Related Experiment Video
Updated: Oct 13, 2026

Quantification of Orofacial Phenotypes in Xenopus
Published on: November 6, 2014
[Descriptive equations of the frontal-facial profile of Australopithecus africanus STS5 (Plesianthropus
Abstract:
By means of the method previously carried-out by performing computerized image analysis we obtained three polinomial equations (7 degree) of best curve fitting for total (fronto-facial), frontal and facial profiles respectively of a standard lateral view of the skull Plesianthropus transvaalensis. The smooth function curves approximating the historical data are perfectly coincident with the scatter diagram for frontal (variance = 0,41) and facial (variance = 0,22) equations, while for the total contour variance raises to 90,8. The finding of the best fit equation is performed by analysis of variance simultaneously to the computation of the coefficients of progressively increasing order equations starting from the second. Then coefficient of determination, standard error of estimate. Standard deviations of coefficients and variance/covariance matrix are calculated with some dimensional parameters as length, eight and projections of profile, relate indexes and arc-chord ratio.
More Related Videos
08:15Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face
Published on: January 7, 2019
08:03Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
Published on: November 4, 2025
Related Concept Videos
Overview of the Skull
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
Cranial Bones: Superior and Posterior View
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
Cranial Bones: Lateral View
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
Sutures of the Skull
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
Muscles for Facial Expressions