PPT-Embryonic Development Variations in Embryonic Germ Layers and Body Cavity

Formation of the Digestive Cavity At the Blastula stage the embryo forms a fluid filled ball of cells During Gastrulation the blastula caves in on one end to form a Gastrula The cavity formed by gastrulation will form a digestive cavity or digestive tract. Objectives. Explain prenatal development from fertilization to birth. Understand different biological process’ in all phases of prenatal development. Define key vocabulary. Chart different phases in . Cleavage. Cleavage. . Fertilization takes place in the ampulla of the oviduct. Cleavage takes place as the zygote moves down the oviduct towards the uterus. The . morula. enteres the uterus . 3 days. their functions. By. Dr. R. C. . Nath. ; Associate Professor. Department . of Zoology. Govt. Degree College, DMR. .. Fig: Chick’s egg with different regions. Definition of Extra Embryonic Membrane:. Voluntary regulation of the number of children produced and when they are conceived.. Coitus interrupts: withdrawal of the penis from the vagina before ejaculation.. Rhythm method: abstinence from sexual intercourse for several days before and after ovulation.. Definition of Extra Embryonic Membrane:. The blastoderm . . in birds , reptiles and mammals not only gives rise to embryo, but also to certain structures that lie outside the embryo. These extra embryonic structures are called Extra Embryonic Membrane.. Survey of Embryonic Development. Lab 11. Hormonal controls of the menstrual (ovarian and uterine) cycles . Fertilization, implantation, and early development. Final lab practical this time next week. Saha. Department. of Zoology. University. of . Rajshahi. What is stem cell?. An undifferentiated cell of a . multicellular. organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.. Developmental stages of humans. Fertilization. Zygote. It is a fertilized . egg . Diploid (2n). Female . pronuclei. Male . pronuclei. Amphimixis. Developmental stages of humans. Zona. . pellucida. Surrounds the zygote. Explain prenatal development from fertilization to birth. Understand different biological process’ in all phases of prenatal development. Define key vocabulary. Chart different phases in . somitogenesis. College of science. Biology Dept.. Zoology . 4. th. class. Embryology LAB.. (3). NAME :. 3. rd. week: Further development . The . embryo develops further by forming . three. germ . layers,the. process being known as . closely functioning tissues. . Diploblastic. , have only two cell layers… like hydra and jellyfish. . Triploblastic. and three cell layers. . The three “. germ layers”. are the . ectoderm. , . As the fluid inside the newly formed blastocyst increases, so does the number of cells, and the combination of these two features causes a progressive enlargement of the blastocyst and it’s cavity with a consequent progressive thinning of the zona . Ass.Lec.Reham.s.Kadhum. . Diyala. University . college of Medicine . Department of Anatomy . ,. Histology and Embryology . Second stage . First semester . Specific Objectives . At the end of the lecture you should know about:. Lab 11. Hormonal controls of the menstrual (ovarian and uterine) cycles . Fertilization, implantation, and early development. Final lab practical this time next week. Ovulation. Ovarian and Menstrual Cycle Regulation.