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BLOOD-VESSEL SYSTEM OF THE HEAD, ETC. 251

the eyebrow and terminates in the angular vein. The right and left
frontal veins occasionally communicate with each other, or they may
unite to form a single trunk, separating again into two branches.
The Supraorbital 1 Yin is much smaller than the frontal. It is ibrmed
by the union of small branches from the forehead, eyebrow, and eyelid,
and inosculates with the temporal and ophthalmic veins, uniting with
the frontal to form the angular vein.
The Inferior Palpebral Veins of either side originate in the lower
eyelid, being formed by branches from adjacent parts anastomosing with
the infraorbital veins. They terminate by emptying into the upper
portion of the facial vein.
The Superior Labial Vein commences in a plexus situated in the
upper lip, and anastomoses with the corresponding veins of the opposite
side. It passes outward and upward, and enters the facial vein on a
level with the ala of the nose.
The Deep Facial or Anterior Internal Maxillary Vein is of large
size, and originates in the pterygoid plexus formed by the internal
maxillary veins. It passes forward and downward in close apposition
to the zygomatic surface of the superior maxillary bone, and terminates
beneath the malar bone in the anterior facial vein.
Tlie Buccal, Masseteric, and Farotid Veins are small branches that
originate in the structures indicated by their names. They terminate
by emptying into the lateral surface of the facial vein.
The Submental Vein is formed by branches which originate in the
submental region. It passes backward along the base of the inferior
maxillary bone, and terminates by emptying into the facial vein just as
that vessel curves under the jaw. Its anterior branch connnunicates
with the anterior jugular vein, and receives branches which come from
the region of the submaxillary gland and the mylo-hyoid nniscle.
The SubmcLvillar'i/ Veins originate in the submaxillary muco-salivary
gland, and terminate either in the facial or submental vein.
The Inferior Palatine Vein originates in the structures in and about
the tonsils and soft palate. It passes downward in close proximity to
the ]:)harynx, and generally terminates by emptying into the facial vein.
The following is from Allen's Human Anatomy, p. 417 :
" It will be seen that the venous supply of the face differs in some
important particulars from that of the truidv and limbs. In the last-
named localities both deep and superficial currents flow in the same
direction toward the heart. The facial trunk, however, is not formed
by primal venules, as is commonly the case, but by branches communi-
catino; with the frontal and supraorbital veins, and by a transverse
branch found at the bridge of the nose. It is highly probable that
much of the blood of the interorbital space and of the locality about
the inner canthus of the eye flows through the orbital conduits to the
cavernous sinus. Farther down the face it is seen that the infraorbital
artery alone of all the vessels of the face possesses vense comites. These
jjroniptly join the orbital set of veins or aid in swelling the volume of
the internal maxillary vein. The veins corresponding to the deep parts
of the face, other than those mentioned, also seek an outlet in the same
trunk, so that much of the superficial blood of the upper part and side