A Practical Approach, Second Edition=Ronald D. Ho.pdf

Posteriorcardinal veinsestablishedTen-somitestageFirst circulation 10–10.510.5 2.5 16–202,9,13,14,1810.5 10 10 8.5–8.752.4 16–20Duct of Cuvier(commoncardinal vein)Aortic arch III 11 3.3 21–25Posteriorcardinal;branches ofanteriorcardinal onmesencephalonSeptationoccurringFour aorticarches;I regressing,IV still smallAtrioventricularcanalEndocardialcushionsappearAortic archesIII, IV, & VIBeginninginterventricularseptumVitelline veinsanastomosewith liver plexus2,9,13,14,18,1769d 4h 20± 7,39 8 44 16.5 23 56 26± 7,397,10 10 8.5 10 10 8 10 10 15 10 10 23 10 10 23–25 7,10 10 1.5d 10 10,128.5 5,7,24 26 3 71 2d 18 2412.5 6.2 12 8.5 44 16.5 23 56 24 14 83 ca. 45h 15 882,9,13,14,1810 27± 7,93 9.75 24,2713.5 8.5 12 9 44 88,2417.511.5–12.511.75–134.2 29–3112 5.1 34–3512– 5.1–6 35–12.375 4010,12,242,9,13,14,18,242,9,13,14,182,9,13,14,18,2412.125 5.2 36 2,9,13,14,1812.125–135.2 36 2,9,13,14,18,2410.5–11.510,40,2413 34 10,249 44 16.5 23 56 27–28 33 28–31 4 7,24,93,50–55h 26 88,2429 56 24 14 83 ca 45h 15 889.25 10 19.5 10 28 10 28–37 3.5–6 10,24,74,90,99,104–11110 24 11.75 24 9.25 44 17.5 29 56 28–29 33 31–34 4–4.6 12,24,839d18h2.3d 26 10,243d 36 8825 16 83 3–4d ca.30–4426± 39,24 11 24 26–28 39,71 3–4d ca30–3410.5 7,24,939–10.511 24 9.5 44 19 35 56 29–30 33 32–35 6 24,93 4d 88,2476,24 12 24 8.5 29 44 29–35 6 24,76 4d 88,2412.5 6.2 12 10.5 39 9.25 44 26 398888,24COMPARATIVE FEATURES OF VERTEBRATE EMBRYOLOGY 165© 2006 by Taylor & Francis Group, LLC