位于最上项线以上的枕鳞膜部,由两对中心发育而来,偶见的第三对中心,即前顶间骨中心,可在顶间骨中心前方发育。以前认为,前顶间骨在人字缝处,顶间骨前方,也即缝骨形成的部位。为区别真正的前顶间骨和缝骨乃进行此研究。在观察大批异常颅骨后,将人字缝处的缝骨与前顶间骨中心发育的骨区别开。通过形态和位置,识别一独 Pillow-shaped diaphragm located above the uppermost line, developed from two pairs of centers, and occasionally the third center, the anterior apex, can develop in front of the medial midochal. In the past that the anterior top of the bone in the herringbone Department, the anterior top of the interosseous bone, that is, the site of the formation of seam bone. This study was conducted to distinguish true anterior maxilla and suture bone. After observing a large number of abnormal skull, the seam between the girth of the ghoul and the bone in the center of the anterior top atrium is distinguished. Through the form and location, identify a unique