Ebook High-yield embryology (5th edition): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook High-yield embryology (5th edition): Part 2
Ebook High-yield embryology (5th edition): Part 2
0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexu Ebook High-yield embryology (5th edition): Part 2ually indifferent or undifferentiated stage. This means that genetically female embryos and genetically male embryos arc phenotypically indistinguishable.c. DURING WEEK 7, the indifferent embryo begins phenotypic sexual differentiation.D.BY WEEK 12, female or male characteristics of the external gen Ebook High-yield embryology (5th edition): Part 2italia can be recognized.E.BY WEEK 20, phenotypic differentiation is complete.F.Phenotypic sexual differentiation is determined by the Sry gene locateEbook High-yield embryology (5th edition): Part 2
d on the short arm of the Y chromosome and may result in individuals with a female phenotype, an intersex phenotype, or a male phenotype. The Sty gene0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexu Ebook High-yield embryology (5th edition): Part 2erentiate to produce testosterone and Mullerian inhibiting factor (MIF), respectively. In the presence of TDF. testosterone, and M1F. the indifferent embryo will be directed to the male phenotype. In the absence of TDF, testosterone, and MIF, the indifferent embryo will be directed to the female phe Ebook High-yield embryology (5th edition): Part 2notype.0 Development III' the GonadsA. THE OVARY1The intermediate mesoderm forms a longitudinal elevation along the dorsal bodywall called the urogeniEbook High-yield embryology (5th edition): Part 2
tal ridge, which later forms the gonadal ridge.2Primary sex cords develop from the gonadal ridge and incorporate primordial germ cells (XX genotype), 0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexu Ebook High-yield embryology (5th edition): Part 2ly degenerates.3Secondary sex cords develop and incorporate primordial germ cells as a thin tunica albuginea forms.4The secondary sex cords break apart and form isolated cell clusters called primordial follicles, which contain primary- oocytes surrounded by a layer of simple squamous cells.6768 CHAP Ebook High-yield embryology (5th edition): Part 2TER 9B. RELATIVE DESCENT OF THE OVARIES1The ovaries originally develop within the abdomen but later undergo a relative descent into the pelvis as a reEbook High-yield embryology (5th edition): Part 2
sult of disproportionate growth.2The gubernaculum may also play a role. The gubernaculuin is a band of fibrous tissue along the posterior wall that ex0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexu Ebook High-yield embryology (5th edition): Part 2ues into the labia majora, forming the round ligament of the uterus.0 Development of Genital Duds (Figure 9-I)A.PARAMESONEPHRIC (MULLERIAN) DUCTS1The cranial portions of the paramcsonephric ducts develop into the uterine tubes.2The caudal portions of the paramcsoncphric ducts fuse in the midline to Ebook High-yield embryology (5th edition): Part 2form the uterovaginal primordium and thereby bring together two peritoneal folds called the broad ligament.3The uterovaginal primordium develops intoEbook High-yield embryology (5th edition): Part 2
the uterus, cervix, and superior 1/3 of the vagina.4The paramesonephric ducts project into the dorsal wall of the cloaca and induce the formation of t0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexu Ebook High-yield embryology (5th edition): Part 2ina.5Vestigial remnants of the paramesoncphric duct may be found in the adult female and arc called the hydatid of Morgagni.B.MESONEPHRIC (WOLFFIAN) DUCTS AND TUBULES1The mesonephric ducts develop in the female as part of the urinary system because these ducts are critical in the formation of the de Ebook High-yield embryology (5th edition): Part 2finitive metanephric kidney. However, they degenerate in the female after formation of the metanephric kidney.2Vestigial remnants of the mesonephric dEbook High-yield embryology (5th edition): Part 2
ucts may be found in the adult female, called the appendix vesiculosa and Gartner’s duct.3Vestigial remnants of the mesonephric tubules, called the ep0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexu Ebook High-yield embryology (5th edition): Part 2mesoderm around the cloacal membrane causes the overlying ectoderm to rise up so that three structures are visible externally, which include the phallus, urogenital folds, and labioscrotal swellings.B.The phallus forms the clitoris (glans clitoris, corpora cavernosa clitoris, and vestibular bulbs).c Ebook High-yield embryology (5th edition): Part 2. The urogenital folds form the labia minora.D. The labioscrotal swellings form the labia majora and mons pubis.Mesonephros0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexu0 The Indifferent EmbryoA.The genotype OÍ the embryo (46.XX or 46.XY) is established at fertilization.B.DURING WEEKS 1-6, (he embryo remains in a sexuGọi ngay
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