Caley M Orr

Research

My research is in the fields of paleoanthropology and primate functional morphology and evolution. A particular interest is in how the forelimb has evolved to meet the functional demands of locomotion and manipulation in early hominins (humans and our close fossil relatives) and other primate lineages. My dissertation project is focused on the biomechanical adaptations of the wrist to the various locomotor hand postures used by primates, especially the knuckle-walking locomotion of the African apes. Understanding adaptations to knuckle-walking is essential for testing the hypothesis that bipedal hominins evolved from a knuckle-walking ancestor.

My research is highly interdisciplinary. To address my questions, I employ a variety of bioengineering and computer science approaches to study the comparative anatomy and biomechanics of the forelimb in primates and other animals.

CLICK TO VIEW CARPAL KINEMATICS VIDEO

Methods

Laser-scanning and morphometrics

Computed tomography

Three-dimensional kinematics

Computer visualization

Tendon excursion method for measuring muscle moment arms

Vertebrate dissection

Other projects

Morphological affinities of the wrist and ankle of Homo floresiensis (the "Hobbit") from the late Pleistocene of Indonesia

Mechanics of the triceps brachii and habitual forelimb position in primates

Electromyography of forelimb muscles during stone-tool production

Evaluating claims of venom delivery in fossil mammals