Related Experiment Video
Updated: May 20, 2026

Three-dimensional Rendering and Analysis of Immunolabeled, Clarified Human Placental Villous Vascular Networks
Published on: March 29, 2018
Are there lymphatic vessels in the placenta?
C Bellini1, M Rutigliani, F Boccardo
1Neonatal Intensive Care Unit, University of Genoa, I.R.C.C.S. Gaslini Institute, Genoa, Italy. carlobellini@ospedale-gaslini.ge.it
The role of lymphatics in placentation has been scantily studied and the true existence of placental lymphatics is under debate. Numerous blood and lymphatic-lineage molecule markers are now available and they are expressed in human placental tissue. D2-40 expression at the placental stromal level seems to indicate that network-forming, podoplanin-expressing cells may act as a reticular-lymphatic-like conductive network. This exciting area at the intersection of perinatology and lymphology needs further investigation.
The role of lymphatics in placentation has been scantily studied and the true existence of placental lymphatics is under debate. Numerous blood and lymphatic-lineage molecule markers are now available and they are expressed in human placental tissue. D2-40 expression at the placental stromal level seems to indicate that network-forming, podoplanin-expressing cells may act as a reticular-lymphatic-like conductive network. This exciting area at the intersection of perinatology and lymphology needs further investigation.
Related Concept Videos
Fetal Circulation
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Development of the Lymphatic System
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...
Development of Blood Vessels
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...
Lymphatic Vessels and Lymph Transport
This one-way system allows fluids, solutes, and even pathogens to enter but prevents their return to the intercellular spaces.
Fluid Connective Tissues: Blood and Lymph
Blood
The blood flows through blood vessels— arteries, capillaries, and veins. Blood plasma is primarily made of proteins, solutes, and water.
Veins of the Abdomen and Pelvis
The inferior vena cava is fed by numerous smaller veins. The lumbar veins, for instance, drain the posterior abdominal wall, emptying both directly into the inferior vena cava and into the...

