Ch.4 Market power and dominant firms Chapter 5. Non-linear pricing and price discrimination Ch. 6 Market power and product quality • Search goods • Experience goods and quality • Signaling high quality • Summary

一、泌尿系统的发生 1、肾、输尿管：来自间介中胚层 2、膀胱、尿道：来自尿生殖窦（内胚层）

一、原始消化管的形成和分段 第4周，胚盘卷褶，卵黄囊入胚体内，形成原始消化管

一、心血管系统的发生 (一)原始心血管系统的建立 1、血岛和胚内、外毛细血管的发生 卵黄囊壁胚外中胚层→血岛(blood island) 周边细胞变扁→内皮→原始血管 中央游离细胞→造血干细胞

一、气管 (一)黏膜 1、假复层柱状纤毛上皮 纤毛细胞:数量最多,纤毛摆动,将表面黏液及其尘埃、细菌等推向咽部 排出

第一节 肾动态显像 第二节 肾功能测定 Renal Functional Examination 第三节 肾静态显像 Static Renography 第四节 膀胱显像 Radionuclide Cystography

一、概述 (一)组成 卵巢:女性生殖腺,产生卵子,分泌性激素 输卵管:受精的场所,并将受精卵输送到子宫 子宫:孕育胎儿 乳腺:分泌乳汁,是哺乳的器官 外生殖器

(1) extra-embryonic blood vessels ---blood island: at the middle of 3 rd week, wall of the yolk sac mesenchyma proliferate and form isolated cell clusters, the peripheral cell become flattened and differentiate into endothelial cell to from endothelial tube; central located cells are detached and develop into primitive blood cells(blood stem cell)

digestive and respiratory system derived from primitive gut /foregut /midgut /hindgut ---epi. of digestive and respiratory system derived from endoderm ---CT and MT of digestive and respiratory system derived from splanchnic or visceral mesoderm

一、睾丸(testis) (一)生精小管(seminiferous tubule) 肌样细胞 基膜 生精上皮(spermatogenic epithelium) 1、生精细胞(spermatogenic cell) (1)精原细胞增生A型精原细胞(46,XY,2n(有丝分裂)