An Atlas of the Human Embryo and Fetus: A Photographic Review of Human Prenatal Development
With hundreds of original photographs, optical micrographs and scanning electron micrographs, this atlas describes the progress of the embryo throughout its development, highlighting the formation and differentiation of organ structures. From the preembryonic and embryo stages to the development of the skeleton and striated muscle, organogenesis of the heart, and development of external genitalia, it provides authoritative answers to the most frequently asked question about the human embryo. With its plethora of outstanding photographs and images, experienced embryologists as well as clinicians and students can compare historical ideas with photographic reality.
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adjacent amniotic sac aorta aortopulmonary segment bilaminar bisegmented blastocyst blastomeres bones brain vesicles capillaries cartilage cartilaginous cavity CHAPTER chorionic villi chromosomes closing neural tube connecting stalk delineated developmental differentiation distinct ectoderm embryo Figure embryonic disk embryonic heart endoderm fertilization fetus fingers fluid formation formed fuse genes germ disk germ layers gonadal heart loop heart tube inner cell mass labioscrotal folds lateral view left atrium left ventricle limb buds located male medullary tube membrane mesencephalon mesenchyme mesoderm Microscopic section midline Müllerian ducts Nasal pits nasal ridge neural crest neural groove neural tube neuroectoderm notochordal notochordal canal notochordal plate olfactory placodes oocyte organs ossification ovaries pharyngeal arches placenta primary mesoderm primary yolk sac primitive primordia primordial germ cells pulmonary artery right atrium scanning electron microscopy sclerotomes septum skeleton somite pairs spermatozoon stage tissue translucent view trilaminar trophoblast trophoblastic shell umbilical uterus veins venous ventral vertebral vessels view Figure yolk sac zona
Page 2 - Up at the end of the fourth week; at the end of the fifth week walked along the bed by holding on.
Page 15 - If the embryochorionic circulation does not develop, or fails, the conceptus is aborted. The embryo cannot survive without the chorion (placenta), and the chorion will not survive without the embryo. Avascular degenerated chorionic villi constitute the hydatidiform mole (Figure 2.9).
Page 15 - The embryonic heart begins beating on about day 22-23, accepting blood corpuscles from the yolk sac and pushing blood into the circulation. The embryonic blood begins circulating at the end of the 4th week of development.
Page 13 - The spermatozoon moves, using the flagellum or tail, and the total length of the spermatozoon including the tail is about 60 p.
Page 13 - A human being originates from two living cells: the oocyte (female germ cell) and the spermatozoon (male germ cell), transmitting the torch of life to the next generation. The oocyte is a large cell, approximately 120p in diameter, which develops a thick surrounding membrane, known as the zona pellucida.