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TEMPORALIS. 19
TEMPORALIS.
It is situated on the side of the Head, above, and somewhat
before the Ear. It is a pretty broad, flat, and radiated Muscle ;
broad and thin at its origin ; narrow and thick at its insertion ;
and is covered with a pretty strong Fascia, above the Jugum.
This Fascia is fixed to the bones round the whole circum-
ference of the origin of the Muscle. Above, it is fixed to a
smooth white line, that is observable upon the Skull, extending
from a little ridge on the lateral part of the Os Frontis, con-
tinued across the Parietal Bone, and making a turn towards the
Mammillary Process. It is fixed below, to tho ridge where the
Zygomatic Process begins, just above the Meatus Auditorius
then to the upper edge of the Zygomatic Process itself, and
anteriorly to the Os Malse. This adhesion, anteriorly, above,
and posteriorly, gives, as it were, the circumference of the origin
of the Temporal Muscle.
almost entirely by the malar bone, above by the temporal, so that the
suture between them extends obliquely nearly the whole length of the
It is arched upwards as well as outwards, the upper margin being
arch.
convex, the lower concave, and the latter is deeply excavated for the
attachment of the muscle. It is to be observed that the more purely
carnivorous the animal, the greater is the convexity of the vertical arch
described by the zygoma. The short and very thick masseter arising
from the vaulted arch above passes downwards, backwards, and inwards,
to be inserted into the posterior part of the lower border of the jaw, and
into the lower portion and inferior boundary of the deep fossa which
occupies its external surface behind the great molar tooth (carnasstere),
whilst the most external of the fibres turn round the inferior margin of
the bone, to be fixed in a tendinous rapM common to it and the external
pterygoid. (1) The postero-internal portion of the muscle which rises in
front of the glenoid cavity has a direction downwards and forwards,
ami is inserted into the external excavated surface of the coronoid. In the
Carnivora, the masseter is at its maximum of development and power as
an elevator of the lower jaw. With them we may compare another order
—Rodentia—in which this muscle has another purpose to fulfil besides
that o'f raising the jaw—viz., the production of that motion from behind
forwards for which we have already seen the articular surfaces of the
(1) Vide Straus-Durckheim, Anatomie du Chat, T. ii., p. 217.
TEMPORALIS. 19
TEMPORALIS.
It is situated on the side of the Head, above, and somewhat
before the Ear. It is a pretty broad, flat, and radiated Muscle ;
broad and thin at its origin ; narrow and thick at its insertion ;
and is covered with a pretty strong Fascia, above the Jugum.
This Fascia is fixed to the bones round the whole circum-
ference of the origin of the Muscle. Above, it is fixed to a
smooth white line, that is observable upon the Skull, extending
from a little ridge on the lateral part of the Os Frontis, con-
tinued across the Parietal Bone, and making a turn towards the
Mammillary Process. It is fixed below, to tho ridge where the
Zygomatic Process begins, just above the Meatus Auditorius
then to the upper edge of the Zygomatic Process itself, and
anteriorly to the Os Malse. This adhesion, anteriorly, above,
and posteriorly, gives, as it were, the circumference of the origin
of the Temporal Muscle.
almost entirely by the malar bone, above by the temporal, so that the
suture between them extends obliquely nearly the whole length of the
It is arched upwards as well as outwards, the upper margin being
arch.
convex, the lower concave, and the latter is deeply excavated for the
attachment of the muscle. It is to be observed that the more purely
carnivorous the animal, the greater is the convexity of the vertical arch
described by the zygoma. The short and very thick masseter arising
from the vaulted arch above passes downwards, backwards, and inwards,
to be inserted into the posterior part of the lower border of the jaw, and
into the lower portion and inferior boundary of the deep fossa which
occupies its external surface behind the great molar tooth (carnasstere),
whilst the most external of the fibres turn round the inferior margin of
the bone, to be fixed in a tendinous rapM common to it and the external
pterygoid. (1) The postero-internal portion of the muscle which rises in
front of the glenoid cavity has a direction downwards and forwards,
ami is inserted into the external excavated surface of the coronoid. In the
Carnivora, the masseter is at its maximum of development and power as
an elevator of the lower jaw. With them we may compare another order
—Rodentia—in which this muscle has another purpose to fulfil besides
that o'f raising the jaw—viz., the production of that motion from behind
forwards for which we have already seen the articular surfaces of the
(1) Vide Straus-Durckheim, Anatomie du Chat, T. ii., p. 217.
