Embryo/Carnegie stages: Zygote | Morula | Blastula/Blastomere/Blastosphere | Gastrula/Gastrulation | Neurula | Fetus Mammalian embryogenesis is the process of cell division and cellular differentiation which leads to the development of a mammalian embryo. ... Embryology is the branch of developmental biology that studies embryos and their development. ... Fetal development is the process in which a fetus develops during gestation, from the time of conception until birth. ... Embryos (and one tadpole) of the wrinkled frog (Rana rugosa). ... In embryology, Carnegie stages are a standardized system of 23 stages used to provide a unified developmental chronology of the embryo. ... This article or section does not cite its references or sources. ... Morula is a stage of embryonic development in animals, including the 16-cell phase, the 32-cell phase, and the 64-cell phase. ... Blastulation. ... A blastomere is the structure which results from the divisions of a fertilised egg during embryonic development . ... The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum. ... 1 - blastula, 2 - gastrula; orange - ectoderm, red - endoderm. ... 1 - blastula, 2 - gastrula; orange - ectoderm, red - endoderm. ... A Neurula is an embryo at the early stage of development in which neurulation occurs. ... Fetus at eight weeks Foetus redirects here. ...

General: Archenteron | Blastopore | Hensen's node | Germ layer (Ectoderm, Endoderm, Mesoderm) | Histogenesis | Organogenesis | Branchial arch (1st) | Meckel's cartilage | Somite/Somitomere | Thyroglossal duct | Vitelline duct The archenteron is an indentation that forms early on in a developing blastula. ... A blastopore is an opening into the archenteron during the embryonic stages of an organism. ... Hensens Node is the organizer for gastrulation in birds. ... It has been suggested that organogenesis be merged into this article or section. ... The ectoderm is outermost of the three germ layers of the developing embryo, the other two being the mesoderm and the endoderm. ... The endoderm, sometimes refered to as entoderm, is one of the three germ layers of the developing embryo, the other two being the ectoderm and the mesoderm. ... The mesoderm is one of the three germ layers in the early developing embryo, the other two layers being the ectoderm and the endoderm. ... An Introduction to Histogenesis Histogenesis is defined as the formation of tissues and organs from undifferentiated cells (Encarta Dictionary). ... Organogenesis is a stage of animal development where the ectoderm, endoderm, and mesoderm are formed. ... Schematic of developing fetus with first, second and third arches labeled. ... It has been suggested that this article or section be merged into branchial arch. ... The cartilaginous bar of the mandibular arch is formed by what are known as Meckel’s cartilages (right and left) ; above this the incus is developed. ... In the developing vertebrate embryo, somites are masses of mesoderm distributed along the two sides of the neural tube and that will eventually become dermis (dermatome), skeletal muscle (myotome), and vertebrae (sclerotome). ... In the developing vertebrate embryo, the somitomeres are loose masses of paraxial mesoderm derived cells that form along each side of the neural tube towards the end of the third gestational week. ... The thyroglossal duct is an embryological anatomical structure which forms the connection between the initial area of development of the thyroid gland and its final position. ... At the end of the fourth week the yolk-sac presents the appearance of a small pear-shaped vesicle (umbilical vesicle) opening into the digestive tube by a long narrow tube, the vitelline duct. ...

Circulatory system: Primitive atrium | Primitive ventricle | Bulbus cordis | Truncus arteriosus | Foramen ovale | Ductus venosus | Ductus arteriosus | Aortic arches | Septum primum | Septum secundum | Cardinal veins Human circulatory system. ... The primitive atrium grows rapidly and partially encircles the bulbus cordis; the groove against which the bulbus cordis lies is the first indication of a division into right and left atria. ... The primitive ventricle becomes divided by a septum, the septum inferius or ventricular septum, which grows upward from the lower part of the ventricle, its position being indicated on the surface of the heart by a furrow. ... When the heart assumes its S-shaped form the bulbus cordis lies ventral to and in front of the primitive ventricle. ... For the medical condition with the same name, see Truncus arteriosus. ... In the fetal heart, the foramen ovale allows blood to enter the left atrium from the right atrium. ... In the fetus, the ductus venosus connects the left umbilical vein with the upper inferior vena cava. ... In the developing fetus, the ductus arteriosus (DA) is a shunt connecting the pulmonary artery to the aortic arch that allows much of the blood from the right ventricle to bypass the fetus fluid-filled lungs. ... This article focuses upon the multiple aortic arches present in the embryo. ... The cavity of the primitive atrium becomes subdivided into right and left chambers by a septum, the septum primum, which grows downward into the cavity. ... The septum secundum, semilunar in shape, grows downward from the upper wall of the atrium immediately to the right of the primary septum and foramen ovale. ... During development of the veins, the first indication of a parietal system consists in the appearance of two short transverse veins, the ducts of Cuvier, which open, one on either side, into the sinus venosus. ...

