Gastrulation: Formation of the Primary Germ Layers
... The way in which the bottle cells change shape and become motile is detailed in the next lecture on neurulation Mammalian Pattern & Polarity Humans, like most other living things, have a distinct organization. Thus the head is at one end while the feet are at the opposite end (Anterior-Posterior A ...
... The way in which the bottle cells change shape and become motile is detailed in the next lecture on neurulation Mammalian Pattern & Polarity Humans, like most other living things, have a distinct organization. Thus the head is at one end while the feet are at the opposite end (Anterior-Posterior A ...
circumference of the egg and is, at first, quite broad. It is
... rise to the nervous system and organs of special sense (eyes, ears, nose). The adhesive glands or "suckers" are also formecl by this layer; and the anterior and posterior divisions of the ...
... rise to the nervous system and organs of special sense (eyes, ears, nose). The adhesive glands or "suckers" are also formecl by this layer; and the anterior and posterior divisions of the ...
page1/page15/files/Chapter 32 Presentation
... sperm fertilizes a non-motile egg forming a diploid zygote. ...
... sperm fertilizes a non-motile egg forming a diploid zygote. ...
Chapter 32: Animal Diversity
... and ending with the gastrula? You should show these processes and their resulting products: fertilization, cleavage, blastulation, and gastrulation. Sperm fertilizes egg to form the zygote; zygote undergoes cleavage to form the 8-cell stage; 8-cell stage undergoes blastulation to form the blastula; ...
... and ending with the gastrula? You should show these processes and their resulting products: fertilization, cleavage, blastulation, and gastrulation. Sperm fertilizes egg to form the zygote; zygote undergoes cleavage to form the 8-cell stage; 8-cell stage undergoes blastulation to form the blastula; ...
myogenesis
... (muscle-producing) cells • Each myotome splits into two structures: a dorsal epimere and a ventral hypomere • The epimeres give rise to the deep epaxial muscles of the back, including the erector spinae and transversospinalis groups. ...
... (muscle-producing) cells • Each myotome splits into two structures: a dorsal epimere and a ventral hypomere • The epimeres give rise to the deep epaxial muscles of the back, including the erector spinae and transversospinalis groups. ...
Slide 1
... begin to give rise to another cell type characterized by a large round nucleus with pale nucleoplasm and a dark-staining nucleolus. These are the primitive nerve cells, or neuroblasts. They form the mantle layer, a zone around the neuroepithelial layer . The mantle layer later forms the gray matter ...
... begin to give rise to another cell type characterized by a large round nucleus with pale nucleoplasm and a dark-staining nucleolus. These are the primitive nerve cells, or neuroblasts. They form the mantle layer, a zone around the neuroepithelial layer . The mantle layer later forms the gray matter ...
lecture presentations
... Morphogenesis in animals involves specific changes in cell shape, position, and survival • after cleavage, the rate of cell division slows and the normal cell cycle is restored • Morphogenesis = the process by which cells occupy their appropriate locations and the embryo takes on its shape – occurs ...
... Morphogenesis in animals involves specific changes in cell shape, position, and survival • after cleavage, the rate of cell division slows and the normal cell cycle is restored • Morphogenesis = the process by which cells occupy their appropriate locations and the embryo takes on its shape – occurs ...
Document
... foregut in the fourth week of development. During the following weeks, its appearance and position change greatly as a result of the different rates of growth in various regions of its wall and the changes in position of surrounding organs. Positional changes of the stomach are most easily explained ...
... foregut in the fourth week of development. During the following weeks, its appearance and position change greatly as a result of the different rates of growth in various regions of its wall and the changes in position of surrounding organs. Positional changes of the stomach are most easily explained ...
Embryology Notes
... • Decision determined that a woman can choose to have an abortion for any reason up until the fetus is viable to live outside of the body without maternal support • Interesting note: Roe actually had the baby and gave it up for adoption • Advantages/benefits of abortion • Some believe that abortion ...
... • Decision determined that a woman can choose to have an abortion for any reason up until the fetus is viable to live outside of the body without maternal support • Interesting note: Roe actually had the baby and gave it up for adoption • Advantages/benefits of abortion • Some believe that abortion ...
Implantation
... The blastocyst adheres to the endometrium & a variety of proteolytic enzymes may play a role in separating the endometrial cells and digesting the intercellular matrix. The wall of the blastocyst facing the uterine lumen consist of a single layer of flattened cells. The thicker opposite wall has tw ...
... The blastocyst adheres to the endometrium & a variety of proteolytic enzymes may play a role in separating the endometrial cells and digesting the intercellular matrix. The wall of the blastocyst facing the uterine lumen consist of a single layer of flattened cells. The thicker opposite wall has tw ...
Molecular Basis of Development and Molecular Embryology
... patterning has explained the molecular basis of some human limb malformations. •We are studying how progenitor cells in the limb are guided differently to form cartilage and bone tissue in order to improve methods of regenerating bone and cartilage tissue for ...
