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  praementum
Labium is on the outer surface of submentum, mentum and praementum with 1 pair of long setae.
      
  prementum
part of the mediproboscis, prementum, and labellar cap anlagen.
      
Within the membranous connecting tube that connects the prementum with the head capsule, the existence of an extra inner membrane has been confirmed.
      
During protrusion of the labium by hemolymph pressure, the prementum is accelerated during the initial phase of the process, and the nerves, muscles, tracheae, and glandular ductules that are attached to it are passively drawn into the labium.
      
The mechanoreceptive function of setae at the distal end of the prementum has been confirmed on the basis of their ultrastructural characteristics.
      
clypeobuccalis, the medially divided prementum, and the slender, apically bifid laciniae without any mesally directed setae or spines are potential autapomorphies of Paraneoptera (incl.
      
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The present paper deals with two new species of the family Anthomyiidae from Liaoning Province, China, namely Pegoplata laotudingga sp. nov. and Pegomya mediarmata sp. nov.

记述采自辽宁省的花蝇科 2新种 ,即分布于辽宁省桓仁县老秃顶山的老秃顶须泉蝇Pegoplatalaotuding gasp .nov .。该种外形与丁斑须泉蝇Pegoplatalinotaenia (Ma ,1988)近似 ,但新种雄性前胫无前背鬃 ,翅前鬃短小 ,腹部各背板均具倒山字形黑斑 ;肛尾叶端部较狭 ,侧尾叶后面观较细长 ,其侧面观端半部较宽大 ,末端较圆 ;前阳基侧突端半部狭 ,后缘具 1根小毛等不同。分布于辽宁省本溪南甸的中叶泉蝇Pegomyamediarmatasp .nov .,该种与并棘泉蝇Pegomyaholosteae (Hering ,192 4 )近似 ,但新种具上倾口缘鬃 1行 ,前颏发亮 ,翅前鬃长于后背侧片鬃 ;下腋瓣短小 ;前胫无前背鬃 ,中胫无后腹鬃 ,后胫前背鬃 2 ;第 5腹板具中叶 ,侧叶基部和端部分别具一鬃毛簇 ,阳茎具宽大的端阳体等不同。模式标本保存于沈阳师范大学昆虫研究所

Objective To study the morphological characteristics of craniofacial contour in ageing.Methods Craniofacial morphology was examined in a sample of 20 young men and 20 old men.By multi-slice helical CT,a computer reconstruction technique was used to produce three dimensional images and 3-D reconstruction data were analyzed quantitatively.Results Compared with the young men,old men increased with midface(Zy-Zy),lower face(Go-Go),supraorbital projection(Fb-Sr,T-So),midface depth (N-Po),and lower facial depth(T-Gn),and...

Objective To study the morphological characteristics of craniofacial contour in ageing.Methods Craniofacial morphology was examined in a sample of 20 young men and 20 old men.By multi-slice helical CT,a computer reconstruction technique was used to produce three dimensional images and 3-D reconstruction data were analyzed quantitatively.Results Compared with the young men,old men increased with midface(Zy-Zy),lower face(Go-Go),supraorbital projection(Fb-Sr,T-So),midface depth (N-Po),and lower facial depth(T-Gn),and decreased with maxillary height(N-Sd) and upper facial width(Ft-Ft,T-T).Conclusion Facial width and depth and supraorbital projection tend to be increased and facial height decreased with ageing.

目的了解面部轮廓老化的形态特征,为年轻化手术设计提供依据。方法采用计算机辅助三维CT重建技术,对20例老年人及20例青年人颅面形态结构做立体定量的比较分析。结果老年组在中面部(Zy-Zy)、下面部(Go-Go)、眶上嵴突(Fb-Sr,T-So)、头长(N-Po)、耳前颏下点距(T-Gn)都明显高于青年组,而上颌高(N-Sd)和上面宽(Ft-Ft,T-T)则明显低于青年组。结论随着年龄的增长,面部宽度、眶上嵴突及颅面深度有随之增加的趋势,而面部垂直高度有随之降低的趋势。

 
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