As lymph flows through the node, lymphocytes (white blood cells) are
added, this leaves the lymph cleaner due to breaking down bacteria.
Lymph drains through around 8 – 10 nodes before returning to the
blood. Most lymph nodes are solitary but some can be found in clusters.
For example, a cluster is found in the ileum of the small intestine. These
large masses of lymph nodules are known as Peyer’s patches.

Lymph Vessels – carry lymph
These are microscopic, thin walled tubes which branch, interconnect
and extend into almost all tissues of the body. They look like blood
capillaries but they contain a larger inner space and also have a closed
end. Lymph capillary walls are made up of overlapping cells that swing
slightly inward when fluid outside the capillary pushes against them.
This allows the milky fluid to enter the capillary, and is now referred to
as lymph. Small amounts of diffuse lymphatic tissue are found in
virtually every organ of the body.

Lymph capillaries join to form larger vessels called lymphatic’s or
sometimes called lymph veins. Lymphatic’s are found in the
subcutaneous tissue of the skin, following the same path as veins.
Lymph vessels contain valves to prevent the back flow of lymph and
they allow lymph to travel through lymphatic nodes.

Lymphatic Ducts – collects lymph
Thoracic duct is the principal vessel of the lymphatic system and carries
lymph as well as a substance called chyle, which is a milk fluid that
contains lymph and emulsified fats. It begins in the abdomen and runs
to the neck where it empties into the venous blood stream at the left
subclavian vein. This duct receives the lymph from smaller vessels of the
lower limbs and the upper left side of the head and neck.
Right lymphatic duct is a vessel that collects lymph from the right upper
side of the body and drains it into the right subclavian vein
Cisterna Chyli vessels drains lymph from the intestines which is laden
with digested fats.