. The development of the chick; an introduction to embryology . -Aorn. Fig. 73. — Entire embryo of 20 s, viewedas a transparent object from cranial flexvue and the rotation ofthe head of the embryo have madeconsiderable o. m., Oniplialo-mesenteric Fl., Cranial flexure. D. C, Duct ofCvivier. Dienc, Dience))halon. Mesenc, M(>t(>nc., Metencepha-lon. Myelenc. 1, and 2, Anterior andposterior divisions of the myelencepha-lon. Telenc, Telencephalon. Vel. tr.,Velum transversum. Other abbrevia-tions as before, x 30. cent to and surroiuKliiiu- tlie o
. The development of the chick; an introduction to embryology . -Aorn. Fig. 73. — Entire embryo of 20 s, viewedas a transparent object from cranial flexvue and the rotation ofthe head of the embryo have madeconsiderable o. m., Oniplialo-mesenteric Fl., Cranial flexure. D. C, Duct ofCvivier. Dienc, Dience))halon. Mesenc, M(>t(>nc., Metencepha-lon. Myelenc. 1, and 2, Anterior andposterior divisions of the myelencepha-lon. Telenc, Telencephalon. Vel. tr.,Velum transversum. Other abbrevia-tions as before, x 30. cent to and surroiuKliiiu- tlie oinbrvo, and a choriogenous zone,conipiisinii- the remainder. The method of formation of anniion and chorion is as follows: FROM TWELVE TO THIRTY-SIX SOMITES 137 (a diagrammatic outline is first given and a detailed descriptionfollows). The somatopleure becomes elevated in the form ofa fold surrounding the embryo; this fold begins first in front ofthe head of the embryo as the kead-fold of the amnion, which -YojTh Fig. 74. — Head of the same embryofrom the ventral side. Abbreviationsas before. fifP /s/A
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Keywords: ., bookcentury1900, bookdecade1900, bookiddevelopm, booksubjectbirds
