【摘要】 鸡胚发育到55h,在第2鳃弓腹端咽底面形成一盲孔,系甲状舌管原基。到第5d甲状腺芽脱离咽底壁,移向胸腔入口。第9d,甲状腺的实质形成许多小腺泡,腺泡由数个单层立方上皮组成。第12d,腺泡腔内有少量分泌物,腺泡间有结缔组织、微血管及血窦,被膜明显,直到出壳。甲状旁腺的两对原基发生于第3、4咽囊后壁的上皮。到第6d呈圆形实心细胞团。第9d间质内出现微血管,直到出壳。肾上腺的肾间组织来自中胚层的腹腔上皮,嗜铬细胞来自外胚层的神经崤细胞。孵化到第7d,肾上腺的轮廓开始形成,肾间组织细胞索深染,嗜铬组织细胞团浅染。第11d肾间组织细胞索间有嗜铬细胞团,血窦及结缔组织。第16d,被膜内有交感神经元存在。到第18d,肾上腺与后肾完全分开。更多还原

【Abstract】 When the chicken embryo has been incubated about 55 hours. the primordium of the thyroid lingual duct began to develop at the floor of the branchial arch Ⅱ. About 5 days after incubation, the thyroid bud migrated to anterior region of thoracic cavity. At the 9th day, The perenchyma of thyroid gland consisted of some small follicules, the walls of which were lined by few simple cuboidal epithelium At the 12nd day, the follicules had secretes in cavity. There were abound connective tissues、capillaries and sinusoids among the follicules, still the 21st day of hatching. The primodeums of two pairs parathyroid gland arose from the epithelium Iaminae of the back wall of visceral pouches Ⅲ and Ⅳ, At the 6th day. parathyroid glands showed small round solid cell mass. About the 9th day, there were many capillaries in mesenchyme until the 21st day of hatching. The interrenal tissue of adrenal gland arose from coelomic epithelium of mesoderm The chromoffin tissue came from neural crest of ectoderm. At the 7tn day. the outliue of the adrenal gland showed that the ce(?) cords of interrenal tissue were black, and the chromoffin cells were light. At the (?)th day, chromoffin tissues, sinusoids and connective tissues appeared among the interrenal tissues, About the 16th day the sympathetic neurons lay in the capsule, At the 18the day adrenal glands were separated from metanephros更多还原