A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal
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A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal - Aleš Hrdlička
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Title: A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal
Bulletin of the AMNH, Vol. XIII, Article XXI, pp. 281-295, Dec. 31, 1900
Author: Ales Hrdlicka
Release Date: October 19, 2010 [EBook #34101]
Language: English
*** START OF THIS PROJECT GUTENBERG EBOOK PARIETAL BONE IN A CHIMPANZEE ***
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A Bilateral Division of the Parietal Bone
in a Chimpanzee; with a Special Reference
to the Oblique Sutures in the
Parietal.
By
Aleš Hrdlička
AUTHOR'S EDITION, extracted from BULLETIN
OF THE
American Museum of Natural History,
Vol. XIII, Article XXI, pp. 281–295.
New York, Dec. 31, 1900.
The Knickerbocker Press, New York
Article XXI.—A BILATERAL DIVISION OF THE
PARIETAL BONE IN A CHIMPANZEE; WITH
SPECIAL REFERENCE TO THE OBLIQUE SUTURES
IN THE PARIETAL.
By Aleš Hrdlička.
The first to describe a case of division of the parietal bone in apes was Johannes Ranke, in 1899. [1] The skull in question is that of an adolescent female orang, one of 245 orang crania in the Selenka collection in the Munich Anthropological Institute. The abnormal suture divides the right parietal into an upper larger and a lower smaller portion. The suture runs nearly parallel with the sagittal suture,
but, as the illustration shows (Fig. 1), it descends in its posterior extremity towards the temporo-parietal suture, and terminates in this a few millimetres in front of the lambdoid suture. The abnormal suture shows but little serration, and the articulation of the two divisions of the parietal bone is squamous in character, the lower portion overlapping the upper. Below the junction of the abnormal with the coronal suture, the latter takes a pronounced bend forward. A similar bend in the coronal suture is present in the same specimen on the left side. This is common among the other orang skulls in the collection. The portions of the coronal suture below and above the bend differ somewhat in character.
Besides the above-mentioned complete division, Ranke found among the 245 orang skulls 13 with incomplete division of the parietal bone. The division consisted invariably of a longer or shorter remnant of a horizontal parietal suture,
ending in the coronal