10b Repro Sys III- Pregn Developmt
... enter The oocyte then undergoes its second meiotic division Fertilization occurs when the genetic material of a sperm combines with that of an oocyte to form a zygote ...
... enter The oocyte then undergoes its second meiotic division Fertilization occurs when the genetic material of a sperm combines with that of an oocyte to form a zygote ...
Human development notes
... -- inner cell mass -- trophoblast layer Late blastula Implantation Trophoblast cells "digest" their way into the uterine lining. Trophoblast cells will become the chorion. Urine tests for pregnancy detect hCG (human chorionic gonadotrophin). Gastrulation Formation of the three primary germ layers Ep ...
... -- inner cell mass -- trophoblast layer Late blastula Implantation Trophoblast cells "digest" their way into the uterine lining. Trophoblast cells will become the chorion. Urine tests for pregnancy detect hCG (human chorionic gonadotrophin). Gastrulation Formation of the three primary germ layers Ep ...
Gastrulation
... epiblast forms all three germ layers (plus extraembryonic membrane) hypoblast forms extraembryonic endoderm does not form any embryonic endoderm or mesoderm forms primordial germ cells Figure 5.16 ...
... epiblast forms all three germ layers (plus extraembryonic membrane) hypoblast forms extraembryonic endoderm does not form any embryonic endoderm or mesoderm forms primordial germ cells Figure 5.16 ...
the neural crest cells
... Each of the three germ layers gives rise to specific tissues and organs: • Ectoderm forms the outer layer. Ectoderm forms skin, hair, sweat glands, epithelium, brain and nervous system. • Endoderm forms the inner layer. The endoderm forms digestive, respiratory systems, liver, pancreas, all bladder ...
... Each of the three germ layers gives rise to specific tissues and organs: • Ectoderm forms the outer layer. Ectoderm forms skin, hair, sweat glands, epithelium, brain and nervous system. • Endoderm forms the inner layer. The endoderm forms digestive, respiratory systems, liver, pancreas, all bladder ...
Formation of Bilaminar Germ Disc (Second week of Development)
... Epithelial lining of respiratory tract Epithelial lining of gastrointestinal tract Glandular cells of liver & pancreas Epithelium of urinary bladder Epithelial parts of trachea, bronchi and lungs Epithelial parts of pharynx, thyroid gland, tympanic cavity, eustachian tube tonsils & ...
... Epithelial lining of respiratory tract Epithelial lining of gastrointestinal tract Glandular cells of liver & pancreas Epithelium of urinary bladder Epithelial parts of trachea, bronchi and lungs Epithelial parts of pharynx, thyroid gland, tympanic cavity, eustachian tube tonsils & ...
PPT
... •The outside layer of the gastrula is called the ectoderm. The inside layer is called the endoderm. ...
... •The outside layer of the gastrula is called the ectoderm. The inside layer is called the endoderm. ...
Early embryology
... Many vertebrate eggs have the concentrated at one end of the cell, known as the vegetal pole: telolecithal eggs. The other pole is more metabolically active and is called the animal pole. ...
... Many vertebrate eggs have the concentrated at one end of the cell, known as the vegetal pole: telolecithal eggs. The other pole is more metabolically active and is called the animal pole. ...
slides_5
... The hypoblast produces cells that migrate along the inside of the exocoelomic membrane These cells proliferate and gradually form a new cavity within the exocoelomic cavity. This new cavity is known as ...
... The hypoblast produces cells that migrate along the inside of the exocoelomic membrane These cells proliferate and gradually form a new cavity within the exocoelomic cavity. This new cavity is known as ...
Embryonic Development of Animals
... Develops all major organ systems and body organization specific to the species ...
... Develops all major organ systems and body organization specific to the species ...
Extraembryonic membranes
... The chorion cushions the embryo against mechanical shocks. The allantois functions as a disposal sac for uric acid. ...
... The chorion cushions the embryo against mechanical shocks. The allantois functions as a disposal sac for uric acid. ...
Introduction to Human Embryology: The First 4 weeks of Development
... Gut and Body Cavity formation: As the cranial and caudal ends of the embryo curve ventrally, they pull the endoderm with them, forming the foregut and hindgut. The yolk sac is in the middle of the foregut and hindgut, and together they make the inner tube of the body. The intraembryonic coelom forme ...
... Gut and Body Cavity formation: As the cranial and caudal ends of the embryo curve ventrally, they pull the endoderm with them, forming the foregut and hindgut. The yolk sac is in the middle of the foregut and hindgut, and together they make the inner tube of the body. The intraembryonic coelom forme ...
