By Thomas W. Sadler PhD
Langman's scientific Embryology covers embryology for clinical, nursing, and overall healthiness professions scholars with a powerful scientific emphasis. The textual content is very valued as a instructing and studying source for its scientific correlation packing containers, summaries, difficulties to unravel, illustrations and scientific photographs, and transparent, concise writing style—all of which make the subject material available to scholars and correct to teachers. on-line fabric comprises Simbryo—an animation software exhibiting methods, organs, and platforms constructing in human embryos—as good as evaluation questions and entire textual content on-line. A separate college picture financial institution and PowerPoint displays also are to be had.
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Extra info for Langman's Medical Embryology, 12th Edition
10 A. Section of a 107-cell human blastocyst showing inner cell mass and trophoblast cells. B. 5 days. Blue, inner cell mass or embryoblast; green, trophoblast. C. Schematic representation of a blastocyst at the sixth day of development showing trophoblast cells at the embryonic pole of the blastocyst penetrating the uterine mucosa. The human blastocyst begins to penetrate the uterine mucosa by the sixth day of development. become confluent, and finally, a single cavity, the blastocele, forms (Fig.
12). If fertilization does not occur, then the menstrual phase begins, and the spongy and compact endometrial layers are shed. The basal layer remains to regenerate the other layers during the next cycle (Fig. 13). Problems to Solve 1. What is the role of the corpus luteum, and what is its origin? 2. What are the three phases of fertilization, and what reactions occur once fusion of the sperm and oocyte membranes takes place? 3. What are the primary causes of infertility in men and women? 4. A woman has had several bouts of pelvic inflammatory disease and now wants to have children; however, she has been having difficulty becoming pregnant.
DAYS 11 AND 12 By the 11th to the 12th day of development, the blastocyst is completely embedded in the endometrial stroma, and the surface epithelium almost entirely covers the original defect in the uterine wall (Figs. 5). The blastocyst now produces a slight protrusion into the lumen of the uterus. 3 9-day human blastocyst. The syncytiotrophoblast shows a large number of lacunae. Flat cells form the exocoelomic membrane. The bilaminar disc consists of a layer of columnar epiblast cells and a layer of cuboidal hypoblast cells.