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Development of Blood Vessels01:07

Development of Blood Vessels

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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.
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Anastomoses01:19

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In human anatomy, anastomosis refers to a connection or opening between two things, particularly between blood vessels or other tubular structures. The term is derived from the Greek term 'anastomosis,' which means 'outlet' or 'opening.' This natural network of connections plays a critical role in the survival and functionality of the human body.
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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...
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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...
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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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Esophageal varices are dilated, tortuous veins which are found mainly in the submucosa of the lower esophagus but which may also appear higher up or extend into the stomach. They develop due to increased pressure in the portal venous system, often as a result of liver cirrhosis. This condition scars and damages the liver, impeding normal blood flow through the portal vein. To compensate, blood seeks alternative pathways, forming fragile new vessels (varices) in the esophagus and stomach. These...
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Updated: Jun 24, 2025

A Patient-Derived Xenograft Model for Venous Malformation
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Vascular Malformations.

Neetu Bhari1, Akash Agarwal2, C V V Asritha3

  • 1Department of Dermatology, All India Institute of Medical Sciences, New Delhi, Delhi, India.

Indian Dermatology Online Journal
|June 7, 2024
PubMed
Summary
This summary is machine-generated.

Vascular malformations are complex circulatory system anomalies. Understanding their genetic causes, varied clinical signs, and advanced imaging is key to personalized treatment for better patient outcomes.

Keywords:
Arteriallymphaticvascular malformationsvenous

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Area of Science:

  • Vascular biology
  • Medical genetics
  • Radiology

Background:

  • Vascular malformations represent a spectrum of circulatory system anomalies with diverse clinical impacts.
  • Their complex nature presents significant diagnostic and therapeutic challenges for healthcare professionals.

Purpose of the Study:

  • To provide a comprehensive overview of vascular malformations.
  • To explore the genetic and molecular pathogenesis, clinical variability, diagnostic modalities, and therapeutic strategies.

Main Methods:

  • Review of current literature on vascular malformations.
  • Analysis of genetic and molecular mechanisms, clinical presentations, and imaging techniques (MRI, CT, angiography).
  • Evaluation of traditional and emerging therapeutic interventions.

Main Results:

  • Pathogenesis involves somatic mutations and dysregulated signaling pathways.
  • Clinical presentations range from cosmetic issues to life-threatening complications.
  • Advanced imaging is crucial for precise characterization, and treatment requires an individualized approach.

Conclusions:

  • Vascular malformations require a deep understanding of their multifaceted aspects.
  • An individualized treatment strategy is essential for optimizing patient care.
  • This review synthesizes current knowledge to guide clinicians and researchers, promoting improved patient outcomes and future research.