Chin size relative to temporal fossa size for a mixed-sex sample of adult modern humans from the Tigara () and El Hesa () collections housed at the American Museum of Natural History. Chin size is determined as a simple product of midsagittal height and chin thickness at the tuber symphyseos, and temporal fossa size is likewise the product of fossa length and breadth. If temporal fossa size is proportional to temporalis cross-sectional area, this variable serves as a proxy for adductor force, meaning that positive correlation of chin size and fossa size is expected if masticatory mechanics are functionally linked to corpus morphology. Regression is nonsignificant (), suggesting a lack of functional relationship.
