15.21 the concept of stem cells
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15.21 The concept of stem cells. Vertebrate blood development. There are two phases of hematopoiesis: 1) Embryonic (“primitive”) phase : transient; provides the embryo with its initial blood cells; associated with the blood islands in the mesoderm; dependent on BMP signaling. - PowerPoint PPT PresentationTRANSCRIPT
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15.21 The concept of stem cells
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Vertebrate blood development
• There are two phases of hematopoiesis:
1) Embryonic (“primitive”) phase: transient; provides the embryo with its initial blood cells; associated with the blood islands in the mesoderm; dependent on BMP signaling.
2) Subsequent definitive (“adult”) phase: generates more cell types, and provide the stem cells that will last for the lifetime of the individual (derived from the mesodermal area surrounding the aorta).
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15.22 Sources of blood cells to the adult bone marrow (Part 1)
AGM: aorta-gonad-mesonephros region
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15.22 Sources of blood cells to the adult bone marrow (Part 2)
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15.22 Sources of blood cells to the adult bone marrow (Part 3)
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15.23 A model for the origin of mammalian blood and lymphoid cells
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15.24 Formation of the human digestive system (Part 1)
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15.24 Formation of the human digestive system (Part 2)
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15.24 Formation of the human digestive system (Part 3)
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15.24 Formation of the human digestive system (Part 4)
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15.25 Formation of glandular primordia from the pharyngeal pouches (Part 1)
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15.25 Formation of glandular primordia from the pharyngeal pouches (Part 2)
• The respiratory tube sprouts from the pharyngeal floor (between the fourth pair of pharyngeal pouches) to form the lungs.
• The pharynx is where the endoderm meets the ectoderm, and the endoderm plays an important role in determining which pouches develop.
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15.26 Regional specification of the gut endoderm and splanchnic mesoderm through reciprocal interactions (Part 1)
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15.26 Regional specification of the gut endoderm and splanchnic mesoderm through reciprocal interactions (Part 2)
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15.26 Regional specification of the gut endoderm and splanchnic mesoderm through reciprocal interactions (Part 3)
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15.27 Pancreatic development in humans (Part 1)
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15.27 Pancreatic development in humans (Part 2)
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15.30 Partitioning of the foregut into the esophagus and respiratory diverticulum during the third and fourth weeks of human gestation
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15.32 The immune system relays a signal from the embryonic lung
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15.33 Schematic drawings of the extraembryonic membranes of the chick (Part 1 and 2)
Ectoderm + mesoderm = somatopleure: forms the amnion and chorion
Mesoderm + endoderm = Splanchnopleure: forms the yolk sac and allantois
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15.33 Schematic drawings of the extraembryonic membranes of the chick (Part 3)
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15.33 Schematic drawings of the extraembryonic membranes of the chick (Part 4)