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BLOOD-VESSEL SYSTEM OF THE HEAD, ETC. 225
gland, and are distributed to the stylo-hyoid, internal pterygoid, and
masseter muscles.
llie Submental Artery is the largest and most important of the cervi-
cal branches of the facial artery. It arises at a point between the
submaxillary gland and the position of the facial artery as it turns
upward across the body of the jaw to reach the face. Occasionally it
it extends in a continuous line from
arises from the sublingual artery ;
the facial artery below the base of the jaw to its symphysis, where the
artery turns upward to the chin, supplying the muscles of this region
and anastomosing with the inferior labial and mental arteries and its
fellow of the opposite side. The mylo-hyoid muscle is situated on its
inner side, branches of the artery perforating the muscle and anastomos-
ing with the sublingual artery. In its course it distributes branches to
the neighboring tissues.
The Inferior Labial Artery is the first of the facial branches of the
facial artery. It arises soon after the artery reaches the face, and passes
forward beneath the depressor anguli oris muscle. Its branches are
distributed to the integument and muscles of the lower lip, and
anastomose with the inferior coronary, submental, and mental arteries.
The Inferior Coronary Artery supplies the lower lip. It arises at
the outer margin of the depressor anguli oris muscle, a little below the
level of the angle of the mouth, passes a short distance upward and
inward beneath the depressor anguli oris, depressor menti, and the
orbicularis oris muscles, and between the latter muscle and the mucous
membrane close to the free margin of the lip. Its branches supply the
muscles and mucous membrane of this region and the labial glands,
anastomosing, with its fellow of the opposite side, with the inferior
labial, and the mental branch of the inferior dental artery.
The Superior Coronary Artery supplies the upper lip and arises
beneath the zygomaticus major muscle. It is larger and more tortuous
than the inferior coronary, and passes transversely between the mus-
cles and mucous membrane of the upper lip close to its free margin,
inosculating with the corresponding artery of the opposite side. It
supplies the muscles, mucous membrane, and labial glands of the upper
lip, and gives oif two or three branches which pass to the nose. One,
the artery of the septum, passes along the columna nasi as far as the
tip of the nose, and supplies the septum. Another branch supplies the
alse of the nose.
The inferior and su])erior coronary arteries occasionally arise as a
common trunk. If either or both are smaller than is generally the
case, the arteries of the opposite side are correspondingly increased in
size. It is by reason of their free anastomosis, with each other that
they receive the name "coronary arteries," though this anastomosis is
not always present.
The Lateral Nasal Artery arises from the facial as it ascends along
the side of the nose. Occasionally this artery is replaced by two or
three smaller arteries. The branches of the lateral nasal supply the
wing and dorsum of the nose, and anastomose with the nasal branch of
the ophthalmic, infraorbital, artery of the septum, and corresponding
artery of the opposite side.
Vol. I.— 1
BLOOD-VESSEL SYSTEM OF THE HEAD, ETC. 225
gland, and are distributed to the stylo-hyoid, internal pterygoid, and
masseter muscles.
llie Submental Artery is the largest and most important of the cervi-
cal branches of the facial artery. It arises at a point between the
submaxillary gland and the position of the facial artery as it turns
upward across the body of the jaw to reach the face. Occasionally it
it extends in a continuous line from
arises from the sublingual artery ;
the facial artery below the base of the jaw to its symphysis, where the
artery turns upward to the chin, supplying the muscles of this region
and anastomosing with the inferior labial and mental arteries and its
fellow of the opposite side. The mylo-hyoid muscle is situated on its
inner side, branches of the artery perforating the muscle and anastomos-
ing with the sublingual artery. In its course it distributes branches to
the neighboring tissues.
The Inferior Labial Artery is the first of the facial branches of the
facial artery. It arises soon after the artery reaches the face, and passes
forward beneath the depressor anguli oris muscle. Its branches are
distributed to the integument and muscles of the lower lip, and
anastomose with the inferior coronary, submental, and mental arteries.
The Inferior Coronary Artery supplies the lower lip. It arises at
the outer margin of the depressor anguli oris muscle, a little below the
level of the angle of the mouth, passes a short distance upward and
inward beneath the depressor anguli oris, depressor menti, and the
orbicularis oris muscles, and between the latter muscle and the mucous
membrane close to the free margin of the lip. Its branches supply the
muscles and mucous membrane of this region and the labial glands,
anastomosing, with its fellow of the opposite side, with the inferior
labial, and the mental branch of the inferior dental artery.
The Superior Coronary Artery supplies the upper lip and arises
beneath the zygomaticus major muscle. It is larger and more tortuous
than the inferior coronary, and passes transversely between the mus-
cles and mucous membrane of the upper lip close to its free margin,
inosculating with the corresponding artery of the opposite side. It
supplies the muscles, mucous membrane, and labial glands of the upper
lip, and gives oif two or three branches which pass to the nose. One,
the artery of the septum, passes along the columna nasi as far as the
tip of the nose, and supplies the septum. Another branch supplies the
alse of the nose.
The inferior and su])erior coronary arteries occasionally arise as a
common trunk. If either or both are smaller than is generally the
case, the arteries of the opposite side are correspondingly increased in
size. It is by reason of their free anastomosis, with each other that
they receive the name "coronary arteries," though this anastomosis is
not always present.
The Lateral Nasal Artery arises from the facial as it ascends along
the side of the nose. Occasionally this artery is replaced by two or
three smaller arteries. The branches of the lateral nasal supply the
wing and dorsum of the nose, and anastomose with the nasal branch of
the ophthalmic, infraorbital, artery of the septum, and corresponding
artery of the opposite side.
Vol. I.— 1
