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、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）

(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)

4 Ⅰ型、Ⅱ型肺泡细胞的特点、功能 2 肺导气部的组成及结构变化规律 5 肺巨噬细胞的分布及功能 1 气管壁的光镜结构 3 肺呼吸部的组成及结构特点

一.一般构成: A.神经元(Neuron)传导电冲动。 B.神经胶质细胞(Neuroglia):有支持作用,并为神经元营造必要的工作环境

消化管壁的一般结构 胃黏膜的结构和功能 小肠黏膜的结构和功能壁C、主C、吸收C、潘氏C的EM 食管、胃和小肠结构的异同 消化管的淋巴组织及免疫功能

骨組織 組成〈細胞一骨細胞 細胞間質/大量力儿义厶塭沈着 (骨基質)膠原線維 無定形物質 骨骨組織 骨膜 力水员 関節軟骨

① Lymphocyte: a. T-lymphocytes: cytotoxic T cell: Tc C- kill the tumor cell, virus infective cell and foreign cell helper T cell: Th C- promotes activity of BLC and Tc C suppressor T cell: Ts C –regulate the function of BLC and TC

1.General feature: (1) contain more cells and less extracellular ground substance (2) Polarisaton: ---free outer surface: face air or other things ---basal surface: face underlying CT, havebasement membrane (3) Avascularity,but innervation: ---no blood vessels ---rich in nerve terminals

1. General features: （1) small number of cells and large amount of extracellular ground substance （2) extracellular is composed of fibers and amorphous ground substance-matrix （3) all of them originate from mesenchyme￾embryonal CT （4) have functions of connection, supporting, protecting, nutrition, defence and repairing