On pteric sutures and pteric bones in the human skull - DWC - KNAW

635
Au examination of tlle Sklllls of papuans, brollght home by tlle
LORl!.N'l'Z' expedition from Dlltch 8011tl1 New-Gllinea, augmented with
a number of papuan skll11s, sent fo me by the military-surgeon
DE KOOK from the same dist!'iet, sl10wed snch l'elations in the pteric
reg ion , that made a closer examination necessary.
A study of the concel'ning literatlll'e teaches, that the different
investigations on the pl'oe. fl'ontalis as weil as on the pteric bones
al'e ne~rIy all of a statistieal nature, and do ]10t reek on with the
condition of the two opposite siges of the same sknll. As a consequenee
of this way of investigation, the different forms of p)'ocesslls
fi'ontalis are alv.'ays explained in the same way. Only GRUBER 1)
mentions two forms of a fronto-temporaI SlltUl'C.
'l'he examination of 114 papllan slmlI'3 drew my attention to three
qllestions, viz. 1 that se, eral forms of proc. fl'ontalis must be discEll'lled.
2 that 1'01' the judging of the character of a pl'oeessus fl'ontalis
the two opposite sides of the same skull must ue mutually
eOf1lpal'ed and 3 that the pl'oeessus fi'ontalis and the ptel'ic bOlles
must be eompal'ed with each othe1'.
Regarding the first point I obs0rve that tvvo forms of proc. frontalis
ossis temporalis must be distingllished. I eaU these two forms of
proc~ frontalis type I and type Il.
Type I shows a projecting part at the upper border of fhe squama
temporalis, as is seen in figul'e :I. By pl'olongil1g the Sllture between
temporale and the alisphenoid in upward dil'eetion, as is done in
Fig. 1. Fig. 2.
1) GRUBER W.Über die Vel'bindung der SchJäfellbeillschuppe mit dem Stirnbeine. 1874.
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