Nervous system: Neural development/Neurulation | Neural folds | Neural groove | Neural tube | Neural crest | Neuromere | Notochord | Optic vesicles | Optic stalk | Optic cup The nervous system of an animal coordinates the activity of the muscles, monitors the organs, constructs and also stops input from the senses, and initiates actions. ... The study of neural development draws on both neuroscience and developmental biology to describe the cellular and molecular mechanisms by which complex nervous systems emerge during embryonic development and throughout life. ... Neurulation is a part of organogenesis in vertebrate embryos. ... In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, make their appearance, one on either side of the middle line. ... Between the neural folds is a shallow median groove, the neural groove. ... The neural tube is the embryonal structure that gives rise to the brain and spinal cord. ... The neural crest, a component of the ectoderm, is one of several ridgelike clusters of cells found on either side of the neural tube in vertebrate embryos. ... Neuromeres are transient segments during the early development of the human brain. ... It has been suggested that Notogenesis be merged into this article or section. ... The eyes begin to develop as a pair of diverticula from the lateral aspects of the forebrain. ... The optic vesicles project toward the sides of the head, and the peripheral part of each expands to form a hollow bulb, while the proximal part remains narrow and constitutes the optic stalk. ... The outer wall of the bulb of the optic vesicles becomes thickened and invaginated, and the bulb is thus converted into a cup, the optic cup (or ophthalmic cup), consisting of two strata of cells). ...

Digestive system: Foregut | Midgut | Hindgut | Proctodeum | Rathke's pouch | Septum transversum For the Physics term GUT, please refer to Grand unification theory The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and... The foregut is the anterior part of the alimentary canal, from the mouth to the intestine, or to the entrance of the bile duct. ... The midgut is the portion of the embryo from which most of the intestines are derived. ... Hindgut is the posterior (caudal) part of the alimentary canal. ... A proctoduem is the back ectodermal part of an alimentary canal. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ...

Urinary/Reproductive system: Urogenital folds | Urethral groove | Urogenital sinus | Kidney development (Pronephros | Mesonephros | Ureteric bud | Metanephric blastema) | Fetal genital development (Wolffian duct | Müllerian duct | Gubernaculum | Labioscrotal folds) The urinary system is the organ system that produces, stores, and carries urine. ... It has been suggested that this article or section be merged into sex organ. ... The urogenital folds are an embryological structure which give rise to a portion of the external genitalia. ... The urethral groove is a temporary linear indentation on the underside (ventral side) of the male penis during embryonic development. ... The urogenital sinus (also known as the persistent cloaca) is a part of the human body while it is an embryo. ... In humans, the metanephros (adult kidney) begins as an aggregate of mesenchymal cells that are detectable by the fifth gestational week as two small areas in the intermediate mesoderm close to the pelvic aorta. ... Pronephros the most primitive of the three excretory organs that develop in vertebrate, corresponding to the first stage of kidney development. ... The mesonephros (Latin for middle kidney) is one of three excretory organs that develop in vertebrates. ... The Ureteric bud is a portion of the mesonephric duct. ... The Metanephric blastema (or metanephric mesenchyme) is one of the two embryological structures that give rise to the kidney (the other is the ureteric bud. ... This article or section is in need of attention from an expert on the subject. ... The Wolffian duct (also known as archinephric duct, Leydigs duct, and the mesonephric duct) is an paired organ found in mammals including humans during embryogenesis. ... The Müllerian ducts are paired ducts of the embryo which empty into the cloaca, and which in the female develop into the upper vagina, cervix, uterus and oviducts; in the male they disappear except for the vestigial vagina masculina and the appendix testis. ... The gubernaculum is a fold of peritoneum which attaches to the caudal end of the testes. ... The labioscrotal folds (or labioscrotal swellings) are paired embryonic structures that represent the final stage of development of the caudal end of the external genitals before sexual differentiation. ...

Uterine support: Placenta | Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) | Amniotic sac (Amnion, Chorion) | Yolk sac | Allantois | Trophoblast (Cytotrophoblast | Syncytiotrophoblast | Gestational sac) The uterus or womb is the major female reproductive organ of most mammals, including humans. ... The placenta is an ephemeral (temporary) organ present only in female placental mammals during gestation (pregnancy). ... A newborn at 45 seconds. ... Umbilical arteries carry deoxygenated blood from the fetus to the placenta in the umbilical cord. ... Fetal circulation; the umbilical vein is the large, red vessel at the far left The umbilical vein is a blood vessel present during fetal development that carries oxygenated blood from the placenta to the growing fetus. ... Whartons jelly is a gelatinous substance within the umbilical cord. ... amniotic sac The amniotic sac is a tough but thin transparent pair of membranes, which hold a developing embryo (and later fetus) until shortly before birth. ... The amnion is a membranous sac which surrounds and protects the embryo. ... Chorion can refer to the following things: Chorion is the outer membrane of the amniotic sac. ... The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation. ... Allantois is a part of a developing animal embryo. ... The trophoblast (from Greek threphein: to feed) is considered to be the first of all embryonic annexes. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... Syncytiotrophoblasts are cells found in the placenta of human embryos. ... The gestational sac is the only available intrauterine structure that can be used to determine if an intrauterine pregnancy (IUP) exists, until the embryo is identified. ...