. Anatomie, descriptif et appliquée. L'anatomie. Spécial 106 Anatomie du squelette. Surjace antérieure. partie de l'os qui est à l'extérieur le foramen infraorbital canal et l'os malaire. (3) la bouche, à partir de laquelle est élaboré le processus palatin en arrière et le canal de Stenson partie adjacente de la paroi nasale. 4. Un premaxiUary, pour la partie avant de l'alvéole, qui transporte les incisives et correspond à l'os prémaxillaires des animaux inférieurs. (5) Une nasale, qui donne lieu à la processus nasal et le passage au-dessus de la dent canine. (6) Un infravomerine, qui se trouve sous la

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. Anatomy, descriptive and applied. Anatomy. 106 SPECIAL ANATOMY OF THE SKELETON. Anterior Surjace. portion of the bone which has external to the infraorbital canal and the malar process. (3) A palatal, from which is developed the palatal process posterior to Stenson's canal and the adjoining part of the nasal wall. 4. A premaxiUary, for the front part of the alveolus, which carries the incisor teeth and corresponds to the premaxillary bone of the lower animals. (5) A nasal, that gives rise to the nasal process and the portion above the canine tooth. (6) An infravomerine, that lies beneath the vomer and between the palatal and premaxillary centres. The premaxillary centre is in close association with the development of the perpendicular plate of the ethmoid and the vomer. According to Albrecht it develops from two centres of ossification, each having an incisive tooth. The one possessing the mesal segment he calls the endogiiatldon. The lateral segment he calls the mesognathion, while to the maxilla he gives the name exognathion. These seg- ments are separated by five sutures. The failure of union of any of these segments will lead to the various forms of cleft palate. These centres appear about the eighth week, and by the tenth week have become fused together so that the bone consists of two portions, one the maxilla proper, and the other the premaxillary portion. The suture between these two portions on the palate persists until middle life, but is not to be seen on the facial surface. This is believed by Callender to be due to the fact that the front wall of the sockets of the incisive teeth is not formed by the pre- maxillary bone, but by an outgrowth from the facial part of the maxilla. The antrum appears as a shallow groove on the inner surface of the bone at an earlier period than any of the other nasal sinuses, its development commencing about the fourth month of fetal life, and reaches its full size after the second dentition. The sockets for the teeth are

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