It was named for a notch on its coronoid process which most likely was the insertion point for a chewing muscle, the adductor mandibulae externus.
The globus pallidus externus normally sends inhibitory signals to the subthalamic nucleus.
In these taxa, the trochanteric fossa is the insertion point for the puboischiofemoralis externus muscle.
Muscles like the adductor mandibulae externus medialis, which are weak in most crocodilians, became more important as jaw closers and were greatly enlarged.
Moving from the inferior-most to the superior-most, they are: the tendon of the obturator externus muscle, the obturator internus, the superior gemellus and inferior gemellus.
Some regard them as a part of the sphincter ani externus.
The supernumerary muscle described above originates from the superior fasciculus, while an anomalous fasciculus also derived from the obturator externus originates from the main belly.
Intercostalis externus labeled at bottom center.
