By Samuel Webster, Rhiannon De Wreede
Embryology at a look is a hugely illustrated and cutting edge creation to key embryological strategies, with concise, memorable descriptions of significant embryological advancements. This re-creation covers the fundamental ideas of human improvement, from mitosis and meiosis, sooner than exploring the first formation of every physique approach, together with the improvement of the musculoskeletal, circulatory, digestive, reproductive, and anxious platforms through the foetal and neonatal sessions. Key positive factors contain: New chapters on phone signalling genes, stem cells, and antenatal screening for universal congenital and genetic defects complete color images and illustrations hyperlinks to scientific perform highlighted all through Timelines of every developmental level MCQs and EMQs for revision and evaluation A significant other web site at www.ataglanceseries.com/embryology that includes 15 fresh animations, and podcasts to assist sincerely clarify the procedures that ensue in the course of improvement. an extra teacher source includes a picture financial institution of all of the figures from the booklet to help educating this attention-grabbing region Embryology at a look offers the suitable substitute to the overpowering element visible in traditional embryology texts. It offers simply the proper point of element on embryology and congenital abnormalities for all scientific scholars and well-being pros to enhance a radical realizing of human improvement and its implications for scientific practice.
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Extra info for Embryology at a Glance (2nd Edition)
They continue to divide by mitosis until they become primary spermatocytes. The cytoplasmic bridges will maintain connections between a group of cells during spermatogenesis, synchronising the process and batch producing groups of spermatozoa. The primary spermatocytes enter meiosis I. Homologous recombination of chromosomes occurs in this stage. One primary spermatocyte becomes two secondary spermatocytes. These cells are now haploid. Each secondary spermatocyte may contain an X or a Y sex chromosome.
Linked pools of maternal blood are filled by spiral arteries of the endometrium, themselves branches of the uterine arteries. Foetal blood enters the placenta through the two umbilical arteries, which branch and continually divide until they reach the looping capillaries of the chorionic villi. 3). In the villi the syncytiotrophoblasts and endothelium create the barrier between maternal and fetal blood. Due to the syncytiotrophoblasts’ multinucleated structure the nuclei gather in certain places (proliferation knots) leaving other areas free of nuclei.
A week after the chorionic villi appear the basic structure of the placenta has formed and the embryo has developed a primitive circulatory system (see Chapter 27). 1), we might say that the main event of the third week of development is the formation of the trilaminar disc. The process by which this takes place is called gastrulation. The purpose of gastrulation is to produce the three germ layers from which embryonic structures will develop: ectoderm, mesoderm and endoderm. 2). The primitive streak runs as a depression on the epiblastic surface of the bilaminar disc and is restricted to the caudal half of the embryo.