Development
... gastrula. The outside layer of the gastrula is called the ectoderm. The inside cell layer is the endoderm. As cell division and differentiation continue, the interior space fills up with cells of a third type called mesoderm. The mesoderm forms between the other two cell layers. Differentiation Diff ...
... gastrula. The outside layer of the gastrula is called the ectoderm. The inside cell layer is the endoderm. As cell division and differentiation continue, the interior space fills up with cells of a third type called mesoderm. The mesoderm forms between the other two cell layers. Differentiation Diff ...
1 2 - VCOMcc
... removes waste from fetus o Amniotic membrane = derived from epiblast o Amniotic cavity = fluid-filled space initially between the amniotic membrane and epiblast; increases in size to surround and support embryo/fetus o Chorion = gives rise to chorionic villi that invade the endometrium and promote t ...
... removes waste from fetus o Amniotic membrane = derived from epiblast o Amniotic cavity = fluid-filled space initially between the amniotic membrane and epiblast; increases in size to surround and support embryo/fetus o Chorion = gives rise to chorionic villi that invade the endometrium and promote t ...
Bilaminar germ disc Second week of development
... pregnancy Ectopic pregnancy- Outside the uterus Syncytiotrophoblast produces human chorionic gonadotropin (hCG); by the end of second week, it can be detected by radioimmunoassay (pregnancy test) ...
... pregnancy Ectopic pregnancy- Outside the uterus Syncytiotrophoblast produces human chorionic gonadotropin (hCG); by the end of second week, it can be detected by radioimmunoassay (pregnancy test) ...
1. dia - Semmelweis University
... -2 cell types will differentiate: - embryoblast (inner) - trophoblast (outer) ...
... -2 cell types will differentiate: - embryoblast (inner) - trophoblast (outer) ...
Embryology Complete
... membrane and a jelly like membrane Fertilization: the process of the sperm and egg fusing to form one nucleus Within 2-5 minutes, the fertilization membrane forms beneath the jelly coat to prevent the entry of other sperm Blastomeres: dividing zygote that is formed by progressively smaller cells Cle ...
... membrane and a jelly like membrane Fertilization: the process of the sperm and egg fusing to form one nucleus Within 2-5 minutes, the fertilization membrane forms beneath the jelly coat to prevent the entry of other sperm Blastomeres: dividing zygote that is formed by progressively smaller cells Cle ...
Embryonic Development
... A. Development from a zygote to a gastrula 1. Fertilization – fusion of pronuclei to form a zygote 2. Cleavage – formation of blastomeres (2-, 4-, 8- and 16-cell stages) 3. Morula 4. Blastula i. Inner cell mass (ICM) ii. Blastocoele (blastocyst cavity) iii. Trophoblast 5. Gastrulation – formation of ...
... A. Development from a zygote to a gastrula 1. Fertilization – fusion of pronuclei to form a zygote 2. Cleavage – formation of blastomeres (2-, 4-, 8- and 16-cell stages) 3. Morula 4. Blastula i. Inner cell mass (ICM) ii. Blastocoele (blastocyst cavity) iii. Trophoblast 5. Gastrulation – formation of ...
Human embryogenesis
Human embryogenesis is the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, human development entails growth from a one celled zygote to an adult human being. Fertilisation occurs when the sperm cell successfully enters and fuses with an egg cell (ovum). The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences. Embryogenesis covers the first eight weeks of development and at the beginning of the ninth week the embryo is termed a fetus.Human embryology is the study of this development during the first eight weeks after fertilisation. The normal period of gestation (pregnancy) is nine months or 38 weeks.The germinal stage, refers to the time from fertilization, through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days.During this stage, the zygote, which is defined as an embryo because it contains a full complement of genetic material, begins to divide, in a process called cleavage. A blastocyst is then formed and implanted in the uterus. Embryogenesis continues with the next stage of gastrulation when the three germ layers of the embryo form in a process called histogenesis, and the processes of neurulation and organogenesis follow. The embryo is referred to as a fetus in the later stages of prenatal development, usually taken to be at the beginning of the ninth week. In comparison to the embryo, the fetus has more recognizable external features, and a more complete set of developing organs. The entire process of embryogenesis involves coordinated spatial and temporal changes in gene expression, cell growth and cellular differentiation. A nearly identical process occurs in other species, especially among chordates.