American Journal of Roentgenology, Vol 127, Issue 3, 469-471
Copyright © 1976 by American Roentgen Ray Society
The os incae
R Shapiro
and
F Robinson
The The os incae is an integral feature of reptilian and various mammalian skulls which demonstrate intramembranous ossification centers behind the parietal bones. In man, the interparietal portion of the occipital squamosa arises in membrane from a single ossific focus. Normally it fuses with the supraoccipital segment of the occipital squamosa. Occasionally there are multiple ossification centers in the interparietal bone which fail to fuse, resulting in one of several varieties of os incae.