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Development of Blood Vessels

Development of Blood Vessels

The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...

Mechanism of Angiogenesis

Mechanism of Angiogenesis

Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...

Regulation of Angiogenesis and Blood Supply

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

Overview of the Vascular System

Overview of the Vascular System

The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...

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Related Experiment Video

Updated: May 10, 2026

Whole-mount Immunohistochemical Analysis for Embryonic Limb Skin Vasculature: a Model System to Study Vascular Branching Morphogenesis in Embryo

Whole-mount Immunohistochemical Analysis for Embryonic Limb Skin Vasculature: a Model System to Study Vascular Branching Morphogenesis in Embryo

Published on: May 20, 2011

Understanding vascular development.

Ryan S Udan¹, James C Culver, Mary E Dickinson

¹Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, USA.

Wiley Interdisciplinary Reviews. Developmental Biology

|June 27, 2013

Summary

This summary is machine-generated.

The vascular system forms and adapts to nourish tissues throughout life. Understanding blood vessel development offers insights into treating diseases and promoting tissue repair.

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Area of Science:

Vascular Biology
Developmental Biology
Physiology

Background:

The organism's vasculature is a complex network essential for nourishing tissues and sustaining life.
Maintaining blood flow requires constant adaptation to physiological changes.
While studied for over a century, the regulation of vascular formation and its adaptation to cues is still being uncovered.

Purpose of the Study:

To provide an overview of vascular system development.
To highlight key areas of active investigation in vascular biology.
To identify critical unanswered questions in blood vessel development.

Main Methods:

Review of existing literature on vascular development.
Analysis of genetic, mechanical, and metabolic influences on vessel formation.
Exploration of adaptive mechanisms in adult vasculature.

Main Results:

Vascular development processes are crucial for adult tissue adaptation to stimuli like exercise, aging, and injury.
Insights into development inform therapies for vascular diseases, cancer, and tissue engineering.
Understanding developmental mechanisms impacts broader biological research.

Conclusions:

The study of blood vessel development provides critical insights into both fundamental biology and clinical applications.
Further research is needed to fully elucidate the complex regulatory networks governing vascular formation and adaptation.
Continued investigation into vascular development promises advancements in regenerative medicine and disease treatment.