MODERN EDUCATION AND DEVELOPMENT
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THE RENAL PORTAL VEIN AND ITS FUNCTIONS
Abdiyeva Azima Ilhom kizi
Afshona Public Health College named after Abu Ali Ibn Sina,
nursing science instructor
Xojiyeva Zilola azim kizi
Afshona Public Health College named after Abu Ali Ibn Sina,
nursing science instructor
Abstract: Although the renal portal system is more prominent in lower
vertebrates such as amphibians, reptiles, and birds, its concept remains relevant in
understanding evolutionary anatomy and comparative renal physiology. In humans,
the kidney does not have a classic renal portal vein, but the term is sometimes loosely
used to describe venous structures related to renal drainage. This paper explores the
anatomical and physiological aspects of the renal venous system, its clinical
importance, and the concept of the renal portal system in vertebrate evolution.
Introduction
The kidney plays a central role in maintaining homeostasis through the
filtration of blood, regulation of electrolytes, and excretion of metabolic waste. While
the term
renal portal vein
is not commonly used in human anatomy, the renal venous
system, particularly the
renal vein
, is critical for returning deoxygenated blood from
the kidneys to the inferior vena cava. In lower vertebrates, a
renal portal system
carries blood from the hind limbs to the kidneys for secondary filtration before it
reaches the heart.
Anatomy of the Renal Venous System
In humans, each kidney is drained by a
renal vein
, which emerges from the
renal hilum (also called the renal portal or gate of the kidney). The
left renal vein
is
longer than the right and passes anterior to the aorta to reach the inferior vena cava.
Tributaries of the renal vein include:
Suprarenal vein
MODERN EDUCATION AND DEVELOPMENT
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Gonadal vein
(testicular or ovarian)
Ureteric veins
Lumbrical veins
There is
no true portal venous system
in human kidneys; however, in species
such as frogs and reptiles, the renal portal system is a functional component of
circulation.
Functions of the Renal Venous System
1.
Blood Drainage
: The renal vein collects filtered, deoxygenated blood
from the kidney and delivers it to the inferior vena cava.
2.
Thermoregulation & Hormonal Transport
: Renal veins participate in
temperature regulation and transport of hormones such as erythropoietin.
3.
Venous Return from Associated Structures
: The renal vein receives
blood not only from the kidney but also from nearby organs like the adrenal gland and
gonads.
4.
Evolutionary Perspective
: In lower vertebrates, the renal portal vein
allows blood from the posterior div to pass through the kidney before systemic
circulation, playing a role in osmoregulation and nitrogen waste processing.
Clinical Significance
Renal Vein Thrombosis
: A condition in which the renal vein becomes
blocked, affecting kidney function.
Nutcracker Syndrome
: Compression of the left renal vein between the
aorta and the superior mesenteric artery can cause hematuria and flank pain.
Renal Transplantation
: Surgical reconnection of the renal vein is critical
for graft viability.
Conclusion
While humans do not possess a classical renal portal system, understanding the
renal venous architecture is essential in nephrology, surgery, and evolutionary biology.
The concept of the renal portal vein remains significant in comparative anatomy and
serves as a window into the physiological adaptations of the excretory system across
species.
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REFERENCES
1.
Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2018).
Clinically Oriented
Anatomy
. 8th ed. Wolters Kluwer.
2.
Standring, S. (2020).
Gray’s Anatomy: The Anatomical Basis of Clinical
Practice
. 42nd ed. Elsevier.
3.
Schmidt-Nielsen, K. (1997).
Animal Physiology: Adaptation and Environment
.
Cambridge University Press.
4.
Kumar, V., Abbas, A. K., & Aster, J. C. (2020).
Robbins and Cotran Pathologic
Basis of Disease
. 10th ed. Elsevier.
5.
Khoshdel, A. R., & MacLellan, D. G. (2019). "Renal Vein Thrombosis and Its
Clinical Implications."
Journal of Nephrology and Renal Therapy
, 5(2), 98–104.
6.
Feder, M. E., & Burggren, W. W. (1985). "Cutaneous Gas Exchange in
Vertebrates: Design, Patterns, Control and Implications."
Biological Reviews
, 60(1),
1–45.
