. The development of the chick; an introduction to embryology . 3p}pl. -p a G- h! i£ Fig. 80. — Sagittal section through the tail of an embryo of about 35 s. All., .\llantois. An. pi., Anal plate, c. C, Central canal of the neuraltui)e. CI., Cloaca. Ectani., Ectoderm of the amnion. Mesam., Mesodermof the amnion, pa. G., Post-anal gut. ]). i. p., Posterior intestinal A., Segmental arteries. Other abl)r-(\iations as before. the primordiiuu of the cloaca, from which, tlierefore. the neck ofthe allantois ai)pears to arise (Fig. 1S,3); at all stages of inculia-tion the neck of
. The development of the chick; an introduction to embryology . 3p}pl. -p a G- h! i£ Fig. 80. — Sagittal section through the tail of an embryo of about 35 s. All., .\llantois. An. pi., Anal plate, c. C, Central canal of the neuraltui)e. CI., Cloaca. Ectani., Ectoderm of the amnion. Mesam., Mesodermof the amnion, pa. G., Post-anal gut. ]). i. p., Posterior intestinal A., Segmental arteries. Other abl)r-(\iations as before. the primordiiuu of the cloaca, from which, tlierefore. the neck ofthe allantois ai)pears to arise (Fig. 1S,3); at all stages of inculia-tion the neck of the allantois forms an open connection Ijetweenthe cloaca atid the allantoic sac. The Umbilicus, ihe closin-e of the body-wall jirogicssivelyi-educes the conununication lietween the emhi-yonic and extra-embryonic body-cavity to a narrow chink between the volk-stalk FROM TWEL^E TO THIRTY-SIX SOMITES 145 and allantoic stalk on the one hand and the attachment of theamnion on the other. The umbilical cord thus consists of anouter tube continuous with the body-
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Keywords: ., bookcentury1900, bookdecade1900, bookiddevelopm, booksubjectbirds
