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[Ansiform growth of blood vessels as a fundamental principle of angiogenesis]
Insights
The greater omentum
Area of Science:
- Developmental biology
- Vascular biology
- Human embryology
Background:
- The greater omentum is a crucial abdominal organ with a complex vascular network.
- Understanding its vascular development (vasculogenesis) is essential for developmental biology and clinical applications.
Purpose of the Study:
- To investigate the sequential formation of the blood vascular system in the greater omentum during human development.
- To elucidate the principles of vasculogenesis in this organ from fetal stages to early childhood.
Main Methods:
- Histological examination of greater omentum tissue samples from human fetuses and children of varying ages (12 weeks gestation to 3 years).
- Analysis of vascular morphology and growth patterns using microscopy.
Main Results:
- Vasculogenesis in the greater omentum occurs via an 'ansiform' (loop-like) growth pattern of vessels.
- Vascular loops differentiate into arterial and venous components, with a growth bud at the apex driving proliferation.
- Capillary formation follows ansiform growth, initially forming connective capillaries and then a true capillary network.
Conclusions:
- The study proposes a two-stage model for greater omentum vasculogenesis: ansiform growth and capillary formation.
- This model highlights the distinct phases of vascular development, from initial loop formation to the establishment of a mature capillary network.
Abstract:
Succession in formation of blood bed of the greater omentum has been studied in human fetuses (42), in premature children with the body mass of 900-2,500 g (108) and in mature children up to 3 years of age (48). Vasculogenesis in the organ of 12-week-old fetuses and in older ones is demonstrated as an ansiform growth of the vessels. In the vascular loop the afferent geniculum contains differential signs of the arterial, and the different one--the venous part of the blood bed. The top of the loop contains a growth bud and is a zone of growth; it ensures proliferation of the vascular loops and their spreading in the growing tissue mass in the organ. This principle of growth provides a ramified system of arteries and veins, reiterating the course and branching of each other. Against the background of the ansiform growth of the vessels capillary formation begins, at first connective, and then true capillaries are formed. Basing on the data obtained a conception of vasculogenesis in ontogenesis is formulated. Its main stages are--period of ansiform growth of the vessels and period of capillary formation. In the latter should be distinguished appearance of connective capillaries and formation of truely capillary network.