Cell and Embryology Textbook: Wolpert L, Beddington R, Jessell T
... division of a yolk-rich egg, i.e. cleavage of the fertilized egg is restricted to the small disk of yolk-free yolk free cytoplasm and cannot penetrate through the dense yolk the yolk remains uncleaved holoblastic cleavage: the complete division of eggs having little yolk (as in sea urchins) or a m ...
... division of a yolk-rich egg, i.e. cleavage of the fertilized egg is restricted to the small disk of yolk-free yolk free cytoplasm and cannot penetrate through the dense yolk the yolk remains uncleaved holoblastic cleavage: the complete division of eggs having little yolk (as in sea urchins) or a m ...
Worksheet 5-Kingdom Animalia
... 15. Most animals reproduce ________ with the ___________ stage most prominent. 16. What is a coelom? 17. Draw a picture of a coelomate, acoelomate and pseduocoelomate. Explain the differences between the three body cavities and label your drawings. 18. Humans develop directly from the gastrula, in c ...
... 15. Most animals reproduce ________ with the ___________ stage most prominent. 16. What is a coelom? 17. Draw a picture of a coelomate, acoelomate and pseduocoelomate. Explain the differences between the three body cavities and label your drawings. 18. Humans develop directly from the gastrula, in c ...
Pregnancy PowerPoint
... • The zygote travels down the fallopian tube, it continues to divide, becoming a hollow ball of cells (blastocyst) by the time it reaches the uterus. • Prior to implantation, the blastocyst undergoes gastrulation. • Gastrulation and cell migration set up the three germ layers - endoderm, ectoderm, a ...
... • The zygote travels down the fallopian tube, it continues to divide, becoming a hollow ball of cells (blastocyst) by the time it reaches the uterus. • Prior to implantation, the blastocyst undergoes gastrulation. • Gastrulation and cell migration set up the three germ layers - endoderm, ectoderm, a ...
Shortened Campbell Development
... and messing with those determining factors • Determination is the term used to describe the process by which a cell or group of cells becomes committed to a particular fate • Differentiation refers to the resulting specialization in structure and function ...
... and messing with those determining factors • Determination is the term used to describe the process by which a cell or group of cells becomes committed to a particular fate • Differentiation refers to the resulting specialization in structure and function ...
Gastrulation
... respiratory passages. It also forms many glands, such as the liver and pancreas. The mesoderm forms the somites, the notochord, and the mesenchyme, which give rise to the muscles, circulatory and excretory systems of the body. ...
... respiratory passages. It also forms many glands, such as the liver and pancreas. The mesoderm forms the somites, the notochord, and the mesenchyme, which give rise to the muscles, circulatory and excretory systems of the body. ...
Document
... First division begins 24 hours after fertilization and takes 6 hours Each succeeding division takes less time Blastomeres – progressively smaller cells produced by cleavage Morula – solid sphere of cells ...
... First division begins 24 hours after fertilization and takes 6 hours Each succeeding division takes less time Blastomeres – progressively smaller cells produced by cleavage Morula – solid sphere of cells ...
First Week of Development
... syncytium, fuse and form large lacunae. Embryoblast – bilaminar germ disc : epiblast ( columnar ) and hypoblast ( cuboidal ) Formation of Exocoelomic ( Heuser’s ) membrane and exocoelomic cavity, or primitive yolk sac. ...
... syncytium, fuse and form large lacunae. Embryoblast – bilaminar germ disc : epiblast ( columnar ) and hypoblast ( cuboidal ) Formation of Exocoelomic ( Heuser’s ) membrane and exocoelomic cavity, or primitive yolk sac. ...
Germ layers - Green Local Schools
... Fluid-filled cavity forms in the morula → blastocyst › Two tissues Trophoblast Inner cell mass: forms the embryo ...
... Fluid-filled cavity forms in the morula → blastocyst › Two tissues Trophoblast Inner cell mass: forms the embryo ...
Chordata - De Anza College
... blastoderm. The cells of the blastoderm are arranged in two layers, the epiblast and hypoblast, that enclose a fluidfilled cavity, the blastocoel. ...
... blastoderm. The cells of the blastoderm are arranged in two layers, the epiblast and hypoblast, that enclose a fluidfilled cavity, the blastocoel. ...
4_Trilaminar_Embyo_(week3)
... Blood Vessels form in mesoderm from mesenchymal cells that become angioblasts Angioblasts aggregate to form blood islands Blood island cavities (contain lining of primitive endothelium) fuse into endothelial channels Surrounding mesoderm forms smooth muscle & CT of blood vessels Embryonic ...
