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102 ANATOMY

buccinator muscle of the cheek and the superior constrictor muscle of
the pharynx have slight attachments.
The Siq^erior Portion is situated within the mouth, and Ls covered by
mucous membrane and muco-periosteum.
The Inferior Portion is all that surface of bone below the mylo-hyoid
ridge. It is situated below the floor of the mouth, and is covered by
periosteum.
The Genial Tubercles are situated at the lower portion of the median
line of the bone. They are four in number, two on each side. Occa-
sionally, these tubercles are indistinct, and sometimes they unite and form
one tubercle. The superior pair aflbrd
Fig. 49. origin to the genio-hyo-glossi mus-
.tV^.., cles, the lower pair to the genio-
hyoidei muscles.
The Sublingual Fossa is an oval
depression, posterior to the genial
tubercle, below the cuspid teeth and
above the mylo-hyoid ridge. This

CENtO-HYO-GLOSSUS
CENIO-HYOIDEUS
Mula-hyoid Ridge
B o dy
Inferior Slaxillary Eone, inner surface, side view.
fossa supports the anterior border of the sublingual gland. It is wider
behind than in front.
The T)ir/astrio Fossa is a depression for the insertion of the digastric
muscle. It is situated at the anterior portion of the internal surface of
the bone, near the symphysis and tlie lower border of the inferior maxilla.
The Subinaxillart/ Fossa is an oblong depression, wider behind than in
front, situated near the centre of the internal surface and between the
mvlo-hvoid ridge and the lower border of the bone. In it rests the
external surface of the submaxillary muco-salivary gland.
The 3Ij/lo-Jii/oi(J (rroore is situated beneath the mylo-hyoid ridge, com-
mencing at the posterior (inferior) dental canal. This groove accommo-
dates the mylo-hyoid nerve, artery, and vein as they pass to the floor of
the mouth.
The Superior Border of the bone extends from the ramus of one
side to the same point on the otlier. It is situated on that portion
of the bone analogous to the alveolar process of the superior maxilla.