BONE HISTOLOGY AND GROWTH PATTERNS OF SOME NONMAMMALIAN THERAPSIDS
BONE HISTOLOGY AND GROWTH PATTERNS OF SOME NONMAMMALIAN THERAPSIDS
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一些非哺乳动物兽孔类动物的骨组织学和生长模式
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
A. Chinsamy
中科院分区：
文献类型：
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作者：
S. Ray;J. Botha;A. Chinsamy
摘要研究了晚二叠世至早侏罗世的柳珊瑚、天牛头目和狗牙科的骨组织学特征。分析表明，在大多数骨骼元素中，皮质纤维板层骨组织占主导地位。纤维板层骨组织的高发生率表明总体上成骨速度很快，但确实会出现环状和/或滞后形式的中断。观察个体内部的元素间组织变化，如初级组织类型、皮质孔洞、LAG和环状、二次重建的程度和骨内骨沉积。总体而言，附肢的生长速度要快于附足。所研究的每个属都有不同的生长模式。这些生长模式从晚二叠世柳珊瑚的周期性生长模式到侏罗纪早期狗牙科的快速、持续增长模式都有不同。并对同生属的生长模式进行了记录和讨论。提出了一种快速生长的可能趋势，以及治疗药物内发育可塑性的独立减少或最终丧失。
Abstract The bone histology of gorgonopsian, therocephalian and cynodont genera, ranging from the Late Permian to Early Jurassic, was examined. The analysis reveals a predominance of cortical fibrolamellar bone tissue in most skeletal elements. The high prevalence of fibrolamellar bone tissue suggests an overall rapid osteogenesis, but interruptions in the form of annuli and/or LAGs do occur. Inter-elemental histovariation within individuals, such as primary tissue type, cortical porosity, LAGs and annuli, extent of secondary reconstruction and endosteal bone deposition, is observed. In general, propodials were found to have grown faster than epipodials. Distinct growth patterns were identified for each of the genera studied. These growth patterns vary from a cyclical growth pattern in the Late Permian gorgonopsian, Scylacops to fast, sustained growth in the Early Jurassic cynodont, Tritylodon. Growth patterns of contemporaneous genera are also noted and discussed. A possible trend towards fast growth, and an independent decrease or eventual loss of developmental plasticity within the therapsids, is proposed.