This may indeed represent one of the events that triggered the great development of the dorsal pallium and associated structures in the mammalian radiation.
The dorsal and ventral visual systems are defined anatomically.
All these conditions, it is suggested, are conducive to inducing dorsal system function in preparing the response to the gap size.
Panels are coronal sections, with the dorsal aspect facing upwards.
All figures are of coronal sections; dorsal to top, lateral to left.
Each figure is of a coronal section, lateral to left and dorsal to top.
The ventral epicondyle is enlarged, extending distally to below the level of the dorsal and ventral condyles.
Petiole with dorsal lateral carinae strongly elevated over basal half, much weaker posteriorly, but extending to posterior margin.
