Most mandibular growth, excluding the condylar region, occurs through intramembranous ossification, where bone forms directly from mesenchymal tissue without a cartilage intermediate. This process primarily contributes to the bone's lateral and vertical expansion. In contrast, the mandibular condyles grow by endochondral ossification. Understanding this distinction is crucial for surgical planning, especially in procedures involving mandibular reconstruction or growth modification, as the bone quality and healing potential differ based on the ossification type. Recognizing that the majority of the mandible develops intramembranously aids in predicting bone behavior during osteotomies and graft integration.

Reference: Gray's Anatomy, Standring S, 42nd Edition.