. Text-book of embryology. Embryology. 530 EMBRYOLOGY OF THE LOWER VERTEBRATES ch. the mesoderm segment. Immediately above the nephrotome, between it and the ectoderm, is seen the rudiment of the archinephric duct— a rod of cells which is gradually extending tailwards. In the centre of the section is the neural tube () with its thick walls and the solid notochordal rudiment (iV) lying immediately. Fig. 234a.—Transverse section through the middle of a second-day Fowl embryo (15 segments). A, paired dorsal aorta; , archinephric duct; ect, ectoderm; end, endoderm; my, myotome; N, notochor
. Text-book of embryology. Embryology. 530 EMBRYOLOGY OF THE LOWER VERTEBRATES ch. the mesoderm segment. Immediately above the nephrotome, between it and the ectoderm, is seen the rudiment of the archinephric duct— a rod of cells which is gradually extending tailwards. In the centre of the section is the neural tube () with its thick walls and the solid notochordal rudiment (iV) lying immediately. Fig. 234a.—Transverse section through the middle of a second-day Fowl embryo (15 segments). A, paired dorsal aorta; , archinephric duct; ect, ectoderm; end, endoderm; my, myotome; N, notochord ; , spinal cord ; som, somatopleure ; spl, splanchnopleure ; splc, splanchnocoele. below it. The blood-vessel (A) on each side between nephrotome and endoderm is the dorsal aorta which is at this stage double. Working back towards the tail end of the embryo it is seen that subsequent sections show less and less advanced stages of development. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
