방사선상에 의한 한국인태아골반의 화골에 관한 연구

Abstract

The roentgenograms of 372 Korean fetuses ranging from the 4th to the 10th fetal month were examined to study the process of ossification of the pelvis and the following conclusions have been drawn. 1. The ossification of the ilium begins at the body near the accetabular fossa before the 4th fetal month, extends radially toward the iliac crest in becoming of a fan-shape and the streaks and the nodules appear in the middle of fetal stage in all the cases. 2. The ossification of the ischium begins at the body near the accetabular fossa in the 5th fetal month, extends toward the superior ramus in becoming of a vertical rod-shape and the streaks and the nodules appear in the late fetal stage in all the cases. 3. The ossification of the pubis begins at the body near the accetabular fossa in the 6th fetal month, extends toward the superior ramus in becoming of a horizontal rod-shape and the streaks and the nodules appear rarely in the late fetal stage. 4. The ossification of the 1st vertebral body of the sacrum begins in the 4th fetal month, of the 2nd and the 3rd begin in the 5th, of the 4th begins in the early 7th and of the 5th begins in the 7that the center of the body in becoming of a transversely oval shape and relatively few nodules appear in the late fetal stage , but no streaks are found. 5. The ossification of the 1st vertebral arch of the sacrum begins in the 5th fetal month, of the 2nd begins in the 6th , of the 3rd and the 4th begin in the 7th and of the 5th begins in the 8th at the both sides of the corresponding vertebral body in becoming of a round shape and the nodules appear rarely, but no streaks are found. 6. The ossification of the lateral portion of the 1st sacral vertebra begins in the 9th fetal month and of the 2nd begings in the 10th at the lateral sides of the corresponding anterior sacral foramina in becoming of a round shape , no streaks and nodules are found and the ossification center for the 3rd appears only in 50% of the cases. 7. The os~ification center for the coccyx appears less than 50% of the cases in the 10th fetal month. 8. No differences are found in the process of the ossification between both sexes and right and left sides. 9. The findings of the study coincide generally with the results of Japanese fetuses reported by Fukayama and Asau respectively and of the white and negro fetuses reported by Francis.