Development of Vertebrates

adrenal allantoic allantois amnion amphibians aortic arches artery axial becomes birds blastema blastocyst blastopore blood body branchial cardinal veins carotid cartilage caudal caval cavity cervical chick chorionic chromosomes cloacal cord cortex differentiation dorsal aorta early ectoderm embryo endoderm epiblast epidermis epithelium fetal fetus Figure folds follicles formation frogs ganglia gastrula germ cells gill glands gonad growth hatching hormone hypoblast hypophysis incubation invagination larvae lateral mesoderm layer lower mammals medulla membrane Mesencephalon mesenchyme mesenteric mesonephros metamorphosis muscles Nephric duct nephrons nephrostomes nerves neural plate neurula notochord organs ovary oviduct ovocytes ovulation pair period pharyngeal placenta placode plexus pouches primitive node primitive streak primordia pulmonary region respiratory rudiment salamanders segments septum sinus somites species sperms spinal stalk surface tail tailbud tion tissue tubules upper uterine vascular venous ventral vertebrates vesicle vessels visceral arches vitelline vitelline veins wall Witschi yolk sac