2011 vascular system Lecture three

2011 vascular system Lecture three - The Circulatory System...

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The Circulatory System III: -Embryology -Evolution -Anatomy
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Vasculogenesis = the early embryonic development and differentiation of blood vessels.
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Fertilization of Egg Zygote Morula Blastula 0.1 mm Embryo Development Morula to Blastula Zygote to Morula
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Endoderm, Mesoderm and Ectoderm form during gastrulation. They are the forerunners of all adult tissues of all higher animals. Blastula to Gastrula Gastrulation is a crucial time in the development of multicellular animals
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Mesenchyme Yolk Sac
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The Mesenchyme differentiates into hematopoietic (blood- forming) and connective tissues.
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The Yolk Sac forms the first blood cells and primitive blood vessels (vitelline circuit) in the embryo before internal embryonal circulation begins. Human embryo, 2.6 mm
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Vitelline Blood Circuit ¾ Blood islands differentiate into blood cells and vessel walls. ¾ Primitive vitelline blood vessels form. ¾ A single tubular heart forms and begins to beat. L: 1.3 mm
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The vitelline circuit is the only extraembryonal blood circuit in non-placental mammals and other vertebrates. Chicken, 4 d Coho Salmon Alevin
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Embryonic Development in Fish
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1. The Vitelline Circuit (yolk sac circuit; vitellus=yolk) ¾ Provides nutrients from the yolk (vitelline veins) . ¾ Vitelline arteries supply the yolk sac with oxygen. There are 2 Extraembryonic Circuits in Placental Mammals
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2. The Umbilical or Placental Circuit ¾ Placenta provides oxygen and nutrients to the embryo (umbilical veins). ¾ Deoxygenated blood is drained via umbilical arteries to the placenta. Extraembryonic Circuits
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The Internal Embryonic Circuit ¾ Heart tube connects to dorsal aorta via six paired aortic arches that supply blood to tissues.
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2011 vascular system Lecture three - The Circulatory System...

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