Quá trình [[cốt hóa]] xương hàm dưới diễn ra khi chất xương được bồi đắp trong màng sợi bao phủ bên ngoài [[sụn Meckel]].
TheseNhững cartilagessụn formnày thetạo [[cartilaginousthành bar]]phần ofsụn thecủa [[mandibularcung archxương hàm]],andphải arevà twotrái. inĐầu number,gần a right and a left.và Theirđầu proximal or cranial ends are connected with the ear capsules, and their distal extremities are joined to one another at the [[symphysis]] by [[mesodermal]] tissue. They run forward immediately below the condyles and then, bending downward, lie in a groove near the lower border of the bone; in front of the [[canine tooth]] they incline upward to the [[symphysis]]. From the proximal end of each cartilage the [[malleus]] and [[incus]], two of the bones of the middle ear, are developed; the next succeeding portion, as far as the lingula, is replaced by fibrous tissue, which persists to form the [[sphenomandibular ligament]].
Between the lingula and the canine tooth the cartilage disappears, while the portion of it below and behind the incisor teeth becomes ossified and incorporated with this part of the mandible.
