterno-mastoideus into V. jugularis externa, 

 and sends a large uniting branch, over m. digastricus, to V. jugularis in- 

 terna. Branches : 



1. V. temporalis communis passes backwards from art. temporalis, be- 

 tween the meatus auditor, externus and the maxillary articulation 

 under the skin, and enters the parotis ; unites behind collum con- 

 dyli, with V. maxillaris interna ; consists of: 



a. Temporales superjiciales ; these are branches which pass from 

 a rete with wide meshes from the forehead, vertex and occiput 



