A keyhole-shaped frontoparietal fontanelle is present; the fontanelle is narrow anteriorly and wide posteriorly.
fontanelle, fon-ta-nel′, n. a gap between the bones of the skull of a young animal: an opening for the discharge of pus.
Firschein used the presence of the fontanelle to distinguish guttilatus from his petrophilus.
Furthermore, the fontanelle in question may alter its characteristic appearance in certain forms of sickness.
The basicranial axis is straight, and the fontanelle in the lachrymal region is very large.
It is externally surrounded by bone or cartilage, but sometimes it lies near a fontanelle or opening in the skull above.
The head was large, fontanelle open—superficial veins more apparent than natural.
also fontanel, 1540s, "hollow between two muscles," from French fontanelle (16c.), from Old French fontenele "small source, fountain, spring; fontanelle," diminutive of fontaine "spring" (see fountain), on analogy of the dent in the earth where a spring arises. In reference to the "hollow" in a baby's skull, it is first recorded 1741.
fontanel fon·ta·nel or fon·ta·nelle (fŏn'tə-něl')
Any of the soft membranous gaps between the incompletely formed cranial bones of a fetus or an infant. Also called soft spot.