The regions where the jaw muscles were anchored are located further back on the skull to avoid interference with feeding. The kidney-shaped mandibular glenoid would have made the jaw joint steadier and stopped the mandible from dislocating.
To avoid complications with eating, the attachment points for the jaw muscles were positioned more towards the rear of the skull. A kidney-shaped mandibular glenoid would have provided greater stability to the jaw joint, thereby preventing the mandible from shifting out of place.