Placental development by dr najeeb biography

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Home - Dr. Table of Contents Toggle. Also Read Dr. Development up to 3rd week Trileminar Disc part 1. Development up to 3rd week Trileminar Disc part 2. Development up to 3rd week Trileminar Disc part 3. Development of Vascular System part 1. Development of Vascular System part 2. Development of Vascular System part 3. Development of Vascular System part 4.

Development of Placenta part 1. Development of Placenta part 2. Development of Nervous System part 1. Development of Nervous System part 2. Musculo Skeletal Development part 1. Musculo Skeletal Development part 2. Musculo Skeletal Development part 3. Enrolling in a course is simple! Just browse through our website, click on the "Buy Now" button.

Follow the prompts to complete the enrolment process, and you'll gain immediate access to the course materials. Can I access the course materials on any device? After some time baby develops special covering around it and placenta. During pregnancy, Estrogen and progesterone remains high. First half of cycle is not fixed. Estrogen inc. Rest by placenta.

Inc progesterone. Fertilization mostly in Ampulla. Fimbriae are processes. Cilia produce small fluid currents and help in picking up ovum. In semen, an enzyme is activated here that causes some part of semen to coagulate and stick to cervix so it may not drain out. This is released by seminal vesicles. Its name is Vesiculase enzyme. So, sperms slow down.

Sperms rapidly jump from vagina to cervix. Normally there is mucus plug in cervix canal. Fructose is in rich amounts in semen. Mitochondria are in middle piece of sperm. All mitochondria of spermatozoa come together and make middle piece. So, sometimes after some days, they are seen moving. Cilia also play a minor role. Sperms detect them and move there restarting movement.

Acrosome reaction. It binds sperm to zona pellucida as well as induces acrosome reaction. Membranes lockup due to interaction of integrins and disintegrins. This ensures sperms do not fall away. This is cortical reaction. These enzymes cause zona pellucida and ovum impermeable to remaining sperms. This is Zona reaction. Only sperm goes in leaving membrane.

M2 is completed in ovum bcz before this sperm had single structured 23 chromosomes while ovum had double structured 23 chromosomes. Almost all cytoplasm of ovum after M2 goes to ovum. Now this is definitive ovum. Cytoplasm also disappears. Pro-nuclei double their DNA. Double structured chromosomes. Come together and fuse. Completion of M2 Metabolic activation of ovum induced by sperm.

Now we have 46 double structured chromosomes. In metaphase, these are rearranged on metaphase plate. Centromere breaks and two cells formed ultimately. Chromatids move opposite poles.

Placental development by dr najeeb biography

Metabolic activation of ovum and initiation of cleavage. Fertilized ovum will undergo cleavage. Previously chromosomes were arranged on metaphase plate. Now, chromosomes start close. This is compaction. They develop electrical contacts gap junctions with each other bcz at multiple points membranes fuse. Metabolic products, signals, ions can go through and cells can communicate.

This compact inner cell mass will make baby. Outer mass will make covering of baby and placenta. Inner cells are going to make segregating. Break at centromere longitudinally. Chromatids move to opposite poles. During this, cell develops deep furrow. When chromatids reach poles, furrow deepens and cell divides. Both cells have 46 double structured chromosomes.

This fluid filled cavity is cyst. This structure is hence Blastocyst. Inner cell mass is called embryoblast now. Outer cell mass is trophoblast. Blastocyst comes out as chicken comes out of a shell hatch out. This is 5th day. Uptill now ovum is in fallopian tube. This is about 20th day if ovulation happened at 14th day. Corpus luteum is producing progesterone.

Less commonly in Fundus. Receptors are special type of sugars. Blastocyst loosely attaches with sugar molecules by Selectins. Cytotrophoblast and Syncytiotrophoblast. Epiblast and Hypoblast. Amniotic cavity and Chorionic cavity. Splanchnopleuric and Somatopleuric. Becomes polyhedral. Accumulate lot of glycogen, lipids as source of nutrition and becomes edematous.

This change spreads to all endometrium. Each having membrane. Each having one nucleus. Lacunae get connected around 10th and 11th day. This is 27th day, Time of menstruation also. It may result in wrong calculation of expected date of delivery. These are called Primary Villi. These cells make cuboidal cell layer facing cavity. Columnar cells facing newly developed cavity.

Cuboidal cells facing Blastocystic cavity. Amniotic cavity is lined by Amnioblast and Epiblast. This connective tissue moves up as well between Amnioblast and Cytotrophoblast. Since this C. T is outside embryo Proper germ layerthis is called extraembryonic mesoderm. Also connected to chorionic cavity by same stalk. An area of thickness called prechordal plate at cephalic end.

This is area where both layers are very close to each other. This is Primitive streak. Cells from center of Primitive streak and Primitive node disappear. Line within primitive streak where cells are deficient is called Primitive groove. Central depression in primitive node is called Primitive pit. This substance moves laterally and neighboring cells proliferate rapidly and then migrate.

Hypothalamic cells held by E-Cadherins Sticky. FGF8 reduces reduces concentration of E-Cadherins to make migration of cells possible. Embryology is the branch of biology that studies the development of embryos in animals, humans, and other organisms. This course provides a comprehensive understanding of the processes and stages of embryonic development, including fertilization, cleavage, gastrulation, organogenesis, and fetal development.

Students will explore the intricate mechanisms behind the formation of tissues, organs, and body systems during prenatal development. Learn live with top educators, chat with teachers and other attendees, and get your doubts cleared. Our curriculum is designed by experts to make sure you get the best learning experience.