THE VEINS. : 323 
V. facialis profunda (Fig. 131, %).—The deep facial vein 
enters the anterior facial from beneath the masseter, just caudad 
of the angle of the mouth. It collects branches from the soft 
and hard palates and the teeth, these branches passing along 
with the corresponding arteries for a distance, then uniting and 
passing ventrolaterad beneath the zygomatic arch to join the 
anterior facial. The deep facial vein also receives branches 
which come from the venous plexus that lies in the same region 
as the arterial carotid plexus. 
V. submentalis (Fig. 131, /).—This enters the anterior 
facial vein at the ventral border of the masseter muscle and 
near the cranial end of the two superficial lymph-glands (12) 
in this region. The submental vein is formed at the dorsal 
border of the digastric muscle by two branches emerging from 
between the digastric and the mandible. The more cranial 
of these, V. lingualis, collects branches from the tongue, 
from its middle to the tip; it passes through the middle of the 
lateral border of the mylohyoid muscle to join the other branch. 
The second branch emerges from between the mandible and 
the pterygoid muscles. It comes from near the caudal end of 
the mandible, where it becomes continuous with a communi- 
cating branch from the posterior facial vein, and receives a 
branch which comes from the mandibular canal; also small 
branches from the adjacent parts. 
e. V. facialis posterior (Fig. 131, 4).—The posterior facial 
vein arises from the region of the internal maxillary artery, its 
terminal branches following the branches of the artery. It 
collects blood from the pterygoid, masseter (9), and termporal _ 
muscles, and forms a: plexus which is interwoven with the 
carotid (arterial) plexus in the region of the orbital fissure. It 
is connected with the submental vein by a communicating 
branch. From the posterior facial a branch extends ventrad 
close against the outer surface of the tympanic bulla and then 
turns caudad, receives a branch from the pharynx, then con- 
tinues to join the internal jugular. The posterior facial itself 
passes laterad along the caudal border of the masseter (9) and 
the ventral border of the parotid gland (10), then becomes 
superficial and turns ventrad over the outer surface of the sub- 
