. The American journal of anatomy. 5. Nejgro 2m. 6. Megro 5m. 8. V/hite i m. A, Fig. 4 Normae frontales of frontal bones of juvenile skulls with a long armof the bregmatic fontanelle, which has been constricted in the lower cases to forma metopic fontanelle. FONTANELLA METOPICA IN AN ADULT SKULL 269 mm. of the nasion. In three other cases the great fontanellereached within 22 mm. of the nasion. This prolonged arm ofthe great fontanelle is an extreme variation, and is not necessarilya result of hydrocephalus. In the skull of a year old hydrocephalicnegro, the author found the great fontanelle r
. The American journal of anatomy. 5. Nejgro 2m. 6. Megro 5m. 8. V/hite i m. A, Fig. 4 Normae frontales of frontal bones of juvenile skulls with a long armof the bregmatic fontanelle, which has been constricted in the lower cases to forma metopic fontanelle. FONTANELLA METOPICA IN AN ADULT SKULL 269 mm. of the nasion. In three other cases the great fontanellereached within 22 mm. of the nasion. This prolonged arm ofthe great fontanelle is an extreme variation, and is not necessarilya result of hydrocephalus. In the skull of a year old hydrocephalicnegro, the author found the great fontanelle reaching to within 16mm. of the nasion; in contrast to the cases in figure 4, however, itwas, even at its lower end, 17 mm. wide; in the middle of thefrontal arc 29 nun. and at its upper end 35 mm. It is strikingthat the lowest portions of the frontal bones always approximate. Fig. 5 Norma verticalis of a skull of erethizon dorsatus with fontanellebones. each other and indeed to a height which is considered typicalfor the position of the metopic fontanelle, that is, to a point towhich the frontal arm of the great fontanella may extend un-interrupted or constricted. As a designation for the lowestportion of such long bregmatic fontanelles extending into thenasal third of the frontal arc, the name fontanella metopica maywell be retained. However, no fundamental difference is to bemade between the two mentioned fontanelles. It is more fre-quent for the lower end alone to remain patent in children and THE AMERICAN JODRNAL OP ANATOMY, VOL 23, XO. 2 270 ADOLF H. SCHULTZ to be recognizable in adults. The constriction of different por-tions of the frontal arm of the great fontanelle results from locallydecreased or increased growth of the lines of ossification, andmay occur in any situation, but appears to be most commonbetween the two tubera frontalia. Double cons
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