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The angle of the mandible (gonial angle) is located at the
posterior border at the junction of the lower border of the
ramus of the mandible.
The angle of the mandible, which may be either inverted or everted, is marked by rough, oblique ridges on each side, for the attachment of the
masseter laterally, and the
pterygoideus internus (
medial pterygoid muscle) medially; the
stylomandibular ligament
The stylomandibular ligament is the thickened posterior portion of the investing cervical fascia around the neck. It extends from near the apex of the styloid process of the temporal bone to the angle and posterior border of the angle of the man ...
is attached to the angle between these muscles.
The forensic term for the midpoint of the mandibular angle is the gonion. The gonion is a
cephalometric landmark located at the lowest, posterior, and lateral point on the angle.
This site is at the apex of the maximum curvature of the mandible, where the ascending ramus becomes the body of the mandible.
The mandibular angle has been named as a forensic tool for gender determination, but some studies have called into question whether there is any significant
sex difference in humans in the angle.
See also
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Ohngren's line
Additional images
Image:Mandibular angle - animation.gif, Position of angle of the mandible (shown in red). Animation.
File:Mandibular angle - close-up - animation.gif, Mandible bone. Position of angle shown in red.
File:Gray176 mandibular angle.png, Mandible. Outer surface. Side view. (Angle labeled at bottom right.)
File:Gray177 mandibular angle.png, Mandible. Inner surface. Side view. (Angle visible at bottom left.)
Image:Gray383.png, The Pterygoidei; the zygomatic arch and a portion of the ramus of the mandible have been removed.
File:Slide5oooo.JPG, Mandible. Inner surface. Angle of mandible labeled at bottom right.
References
External links
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* - "Oral Cavity: Bones"
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Bones of the head and neck
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