The results were as follows . the tissue of plants in narcissus l . having air antrum and dental antrum or not , their distribution , the arrangement mode and number of vascular bundles among different materials were different 结果表明，叶片中气腔、花梗中髓腔的存在与否以及分布情况、维管束的排列方式及其数目在不同材料间存在较大差异。
Meanwhile , in the marrow cavity , osteoclasts are eroding the bone that was deposited early in life , and other cells are making secondary bone tissue along the perimeter of the cavity or invading the cortex ( outer layer ) of the remaining bone to remodel it 与此同时，在髓腔中，蚀骨细胞持续侵蚀较早沉积的骨质；并有其他细胞沿著髓腔周围产生次生骨组织，或是侵入既存骨骼的皮质（外层）来为其重新塑形。
The results indicate that arctic fox wool , the angolan rabbit hair , the hair of nyctereutes ussurienusis mstscie with medulla cavity ' s density and breaking strength are small , but the angolan rabbit hair ' s superficial curl number is less ; the density of shanxi shep camel ' s hair is equal to wool and cashmere , the breaking strength and breaking elongation ratio are bigger than others 结果表明，有髓腔的北极狐毛、安哥拉兔毛、貉毛的密度和断裂强度均较小，但安哥拉兔毛的表面卷曲数少；山西羊驼毛的密度与羊毛、羊绒相当，强力和断裂伸长率较大，产品耐磨性较好。
Methods ： fifty paired embalmed cadaveric humeri ( twenty - five pairs : fourteen from male donors and eleven from female donors ) were scanned in medial - lateral ( ml ) and anterior - posterior ( ap ) position according to the humeral retroversion by ct . images of the humeri in the transverse planes at the lowest border of neck ( lbn ) , 20mm and 40mm distal of lbn ( lbn - 20 、 lbn - 40 ) , isthmus , head - neck anterior - posterior ( hn - ap ) were obtained . sixty - one extracortical and intracortical parameters were measured exactly by image analytic computer software that included offset , head position , head - shaft angle , head to tuberosity height ( ht ) , head thickness , curvature radius , articular surface arc ( sa ) , neck diameter , isthmus position , proximal and distal border of isthmus , maximum coronal and sagittal diameter of medullary canal and thickness of cortical bone in four planes , including lbn , lbn - 20 , lbn - 40 and isthmus 方法： 50根成对防腐肱骨(男14对，女11对)按肱骨头扭转角置于冠状位和矢状位，行肱骨全长，头颈矢状面，解剖颈下缘及其下20mm 、 40mm ，髓腔狭窄部四平面ct扫描，由ct软件测量冠、矢状位髓腔内外参数共61项，包括头心?干轴距，头位置，头干角，头?结节高度差，头厚度，头半径，关节面张角，解剖颈直径，髓腔狭窄部位置，解剖颈下缘及其下20mm 、 40mm和狭窄部四个平面髓腔的最大冠、矢状径，皮质骨厚度等。
