Transcript Developmental Biology 8/e - Florida International University

15.1 Mesodermal development in frog and chick embryos (Part 1)
15.1 Mesodermal development in frog and chick embryos (Part 2)
15.2 Heart-forming cells of the chick embryo (Part 1)
The presumptive heart cells originate in the early primitive streak, just
posterior to Hensen’s node and extending about halfway down its length.
15.2 Heart-forming cells of the chick embryo (Part 2)
To inhibit Wnt
15.2 Heart-forming cells of the chick embryo (Part 3)
15.3 Formation of the chick heart from the splanchnic lateral plate mesoderm (Part 1)
15.3 Formation of the chick heart from the splanchnic lateral plate mesoderm (Part 2)
15.4 Migration of heart primordial (Part 1)
15.4 Migration of heart primordial (Part 2)
E12.5 WT
E12.5 Foxp4 mutant
15.5 Double in situ hybridization for the expression of RADH2 and Tbx5 (Part 1)
Orange: RADH2 (enconding the RA-synthesizing enzyme retinaldehyde
dehydrogenase-2)
Blue/Purple: Tbx5 (a marker for the early heart fields)
15.6 Cascade of heart development
- As cells migrate toward each other, the ventral mesoderm cells of the
primordia begin to express N-cadherin and join together to form an
epithelium.
- This joining will lead to the formation of the pericardium.
- A small population of these cells downregulate N-cadherin and
delaminate from the epithelium to form the endocardium (lining of the
heart that is continuous with the blood vessels).
- The endocardial cells produce many of the heart valves, secrete the
proteins that regulate myocardial growth, and regulate the placement
of nervous tissue in the heart.
- The epithelial cells form the myocardium that gives rise to the heart
muscles.
15.7 Cardiac looping and chamber formation (Part 1)
15.7 Cardiac looping and chamber formation (Part 2)
B and C: Xin expression (essential for heart looping) in chicken embryos.
D and E: Specification of atria and ventricles occurs before heart looping
(different types of myosins)
15.8 Formation of the chambers and valves of the heart
15.12 The aortic arches of the human embryo (Part 1)
15.12 The aortic arches of the human embryo (Part 2)
15.13 Vasculogenesis and angiogenesis (Part 1)
15.14 Vasculogenesis (Part 1)
The inner cells of the blood islands (aggregates of cells from the
splanchnic region) become blood progenitors, while the outer cells
become angioblasts (progenitor of blood vessels).
The angioblasts multiply and differentiate into endothelial cells which will
form the lining of the blood vessels.
The endothelial cells form tubes and connect to form the primary capillary
plexus.
15.14 Vasculogenesis (Part 2)
15.15 Yolk sacs of a wild-type mouse and a littermate heterozygous for a loss-offunction mutation of VEGF
15.13 Vasculogenesis and angiogenesis (Part 2)
15.16 Model of the roles of ephrin and Eph receptors during angiogenesis (Part 1)
15.16 Model of the roles of ephrin and Eph receptors during angiogenesis (Part 2)
15.17 Blood vessel specification in the zebrafish embryo (Part 1)
15.18 Model for blood vessel formation in the chick blastoderm
VEFG gradient (green) induce endothelial cells to become arteries (red), and
these arteries induce veins (blue) to form.
15.19 Arteries are specifically aligned with peripheral nerves in mouse limb skin