Time And Order Of Appearance Of Ossification Centres Of The Rat Skeleton

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Time And Order Of Appearance Of Ossification Centres Of The Rat Skeleton

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Title: Time And Order Of Appearance Of Ossification Centres Of The Rat Skeleton
Author: Mohamed, M. B. H. [محمد بهجت حسين محمد]
Abstract: The time and sequence of ossification pattern of the skeletal system of the Rattus rattus were studied in serial whole mounts prepared from Day 10 to Day 21.5 (day of delivery). In the neurocranium, each bone is represent by a single ossification centra. At birth, the neurocranium is a well formed miniature of that in the adult. Four stages can be distinguished in the ossification of the vertebral column. All ossification centres in the vertebrae were found to be present at birth. In the appendicular skeleton, the chondrogenesis and osteogenesis patterns proceed in proximo-distal sequence with postero-anterior direction. It is possible to map limb part giving rise to each skeletal element as it appears. The pelvic limb bones are ossified later than those of the pectoral limb. Sexual dimorphism during ossification is not pronouced.ان دراسة التكوين الشكلي لقطع الجمجمة العصبية ، العمود الفقري ، الطرفين الأمامي والخلفي ، الحزامين الصدري والحوضي لأجنة الفئمار الأبيضى - عمر 9 أيام حتى موعد الولادة - أوفهحت تبماين ظهور القطع الغضروفية وأزمنة تعظمها . الجمجمة العممبية أظهربئ تعظما مفردا لقطعها ، اشقرات أظهرت أزمنة مختلت للتعظم داخل الفقرة الواحدة وبلين الفمرات المخ! ، اسرفان رالحض امان تعظمها يتبم تكوين قطعهما الغضروفية . وقيلت أطوال لخع الأطراف ومعدلات الزيادة لأطوالها . وقد قورنت النتمائج بالنماذج الظ حة في القوارفى المختلت .
URI: http://hdl.handle.net/10576/10069
Date: 1985

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