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primitive groove
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  相似匹配句对
     In the primitive subsect.
     在原始的菝葜叶铁线莲亚组subsect.
短句来源
     Olfactory groove meningioma
     嗅沟脑膜瘤
短句来源
     Pulse Of Primitive Culture
     激活原始文化的脉搏——记法国盖布朗利博物馆
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     And the strength of the groove was evaluated.
     并对减应力区的强度进行了分析。
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  primitive groove
Over the course of the next day the primitive groove becomes deeper and elongates to occupy about half the length of the embryo.
      
Epiblast cells ingressing through the primitive groove migrate to form the lateral mesoderm flanking the midline.
      


The formation of the embryo—axis of Mongolian sheep embryos act on determining the developmental derection of the organic systems. The primitive streak initially developes at about 12days 23hours 47min utes after coitus, at the begining from the caudal node of the embryonic disc, the midline ectodermal surface thickenes and begin to migrate forward in Cephalic end to form the primitive streak, subsequently the primitive node. primitive grooveprimitive pit, head process and neural plate appear in...

The formation of the embryo—axis of Mongolian sheep embryos act on determining the developmental derection of the organic systems. The primitive streak initially developes at about 12days 23hours 47min utes after coitus, at the begining from the caudal node of the embryonic disc, the midline ectodermal surface thickenes and begin to migrate forward in Cephalic end to form the primitive streak, subsequently the primitive node. primitive grooveprimitive pit, head process and neural plate appear in turn. The primitive streak is base on developing the embryo—axis. By 13 days 5 minutes after coitus, the head process invaginating in the primitive pit move straight forward in cephalic derection to form the notochordal cord. atabout 14 days 15 hours, the notochordal cord betweenthe entodermal and ectodermal layers becames into the empty notochordal canal. The floor of the notochordal canal fuses with the underlying endoderm and subseguently the partial floor disappears, opens into the yolksac, form the neurenteric canal temporarily. The notochordal cord is the central axis to form vertebral column of the embryos. The first pair of somites arises at about 15 days3hours 20minutes after coitus about 16days 14hcurs 5minutes after coitus, the 6th pair of somites appear. at the stage, the intermediate mesoderm with the lateral plate clearly saw on each side cf the somites. The interembryonic cavities found on each side of the foregut only. Development of the somites are the base of the organic primodium paired off development of the skeletal system muscular system and urinary—genital system etc. The neural plate at the early stage occurs approximately at 14 bays2 hours 20minutes after coitus. During by developing to 16 days 14 hours 3 minutes, the neural folds of the lateral edges of the neural groove gradully approach each other in the dorsimidline, where they fuse into the neural tube. It is the primordium of the fufure central nervous sys tem of the embryonic body. In a 14 days 5 hours to 16 days 14 hours 5 minutes after coitus, the chorion(serosa)shaws long—visicle shape length 35cm. The yolk tube s longitypical canal length 30cm. The amonion follows the embryonic development, it is wider than the embryonic body. The allantois shaws criscentic visicle developing from the kind—gut of the embryo.

蒙古绵羊胚胎胚中轴的形成,对各器官系统的发生起着定向发育的作用。原条最初发生于交配后12天23时47分。从胚盘后结开始外胚层表面的中线加厚並向前延伸形成原条。随后,原结、原沟、原窝、头突及神经板相继出现。原条是胚中轴发生的基础。交配后13时5分,原窝底部的头突向前延伸形成管索管。交配后14天15时,脊索在内外胚层间形成空心的脊索管。脊索管的底部与内胚层融合。进而消失开口于卵黄囊,形成临时性的神经肠管。脊索是胚胎椎柱形成的中轴。胚胎的第1对体节,发生于交配后15天3时20分。交配后15天15时35分为3对体节(图1),交配后16天14时3分,已出现6对体节(图2)。此时,体节两侧的间中胚层及侧扳分界清楚。胚内体腔仅见于前肠两侧。体节的发生是胚胎的骨骼、肌肉、及尿殖系统等对称发育的基础。早期的神经扳,大约发生于交配后14天2时20分。当胎胚发育到16天14时3分,神经沟两侧的神经皱逐渐在背中线吻合,形成神经管。神经管是胚体未来中抠神经系统的原基。交配后14天5时至16天14时5分,绒毛膜呈长囊状,长约35cm。卵黄管呈细长的管状,长约30cm。羊膜随胚体发育,比胚体稍宽大。尿囊呈半月形囊,发生于胚胎的后肠。

 
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