Vilmann H, Moss M L
Gegenbaurs Morphol Jahrb. 1979;125(4):572-82.
The present paper considers the significance of a variety of cranial flexions in the process of orthocephalization of the rat skull between 14 and 60 days postnatally. The study is based on a sample of 27 male rats, who have been x-rayed at 14, 30 and 60 days with subsequent analyses of the photographs obtained. In this period the angle between the cranial base and the facial part of the skull becomes more obtuse, i.e. the skull becomes more orthocranial. The cranial base becomes at the same time more airobasal (lordotic). Angular changes between the individual bones in the cranial vault straightens the vault markedly. By this it becomes orthodorsal. As the angle between the basisphenoid and the parietal bones stays more or less constant between 14 and 60 days, the impression is created that both the anterior and posterior parts of the neural skull rotate upwards relative to this bone complex. Thus, orthocephalization in the period between 14 and 60 days both consists of flexions between the facial and neural parts of the skull (prebasal flexions), and may be more importantly of interosseous ventral and dorsal flexions.
本文探讨了出生后14至60天大鼠颅骨正颅化过程中各种颅骨弯曲的意义。该研究基于27只雄性大鼠的样本，这些大鼠在14天、30天和60天时进行了X光检查，并对获得的照片进行了后续分析。在此期间，颅底与颅骨面部部分之间的角度变得更加钝角，即颅骨变得更加正颅。与此同时，颅底变得更加气颅化（脊柱前凸）。颅顶各骨之间的角度变化使颅顶明显变直。由此它变得正背位。由于蝶骨基底部与顶骨之间的角度在14至60天之间或多或少保持恒定，给人的印象是神经颅骨的前部和后部相对于这个骨复合体向上旋转。因此，14至60天期间的正颅化既包括颅骨面部和神经部分之间的弯曲（基底前弯曲），更重要的可能是骨间腹侧和背侧弯曲。
