Conceptus – anything developed from fertilized egg
... endometrium. On the exterior of the shell, anchoring stem chorionic villi grow outward with terminal branch chorionic villi extending from them. The chorion now consists of outer structures of the trilaminar disc, the extraembryonic mesoderm, cytotrophoblast, and syncytiotrophoblast, and creates the ...
... endometrium. On the exterior of the shell, anchoring stem chorionic villi grow outward with terminal branch chorionic villi extending from them. The chorion now consists of outer structures of the trilaminar disc, the extraembryonic mesoderm, cytotrophoblast, and syncytiotrophoblast, and creates the ...
Zoo_Unit4_Phylogenetics_Development Tutorial
... embryo, called a gastrula, that has a primitive gut (archenteron). ...
... embryo, called a gastrula, that has a primitive gut (archenteron). ...
Biology Chapter 43-2 Human Development
... Develops into: skeleton, muscles, excretory system, circulatory system, gonards Endoderm -one of the three cell layers formed by gastrulation Develops into: digestive tract, respiratory system, liver, and pancreas Amnion- one of the membranes that surround, protects, and nourishes the developing emb ...
... Develops into: skeleton, muscles, excretory system, circulatory system, gonards Endoderm -one of the three cell layers formed by gastrulation Develops into: digestive tract, respiratory system, liver, and pancreas Amnion- one of the membranes that surround, protects, and nourishes the developing emb ...
blastula stage
... an abnormal birth when the buttocks of the baby present itself instead of its head. chorion the extraembryonic membrane which is composed of blood vessel filled projections that will grow into the endometrium of the uterus and will eventually become the fetal portion of the placenta. cleavage rapid ...
... an abnormal birth when the buttocks of the baby present itself instead of its head. chorion the extraembryonic membrane which is composed of blood vessel filled projections that will grow into the endometrium of the uterus and will eventually become the fetal portion of the placenta. cleavage rapid ...
Premedical XXI
... (mitosis). Cell differentiate and create a threedimensional form = morphogenesis ...
... (mitosis). Cell differentiate and create a threedimensional form = morphogenesis ...
Implantation
... Fertilization restore the diploid number of chromosomes and determine the sex of the zygot. ...
... Fertilization restore the diploid number of chromosomes and determine the sex of the zygot. ...
1.Lecturenotes(fertilization
... - Expansion of the extraembyronic coelom, also known as the chorionic cavity reshapes the exocoelomic cavity or primitive yolk sac into a secondary yolk sac and pinches off small remnants of the primitive yolk sac or exocoelomic cysts. - The extra-embryonic somatic mesoderm and adjacent cytotrophobl ...
... - Expansion of the extraembyronic coelom, also known as the chorionic cavity reshapes the exocoelomic cavity or primitive yolk sac into a secondary yolk sac and pinches off small remnants of the primitive yolk sac or exocoelomic cysts. - The extra-embryonic somatic mesoderm and adjacent cytotrophobl ...
Chapter concepts
... - Expansion of the extraembyronic coelom, also known as the chorionic cavity reshapes the exocollomic cavity or primitive yolk sac into a secondary yolk sac and pinches off small remnants of the primitive yolk sac or exocoelomic cysts. - The extra-embryonic somatic mesoderm and adjacent cytotrophobl ...
... - Expansion of the extraembyronic coelom, also known as the chorionic cavity reshapes the exocollomic cavity or primitive yolk sac into a secondary yolk sac and pinches off small remnants of the primitive yolk sac or exocoelomic cysts. - The extra-embryonic somatic mesoderm and adjacent cytotrophobl ...
Embryonic Development
... skeletal system, muscles, circulatory, respiratory; dermis of skin; 5.coelom – body cavity surrounded by mesoderm may form in which the organs are held 6.an opening appears on one side of the gastrula, then extends the length of the gastrula and opens to the opposite side forming the digestive trac ...
... skeletal system, muscles, circulatory, respiratory; dermis of skin; 5.coelom – body cavity surrounded by mesoderm may form in which the organs are held 6.an opening appears on one side of the gastrula, then extends the length of the gastrula and opens to the opposite side forming the digestive trac ...
lecture1
... multicellular organisms contain a special material the GERMPLASM that faithfully transmits the complete hereditary makeup of the species from one generation to the next. FERTILISATION – The fusion of the male gamete and the female gamete to form an embryo. Fertilization is very important step in emb ...
... multicellular organisms contain a special material the GERMPLASM that faithfully transmits the complete hereditary makeup of the species from one generation to the next. FERTILISATION – The fusion of the male gamete and the female gamete to form an embryo. Fertilization is very important step in emb ...
EMBRYOLOGY GENERAL EMBRYOLOGY SECOND WEEK
... 3-The Amniotic cavity becomes much larger. 4-Some cells from the Endoderm layer creeps on the inner surface of the cytotrophoblast forming what is called Heuser's membrane which becomes continuous with the edges of the Endoderm& forming the primary yolk sac(it's roof is by Endoderm & it's floor by H ...
... 3-The Amniotic cavity becomes much larger. 4-Some cells from the Endoderm layer creeps on the inner surface of the cytotrophoblast forming what is called Heuser's membrane which becomes continuous with the edges of the Endoderm& forming the primary yolk sac(it's roof is by Endoderm & it's floor by H ...
