ntral aponeurosis of _pars
profundus_ and dorsal to the insertion of ~_M. adductor mandibulae
posterior_~. The more anterior fibers insert fleshily on the mandibular
fossa. The tendon of origin is actually one with the ventral
aponeurosis of _pars profundus_, which is situated in a horizontal
plane. The insertion is primarily a fleshy attachment on the mandibular
fossa. Some of the fibers that arise on the dorsomedial and lateral
surfaces of the tendon of origin attach to another tendon, which
inserts in the midline of the mandibular fossa on a small tubercle near
the anterior end. Also, there is insertion by an aponeurosis anterior
to _M. adductor mandibular posterior_ as stated above. Fibers attach to
the dorsal and ventral side of the aponeurosis.

~_M. adductor mandibulae externus profundus._~--The origin is fleshy
from the medial surface of the temporal fossa, the posterior wall of
the orbit and the otic process of the quadrate. The origin is bounded
laterally by the origin of _pars superficialis_ and medially by the
origin of _M. pseudotemporalis superficialis_. Ventrally the muscle
lies against its own ventral aponeurosis, which originates on the
posterior wall of the orbit immediately above the articulation of the
otic process of the quadrate, and which also receives many fibers from
the surface of the quadrate. The insertion is primarily by means of two
aponeuroses. The most dorsal aponeurosis inserts on a tubercle at the
posterior tip of the dorsal edge of the mandible. The lateral tendon of
_M. pseudotemporalis superficialis_ converges with the aponeurosis. It
is superficial and there are no fibers on its dorsal surface. The
ventral aponeurosis inserts on a crista immediately below the insertion
of the dorsal aponeurosis. It receives fibers on its ventral surface
from the otic process of the quadrate, and on its dorsal surface gives
rise to fibers that insert on the dorsal aponeurosis (figs. 2, 3, 5, 9,
10, 11, 13-18).

The tendon of insertion of _pars medialis_ of _M. adductor mandibulae
externus_ does not become a superficial aponeurosis posteriorly in the
Zenaida Dove as it does in the Mourning and White-winged doves.

~_M. pseudotemporalis profundus._~--The origin is fleshy from the
medial and partially from the dorsal surface of the lower mandible. The
origin is almost completely anterior to and partly dorsal and ventral
to the medial (most anterior) insertion of _M. pseudotemporalis
superficialis_. T