Figure 3: Interior nasal anatomy and vomeronasal complex in primates.
From: Cerebral complexity preceded enlarged brain size and reduced olfactory bulbs in Old World monkeys
Atrioturbinal ridges extend outwards on the premaxilla in (a) Ateles and (b) Aegpyptopithecus (arrows) but are absent in (c) Macaca and (d) Victoriapithecus, whose nasal ridges descend inferiorly and terminate within the nasal cavity. The vomeronasal groove (VNG) is a U- or J-shaped depression (arrows) along the bony maxillary in palate47 in (e) Potto, (f) Alouatta and (g) the stem catarrhine Aegyptopithecus but is absent in (h) Victoriapithecus.
