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296 ANATOiMY.
fibres of the tongue, divide into finer filaments, which are distributed
to the mucous membrane of the anterior two-thirds of the tongue and
terminate in the conical and fungiform papillae.
A few jAcxifonn jilaiiicnts, which pass beneath the tongue, some ter-
minating on the under surface of the tip and in the glands of Niihn.
The Inferior Dental Nerve.
The Inferior Dental Nerve is the largest of the branches of the third
or inferior maxillary division of the fifth nerve (Fig, 145). From its
origin it passes downward,
V\a. 145.
accompanied by the inferior
dental artery, on the inter-
nal surface of the external
pterygoid muscle posterior
and a little to the side of
the lingual nerve. After
reaching the lower border
of the external pterygoid
muscle it passes between the
lateral ligament and the ra-
mus of the jaw, and enters
the inferior dental canal
through the posterior den-
tal foramen. It then j^asses
through this canal, and ter-
minates opposite the an-
terior or mental foramen
by dividing into incisor
and mental branches.
The branches of the in-
ferior dental nerve are
Pterygo-maxillary Region ami Fifth Nerve: 1, temporal fas-
cia; 2, temporal imi.scle ; '.i, temporal branches of auriculo- A Communicating
temporal nerve; 4, deep temporal branch of buccinator Branch, which passes over
nerve; o, deei> temporal nerves; (>, jiterygoideus externus;
7, deep temporal l)ranch of masseteric nerve (inconstant) the internal maxillary ar-
8, buccinator (or long buccal) nerve (fifth); 9, masseteric
nerve; 10, buccal briinch of seventh; 11, auriculo-temporal tery to the lingual nerve.
nerve; IJ, lingual nerve; i:*, facial nerve (seventh) at stylo-
mastoid foramen; 11, buccinator muscle; ll, pterygoideus A 3Ij/lo-hi/oid Branch,
internus; 16, supramaxillary branch of seventh; 17, infe- which generally de-
rior dental nerve; IS, its mental branches; 19, itsmylo-hyoid is
branch; 20, inferior dental nerve in inferior dental canal scribed with the inferior
(opened); 21, masseter (turned down).
dental, which latter is a
sensory nerve, while the former is in reality motor in character. Its
fibres can be traced from its point of distribution backward to the ante-
rior or motor root of the fifth nerv^e. It is given oif from the inferior
dental nerve just as it is al)()ut passing into the posterior dental foramen,
and passes (lownwaixl and forward, accompanied by the mylo-hyoid
artery in the mylo-hyoid groove of the inferior maxillary bone. It is
distributed to the inferior surface of the mylo-hyoid and the anterior
belly of the digastric, also the tensor jjalati and tensor tyrapani mus-
cles. A few filaments from this branch pass through the mylo-hyoid
muscle and interlace with the lingual nerve. Branches are also de-
296 ANATOiMY.
fibres of the tongue, divide into finer filaments, which are distributed
to the mucous membrane of the anterior two-thirds of the tongue and
terminate in the conical and fungiform papillae.
A few jAcxifonn jilaiiicnts, which pass beneath the tongue, some ter-
minating on the under surface of the tip and in the glands of Niihn.
The Inferior Dental Nerve.
The Inferior Dental Nerve is the largest of the branches of the third
or inferior maxillary division of the fifth nerve (Fig, 145). From its
origin it passes downward,
V\a. 145.
accompanied by the inferior
dental artery, on the inter-
nal surface of the external
pterygoid muscle posterior
and a little to the side of
the lingual nerve. After
reaching the lower border
of the external pterygoid
muscle it passes between the
lateral ligament and the ra-
mus of the jaw, and enters
the inferior dental canal
through the posterior den-
tal foramen. It then j^asses
through this canal, and ter-
minates opposite the an-
terior or mental foramen
by dividing into incisor
and mental branches.
The branches of the in-
ferior dental nerve are
Pterygo-maxillary Region ami Fifth Nerve: 1, temporal fas-
cia; 2, temporal imi.scle ; '.i, temporal branches of auriculo- A Communicating
temporal nerve; 4, deep temporal branch of buccinator Branch, which passes over
nerve; o, deei> temporal nerves; (>, jiterygoideus externus;
7, deep temporal l)ranch of masseteric nerve (inconstant) the internal maxillary ar-
8, buccinator (or long buccal) nerve (fifth); 9, masseteric
nerve; 10, buccal briinch of seventh; 11, auriculo-temporal tery to the lingual nerve.
nerve; IJ, lingual nerve; i:*, facial nerve (seventh) at stylo-
mastoid foramen; 11, buccinator muscle; ll, pterygoideus A 3Ij/lo-hi/oid Branch,
internus; 16, supramaxillary branch of seventh; 17, infe- which generally de-
rior dental nerve; IS, its mental branches; 19, itsmylo-hyoid is
branch; 20, inferior dental nerve in inferior dental canal scribed with the inferior
(opened); 21, masseter (turned down).
dental, which latter is a
sensory nerve, while the former is in reality motor in character. Its
fibres can be traced from its point of distribution backward to the ante-
rior or motor root of the fifth nerv^e. It is given oif from the inferior
dental nerve just as it is al)()ut passing into the posterior dental foramen,
and passes (lownwaixl and forward, accompanied by the mylo-hyoid
artery in the mylo-hyoid groove of the inferior maxillary bone. It is
distributed to the inferior surface of the mylo-hyoid and the anterior
belly of the digastric, also the tensor jjalati and tensor tyrapani mus-
cles. A few filaments from this branch pass through the mylo-hyoid
muscle and interlace with the lingual nerve. Branches are also de-