Saladin, Human Anatomy 3e
... multinucleate mass called the syncytiotrophoblast, which grows rootlets into the endometrium. The endometrium grows over the blastocyst and soon completely covers it. 7. The third major event is embryogenesis. During this stage, the embryo becomes bilaterally symmetric and develops three primary ger ...
... multinucleate mass called the syncytiotrophoblast, which grows rootlets into the endometrium. The endometrium grows over the blastocyst and soon completely covers it. 7. The third major event is embryogenesis. During this stage, the embryo becomes bilaterally symmetric and develops three primary ger ...
Embryology II 2008 Cleavage Zygote Blastomeres Morula Blastocyst
... cytotrophoblast - (squamous epithelium) lining of blastocyst cavity – exocoelomic Heuser´s membrane Blastocyst cavity is also called exocoelomic cavity or primary yolk sac Extraembryonic reticulum (extracellular matrix) is produced between Heuser´s membrane and cytotrophoblast ...
... cytotrophoblast - (squamous epithelium) lining of blastocyst cavity – exocoelomic Heuser´s membrane Blastocyst cavity is also called exocoelomic cavity or primary yolk sac Extraembryonic reticulum (extracellular matrix) is produced between Heuser´s membrane and cytotrophoblast ...
Invertebrates - Cloudfront.net
... • Most primitive animals (>570myo) – Related to subgroup of animal-like protista ...
... • Most primitive animals (>570myo) – Related to subgroup of animal-like protista ...
Reference for embryology
... ectoderm will give rise to the epithelium which covers the surface; the inner endoderm to the epithelial lining of the digestive tube. As the archenteron enlarges, the old blastocoel becomes smaller and finally disappears. The gastrula stage is as far as we will study the embryology of the sea star. ...
... ectoderm will give rise to the epithelium which covers the surface; the inner endoderm to the epithelial lining of the digestive tube. As the archenteron enlarges, the old blastocoel becomes smaller and finally disappears. The gastrula stage is as far as we will study the embryology of the sea star. ...
MS Word worksheet
... 6. Indicate the origin and location of somites in the embryo, then name two structures that will develop from somites. ...
... 6. Indicate the origin and location of somites in the embryo, then name two structures that will develop from somites. ...
development - World of Teaching
... • Gestation lasts 266 days from fertilization to birth • Development begins in the oviduct – About 24 hours after fertilization, the zygote has divided to form a 2-celled embryo – The embryo passes down the oviduct by cilia and peristalsis – The zona pellucida has dissolved by the 5th day, when the ...
... • Gestation lasts 266 days from fertilization to birth • Development begins in the oviduct – About 24 hours after fertilization, the zygote has divided to form a 2-celled embryo – The embryo passes down the oviduct by cilia and peristalsis – The zona pellucida has dissolved by the 5th day, when the ...
Trophoblast will differentiate into 2 layers
... become bound tightly together with the formation of desmosomes and gap junctions, becoming nearly indistinguishable. This process is known as compaction. The cells of the morula then secrete a viscous liquid, causing a central cavity to be formed, forming a hollow ball of cells known as the blastocy ...
... become bound tightly together with the formation of desmosomes and gap junctions, becoming nearly indistinguishable. This process is known as compaction. The cells of the morula then secrete a viscous liquid, causing a central cavity to be formed, forming a hollow ball of cells known as the blastocy ...
323Lecture1 - Dr. Stuart Sumida
... • Zona reaction prevents fertilization by multiple sperm • 23 chromosomes from oocyte & sperm makes 46 total • Fertilized egg is called a zygote, oocyte metabolic activity increases, and cleavage begins ...
... • Zona reaction prevents fertilization by multiple sperm • 23 chromosomes from oocyte & sperm makes 46 total • Fertilized egg is called a zygote, oocyte metabolic activity increases, and cleavage begins ...
Human Reproduction pt.2
... The fertilized egg is called a zygote. Activation of the metabolic machinery of the zygote also begins a process of repeated cell division called cleavage. About 3 days after fertilization the embryo is a ball of ~8 cells. This stage is called a morula. Cleavage continues, forming a ball of cells ...
... The fertilized egg is called a zygote. Activation of the metabolic machinery of the zygote also begins a process of repeated cell division called cleavage. About 3 days after fertilization the embryo is a ball of ~8 cells. This stage is called a morula. Cleavage continues, forming a ball of cells ...
AP Bio Chapter 47 – Animal Development Review Guide
... Neural Crest - A band of cells running along the border where the neural tube pinches off from the ectoderm. The cells migrate to various parts of the embryo and form the pigment cells in the skin, bones of the skull, the teeth, the adrenal glands, and parts of the peripheral nervous system Somites ...
... Neural Crest - A band of cells running along the border where the neural tube pinches off from the ectoderm. The cells migrate to various parts of the embryo and form the pigment cells in the skin, bones of the skull, the teeth, the adrenal glands, and parts of the peripheral nervous system Somites ...
File
... into the interior of the embryo during gastrulation neural tube is a tube of cells running along the dorsal axis of the body, just dorsal to the notochord. It will give rise to the central nervous system neural crest is a band of cells along the border where the neural tube pinches off from the ecto ...
... into the interior of the embryo during gastrulation neural tube is a tube of cells running along the dorsal axis of the body, just dorsal to the notochord. It will give rise to the central nervous system neural crest is a band of cells along the border where the neural tube pinches off from the ecto ...
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.