As the junction between the head and the trunk, the neck functions in providing
head stability during behaviors like feeding to facilitating head mobility during behavior
like grooming and predator vigilance. Despite its importance to these vital behaviors, its
form and function remain poorly understood. Fossil hominin cervical vertebrae preserve
a striking diversity in form despite the commitment to orthograde bipedality. Do these
differences in cervical vertebral form correspond to functional variations among our
recent ancestors? This dissertation attempts to understand 1) how does the neck function
in head stability and mobility 2) how do these functions relate to cervical vertebral form.
Kinematic and passive range of motion studies were conducted in several species of
primate to obtain measures of function which were subsequently related to skeletal form.