BRS Embryology, 5th Edition. Home · BRS BRS Physiology, 5th Edition (Board Review Series) · Read more Langman's Medical Embryology 11th edition. BRS Embryology 5th Edition. Table Of Contents: PREFERTILIZATION EVENTS; WEEK 1 OF HUMAN DEVELOPMENT (DAYS 1–7); WEEK 2 OF HUMAN. Preface The fifth edition of BRS Embryology has afforded me the opportunity to further I hope that students will continue to find BRS Embryology a clear and.
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The fifth edition of BRS Embryology has afforded me the opportunity to further larly represented on the USMLE Step 1, so that future editions of this book may. BRS Embryology (Board Review Series) 6th Edition, site Edition Highlight, take notes, and search in the book; In this edition, page numbers are just like the . BRS Embryology (Board Review Series) 5th (fifth) edition [Ronald W. Dudek] on meiriseamamo.ga *FREE* shipping on qualifying offers. For New condition books;.
The entire sperm except the cell membrane enters the cytoplasm of the secondary oocyte arrested in metaphase of meiosis II. The sperm mitochondria and tail degenerate. The sperm nucleus is now called the male pronucleus. Since all sperm mitochondria degenerate, all mitochondria within the zygote are of maternal origin i. The secondary oocyte completes meiosis II, forming a mature ovum and second polar body.
The nucleus of the mature ovum is now called the female pronucleus. Male and female pronuclei fuse, forming a zygote a new cell whose genotype is an intermingling of maternal and paternal chromosomes.
Cleavage is a series of mitotic divisions of the zygote. Zygote cytoplasm is successively partitioned cleaved to form a blastula consisting of increasingly smaller blastomeres 2-cell, 4-cell, 8-cell, and so on. In this book, age is presented as the fertilization age. Blastomeres form a morula by undergoing compaction, that is, tight junctions are formed between the cells in the outer cell mass, thereby sealing off the inner cell mass.
Uvomorulin, a glycoprotein found on the surface of blastomeres, is involved in compaction. Blastocyst formation involves fluid secreted within the morula that forms the blastocyst cavity.
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The conceptus is now called a blastocyst. The inner cell mass is now called the embryoblast becomes the embryo.
The outer cell mass is now called the trophoblast becomes the fetal portion of the placenta. Zona pellucida degeneration occurs by day 4 after conception. The zona pellucida must degenerate for implantation to occur. A The stages of human development during week 1.
B A day 7 blastocyst. The trophoblast proliferates and differentiates into the cytotrophoblast and syncytiotrophoblast. Failure of implantation may involve immune rejection graft-versus-host reaction of the antigenic conceptus by the mother. Ectopic tubal pregnancy ETP 1. ETP occurs when the blastocyst implants within the uterine tube due to delayed transport.
The ampulla of the uterine tube is the most common site of an ectopic pregnancy. The rectouterine pouch pouch of Douglas is a common site for an ectopic abdominal pregnancy.
ETP is most commonly seen in women with endometriosis or pelvic inflammatory disease. ETP leads to uterine tube rupture and hemorrhage if surgical intervention i.
ETP presents with abnormal uterine bleeding, unilateral pelvic pain, increased levels of human chorionic gonadotropin hCG but lower than originally expected with uterine implantation pregnancy , and a massive first-trimester bleed.
ETP must be differentially diagnosed from appendicitis, an aborting intrauterine pregnancy, or a bleeding corpus luteum of a normal intrauterine pregnancy. Testicular teratocarcinoma TCC 1. TTC is a germ cell neoplasm.
TCC contains well-differentiated cells and structures from each of the three primary germ layers: for example, colon glandular tissue endoderm , cartilage mesoderm , and squamous epithelium ectoderm. TTC also contains undifferentiated pluripotent stem cells called embryonic carcinoma EC cells.
TTC can be experimentally produced by implanting a blastocyst in an extrauterine site. The ability of blastocysts to form TTC suggests a relationship between the inner cell mass and EC cells. This relationship has been confirmed by isolation of cell lines from blastocysts called embryonic stem ES cells, which have biochemical characteristics remarkably similar to those of EC cells.
A year-old woman presents at the emergency department with severe abdominal pain on the right side with signs of internal bleeding. She indicated that she has been sexually active without contraception and missed her last menstrual period. Based on this information, which of the following disorders must be included as an option in the diagnosis?
When does a secondary oocyte complete its second meiotic division to become a mature ovum? How soon after fertilization occurs within the uterine tube does the blastocyst begin implantation? Where does the blastocyst normally implant? Which of the following events is involved in cleavage of the zygote during week 1 of development? A A series of meiotic divisions forming blastomeres B Production of highly differentiated blastomeres C An increased cytoplasmic content of blastomeres D An increase in size of blastomeres E A decrease in size of blastomeres 6.
Which of the following structures must degenerate for blastocyst implantation to occur?
Which of the following is the origin of the mitochondrial DNA of all human adult cells? Individual blastomeres were isolated from a blastula at the 4-cell stage. Each blastomere was cultured in vitro to the blastocyst stage and individually implanted into four pseudopregnant foster mothers.
Which of the following would you expect to observe 9 months later? Embryonic carcinoma EC cells were In oogenesis, which of the following isolated from a yellow-coated mouse with a teratocarcinoma. The EC cells were then microinjected into the inner cell mass of a blastocyst isolated from a black-coated mouse.
The blastocyst was subsequently implanted into the uterus of a white-coated foster mouse. Which of the following would be observed after full-term pregnancy? Ectopic tubal pregnancy must always be an option in the diagnosis when a woman in her reproductive years presents with such symptoms.
Ninety percent of ectopic implantations occur in the uterine tube. The uterine tube and embryo must be surgically removed. The symptoms may sometimes be confused with appendicitis.
At ovulation, a secondary oocyte begins meiosis II, but this division is arrested at metaphase. The secondary oocyte will remain arrested in metaphase until a sperm penetrates it at fertilization.
If fertilization does not occur, the secondary oocyte degenerates. The blastocyst begins implantation by day 7 after fertilization. The blastocyst implants in the functional layer of the uterine endometrium. The uterus is composed of the perimetrium, myometrium, and endometrium. Two layers are identified within the endometrium: 1 the functional layer, which is sloughed off at menstruation, and 2 the basal layer, which is retained at menstruation and serves as the source of regeneration of the functional layer.
During the progestational phase of the menstrual cycle, the functional layer undergoes dramatic changes; uterine glands enlarge and vascularity increases in preparation for blastocyst implantation. The book also includes radiographs, sonograms, computed tomography scans, and photographs of various congenital malformations. Clinical images have been placed closer to the relevant text. A companion website offers the fully searchable text and an interactive question bank. If you found this book helpful then please like, subscribe and share.
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BRS Embryology, 5th Edition
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Note that synapsis and crossing over occur only during meiosis I. Primordial germ cells migrate from the wall of the yolk sac during the week 4 of embryonic life and enter the gonad of a genetic male, where they remain dormant until puberty about age 12 years , when hormonal changes in the young man stimulate the production of sperm.
A B C D E 40, 35, 48 12 You can take a look at all the latest editions of the BRS series at allthingsmedicine.
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