Functional morphology of the primate head and neck

American Journal of Physical Anthropology
Thierra K Nalley, Neysa Grider-Potter

Abstract

The vertebral column plays a key role in maintaining posture, locomotion, and transmitting loads between body components. Cervical vertebrae act as a bridge between the torso and head and play a crucial role in the maintenance of head position and the visual field. Despite its importance in positional behaviors, the functional morphology of the cervical region remains poorly understood, particularly in comparison to the thoracic and lumbar sections of the spinal column. This study tests whether morphological variation in the primate cervical vertebrae correlates with differences in postural behavior. Phylogenetic generalized least-squares analyses were performed on a taxonomically broad sample of 26 extant primate taxa to test the link between vertebral morphology and posture. Kinematic data on primate head and neck postures were used instead of behavioral categories in an effort to provide a more direct analysis of our functional hypothesis. Results provide evidence for a function-form link between cervical vertebral shape and postural behaviors. Specifically, taxa with more pronograde heads and necks and less kyphotic orbits exhibit cervical vertebrae with longer spinous processes, indicating increased mechanical advantage fo...Continue Reading

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Citations

Jan 24, 2018·Evolution; International Journal of Organic Evolution·Catalina I Villamil
Feb 16, 2018·American Journal of Physical Anthropology·Mikel ArlegiAsier Gómez-Olivencia
Mar 2, 2018·American Journal of Physical Anthropology·Marc R MeyerMarkus Bastir
Nov 9, 2018·American Journal of Physical Anthropology·Liza J Shapiro, Addison D Kemp
Mar 19, 2020·American Journal of Physical Anthropology·Neysa Grider-PotterYoshihiko Nakano
Oct 30, 2020·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Courtney A MillerHouri K Vorperian
May 21, 2017·Journal of Human Evolution·Thierra K Nalley, Neysa Grider-Potter
May 22, 2021·Journal of Human Evolution·Hyunwoo JungNoreen von Cramon-Taubadel

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