The vast majority of theses in this collection are open access and freely available. There are a small number of theses that have access restricted to the WWU campus. For off-campus access to a thesis labeled "Campus Only Access," please log in here with your WWU universal ID, or talk to your librarian about requesting the restricted thesis through interlibrary loan.
Date Permissions Signed
Date of Award
Master of Arts (MA)
Stevenson, Joan C.
Campbell, Sarah K.
Anderson, Roger A. (Roger Allen)
Pterion is a skull landmark located directly behind the orbits where four cranial bones (sphenoid, parietal, temporal and frontal) articulate in 4 basic configurations: spheno-parietal, fronto-temporal, stellate and epipteric. Two hypotheses may explain the configurations and other aspects of pterion: 1) phylogenetic history reflected in conservative development in species with shared ancestry and 2) biomechanical forces due to chewing stressors on skull shape. Impacts of phylogenetics and biomechanics may be highlighted through the diversity of skull used.
Skulls from UW’s Burke Museum were assessed for pterion pattern, suture length and masseter and temporalis muscles in: Canis latrans (30), Vulpes vulpes (30), Ursus americanus, (30), Puma concolor (18), Lynx rufus (30), Papio hamadryas (8), Saimiri sciureus (8), Odocoileus hemionus (14), Cervus elaphus (4), Lepus americanus (21). Chi-square tests were used to test for an association of pterion pattern x Order, Family and Genus (Phylogenetics). Chi-squares are used to test for an association between pterion pattern and suture complexity (Biomechanics). Linear regressions are used to identify biomechanical predictors on cranial suture length.
The results of the analysis provide evidence to support pterion is conservative at each phylogenetic level and that biomechanical variables do predict some of the variation in cranial suture length. This analysis is one of a handful to move beyond the traditional comparative approach and highlights the importance of phylogenetic relatedness and biomechanics influences on pterion.
Skull--Mechanical properties, Skull--Phylogeny, Craniology, Human anatomy--Variation
Western Washington University
Copying of this thesis in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Creative Commons License
This work is licensed under a Creative Commons Attribution-No Derivative Works 4.0 License.
Gamet, Nambi, "Investigating Pterion from Two Perspectives: Phylogenetics and Biomechanics" (2017). WWU Graduate School Collection. 580.