... Blood Vessels form in mesoderm from mesenchymal cells that become angioblasts Angioblasts aggregate to form blood islands Blood island cavities (contain lining of primitive endothelium) fuse into endothelial channels Surrounding mesoderm forms smooth muscle & CT of blood vessels Embryonic ...
mesoderm
... ---primitive streak: ---primitive node (primitive knot) ---primitive pit (blastopore) ...
... ---primitive streak: ---primitive node (primitive knot) ---primitive pit (blastopore) ...
Introduction - Biology Courses Server
... ____________ to create two cells called __________________. These cells continue dividing via MITOSIS / MEIOSIS (circle one), eventually becoming a ____________ when it reaches 12 cells. A fluid-filled cavity forms, at which point the ball of cells is called a _________________. The outer cell mass ...
... ____________ to create two cells called __________________. These cells continue dividing via MITOSIS / MEIOSIS (circle one), eventually becoming a ____________ when it reaches 12 cells. A fluid-filled cavity forms, at which point the ball of cells is called a _________________. The outer cell mass ...
3_Bilaminar Embryo_(week2)
... Blastocoel (future primitive yolk sac or exocoelomic cavity) Exocoelomic membrane from migrated hypoblast (aka Heuser’s membrane) Cytotrophoblast (trophoblast derivative) Syncytotrophoblast (trohphoblast derivative) Endometrium - proximal (maternal tissue) Lumen of Uterus (Maternal organ) Si ...
... Blastocoel (future primitive yolk sac or exocoelomic cavity) Exocoelomic membrane from migrated hypoblast (aka Heuser’s membrane) Cytotrophoblast (trophoblast derivative) Syncytotrophoblast (trohphoblast derivative) Endometrium - proximal (maternal tissue) Lumen of Uterus (Maternal organ) Si ...
Embryonic Development
... Expulsion is the second stage Period from full dilation of the cervix to delivery of the infant ...
... Expulsion is the second stage Period from full dilation of the cervix to delivery of the infant ...
Lesson 6 Lesson Outline: Developmental Origins of
... arises from mesoderm but it can also be ectodermal in origin. While most mesenchyme is ...
... arises from mesoderm but it can also be ectodermal in origin. While most mesenchyme is ...
Lesson 5 - Zoology, UBC
... arises from mesoderm but it can also be ectodermal in origin. While most mesenchyme is ...
... arises from mesoderm but it can also be ectodermal in origin. While most mesenchyme is ...
Intro to Animals
... Eggs released to water, eggs held internally, development internal or external, typically direct development ...
... Eggs released to water, eggs held internally, development internal or external, typically direct development ...
Implantation
... result in increase in cells, blastomere, which become smaller with each division ...
... result in increase in cells, blastomere, which become smaller with each division ...
Notes from Ch. 24
... exoskeleton – hard, waxy covering on outside of the body that provides a framework for support Vertebrates-animals w/a backbone endoskeleton – support framework housed within the body Animal Cells vs Plant Cells- plant cells have a cell wall making them rigid – animal cells do not have a cell wall H ...
... exoskeleton – hard, waxy covering on outside of the body that provides a framework for support Vertebrates-animals w/a backbone endoskeleton – support framework housed within the body Animal Cells vs Plant Cells- plant cells have a cell wall making them rigid – animal cells do not have a cell wall H ...
File
... corpus luteum would normally degenerate so, estrogen and progesterone continue to “maintain pregnancy” • high hCG production for 2 months, then it drops off but not completely until birth • Placenta eventually takes over to produce estrog. & progest. ...
... corpus luteum would normally degenerate so, estrogen and progesterone continue to “maintain pregnancy” • high hCG production for 2 months, then it drops off but not completely until birth • Placenta eventually takes over to produce estrog. & progest. ...
1_Early Embryology - Temple University Sites
... The spaces in the extraembryonic mesoderm soon coalesce to form the extraembryonic coelom. This cavity is surrounded by extraembryonic somatopleuric and splanchnopleuric mesoderm. The one exception is where the bilaminar disc is attached to the placenta which is called the connecting stalk. ...
... The spaces in the extraembryonic mesoderm soon coalesce to form the extraembryonic coelom. This cavity is surrounded by extraembryonic somatopleuric and splanchnopleuric mesoderm. The one exception is where the bilaminar disc is attached to the placenta which is called the connecting stalk. ...
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.