A rostral denticle of Ischyrhiza mia, a species belonging to an extinct group of sawfishes that lived in North American waters during the late Cretaceous period, around 100 to 65 million years ago.

Throughout the postnatal life of rodents, neural progenitor cells migrate from the subventricular zone (SVZ) of the forebrain through the rostral migratory system (RMS) to the olfactory bulb.