Angle of the mandible
The bony corner where the jaw's vertical and horizontal sections meet.
This anatomical landmark marks the junction between the lower border of the mandibular ramus and its body. It serves as a key reference point in forensic science and cephalometric analysis for mapping skull structure.
- Also known as the gonial angle or Masseteric Tuberosity.
- The gonion is the forensic term for the midpoint of this angle.
- Rough ridges here attach the masseter and medial pterygoid muscles.
- Some mammals have an angular process just above this location.
What it is
The angle of the mandible sits at the back edge of the jawbone. It is the precise spot where the vertical part called the ramus meets the horizontal body of the mandible. This area often shows rough, diagonal ridges. These textures provide attachment points for muscles. The masseter muscle connects on the outer side. The medial pterygoid muscle attaches on the inner side. A ligament known as the stylomandibular ligament anchors between these two muscles. The shape can appear either inverted or everted depending on the individual.
History and origin
Forensic experts have long used this bone feature to help determine gender. They looked for differences in the angle between males and females. However, recent studies question if these differences are significant enough to be reliable. The term gonion refers specifically to the midpoint of this angle. It is a standard landmark in cephalometric analysis. This analysis maps the skull's proportions for medical and scientific study.
What it means
This feature has no cultural or fashion meaning. It is purely an anatomical structure. Its importance lies in science and medicine. Researchers use it to understand human skeletal variation. Some mammals possess a similar bony prong above this angle. This structure is called the angular process. It distinguishes certain animal species from humans.
The science
The gonion is the lowest, posterior, and lateral point on the angle. It marks the apex of the maximum curvature of the mandible. Here, the ascending ramus transitions into the body of the jaw. The site is crucial for measuring facial proportions. Studies examine sex differences in humans regarding this angle. Results suggest variations may not be as distinct as once thought.
Questions people ask about Angle of the mandible
What is another name for the angle of the mandible?
It is also called the gonial angle, Masseteric Tuberosity, or Masseteric Insertion. In forensic contexts, the midpoint is referred to as the gonion.
Where exactly is this angle located?
It is found at the posterior border where the lower edge of the mandibular ramus joins the body of the mandible.
Is this angle useful for determining gender?
It has been used as a forensic tool for gender determination. However, some studies question whether there are significant sex differences in humans at this site.
What muscles attach to this area?
The masseter muscle attaches laterally. The medial pterygoid muscle attaches medially. The stylomandibular ligament connects between them.
Good reading and sources
- Angle of the mandible on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Angle of the mandible", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFaceShape rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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