Orientation of the Deep Part of the Human Temporal Muscle and Morphological Study of the Infratemporal Crest.

Abstract

The morphology of the muscle bundle in the deep layer of the anterior temporal muscle was observed using cadavers for anatomical practice. With regard to the infratemporal crest, which is the origin of the muscle bundle, its cranial bone surface morphology was also observed, and the following results were obtained:1. This muscle bundle was thought to be part of the anterior muscle bundle of the temporal muscle, considering the innervation and fascial conditions.2. In elderly specimens, processes were noted on the bone surface of the infratemporal crest, which is the origin of this muscle bundle.3. The length of this muscle bundle was 36.85±2.78mm, and the width was 12.49±1.37mm, with an inclination angle of 80.83±2.46° to the auriculo-orbital plane (FH. plane).These findings suggested that although the deep muscle bundle is part of the anterior muscle bundle in the superficial layer, the muscle bundle developed as an independent muscle fascicle, causing changes in the bone surface in the adhesion area of the muscle, due to strong force applied during mandibular movement.