... patterning has explained the molecular basis of some human limb malformations. •We are studying how progenitor cells in the limb are guided differently to form cartilage and bone tissue in order to improve methods of regenerating bone and cartilage tissue for ...
Formation of the extra
... • The placenta is formed by intimate contact between the chorion and the endometrium. In ruminant species, the placenta is described as ‘cotyledonary’ since placental attachment occurs only in the discrete areas of the endometrial caruncles. • Exchange of oxygen, carbon dioxide and nutrients between ...
... • The placenta is formed by intimate contact between the chorion and the endometrium. In ruminant species, the placenta is described as ‘cotyledonary’ since placental attachment occurs only in the discrete areas of the endometrial caruncles. • Exchange of oxygen, carbon dioxide and nutrients between ...
Chapter 16- Tetrapod limb development
... What dictates thumb-pinky orientation?? 1. A group of cell located near ____________ region of limb bud- called __________________________ (ZPA) directs polarity 2. These cells in the ZPA express __________________ (Shh) Evidence If place Shh bead in anterior limb bud… ...
... What dictates thumb-pinky orientation?? 1. A group of cell located near ____________ region of limb bud- called __________________________ (ZPA) directs polarity 2. These cells in the ZPA express __________________ (Shh) Evidence If place Shh bead in anterior limb bud… ...
The Digestive Tract of the Cod Eleutheroembryo ("Yolk
... The eleutheroembryo is a free-living (eleutheros=free) embryo, which still depends mainly on its yolk-sac for food. This phase lasts from hatching, when the embryo is about 3– 5 mm long, to the start of exogenous feeding at about 5 or 6 days. No mouth is present at hatching, but the oropharyngeal me ...
... The eleutheroembryo is a free-living (eleutheros=free) embryo, which still depends mainly on its yolk-sac for food. This phase lasts from hatching, when the embryo is about 3– 5 mm long, to the start of exogenous feeding at about 5 or 6 days. No mouth is present at hatching, but the oropharyngeal me ...
Platyhelminthes (Flat worms)
... a. Now we talk about Bilateria - animals with bilateral symmetry b. Platyhelminths have no coelom 1. Acoelomate c. Triploblasic - three germ layers 1. As embryo develops there are three clear layers a. Ectoderm - forms epithelium and nervous system b. Mesoderm - forms internal organs (muscles, repro ...
... a. Now we talk about Bilateria - animals with bilateral symmetry b. Platyhelminths have no coelom 1. Acoelomate c. Triploblasic - three germ layers 1. As embryo develops there are three clear layers a. Ectoderm - forms epithelium and nervous system b. Mesoderm - forms internal organs (muscles, repro ...
An introduction to animal diversity
... Most reproduce sexually, with a flagellated sperm and a large egg uniting to form a diploid zygote. The diploid stage dominates the life cycle. ...
... Most reproduce sexually, with a flagellated sperm and a large egg uniting to form a diploid zygote. The diploid stage dominates the life cycle. ...
Animal development PDF
... • Cell division is slowed by yolk • Holoblastic cleavage, complete division of the egg, occurs in species whose eggs have little or moderate amounts of yolk, such as sea urchins, frogs and mammals ...
... • Cell division is slowed by yolk • Holoblastic cleavage, complete division of the egg, occurs in species whose eggs have little or moderate amounts of yolk, such as sea urchins, frogs and mammals ...
Implantation
... irradiation that alters fetal morphology or fetal function if the fetus is exposed during a critical stage of development. 1. The resistant period (week 1 of development) the “all-ornone” phenomenon (i.e., the conceptus will either die as a result of the teratogen or survive unaffected). 2. The ma ...
... irradiation that alters fetal morphology or fetal function if the fetus is exposed during a critical stage of development. 1. The resistant period (week 1 of development) the “all-ornone” phenomenon (i.e., the conceptus will either die as a result of the teratogen or survive unaffected). 2. The ma ...
Chapter 8: Embryonic Induction
... determination. After determination has occurred in a tissue that tissue is said to be determined. It now has a more narrow prospective potency. Instead of a single instructive event precipitating the formation of the lens from the head ectoderm, recent work examining the induction of the amphibian l ...
... determination. After determination has occurred in a tissue that tissue is said to be determined. It now has a more narrow prospective potency. Instead of a single instructive event precipitating the formation of the lens from the head ectoderm, recent work examining the induction of the amphibian l ...
Drosophila embryogenesis
Drosophila embryogenesis, the process by which Drosophila (fruit fly) embryos form, is a favorite model system for geneticists and developmental biologists studying embryogenesis. The small size, short generation time, and large brood size make it ideal for genetic studies. Transparent embryos facilitate developmental studies. Drosophila melanogaster was introduced into the field of genetic experiments by Thomas Hunt Morgan in 1909.