Lymphatic capillaries and other vessels


Lymphatic capillaries and other vessels


     The structure of lymphatic capillaries is like blood capillaries to some extent. These are made of single layer of endothelium capillaries like blood capillaries but their walls are much transparent and because of this reason they absorb the components of interstitial fluid and leucocytes come out through the walls. Lymphatic capillaries are extended like a net in the middle of tissue cells. A transparent fluid like water supplies in it all the time. These start from the interstitial spaces of all the organs in the form of small pipes of closed mouth. These are some broader comparison to blood capillaries. There is an absence of lymphatic capillaries in the central nervous system and cornea.   

     There are special kinds of lymphatic capillaries in the villi situated on the internal surface of small intestine which are called lacteals. Lacteals absorb fat from the small intestine and supply it into the blood for distributing it into the whole body. Lacteals are white because of the presence of fat in the lymph which is called chyle.

     Many lymphatic capillaries make big collecting vessels by meeting altogether which are called lymphatics. These look like veins but their walls are thinner comparison to the walls of veins. Like veins, there are more valves in it comparatively which stop lymph from going at the back side. Lymphatics are found often in the connecting tissues perpendicular to blood vessels. These lymphatic are arranged into two sets-superficial and deep inside the body and they pass through the different nods. Superficial lymphatics vessels in the skin tissue and skinless tissue run with the superficial veins whereas deep veins run along with veins and capillaries.

     By meeting to each other, Lymphatics make two big ducts- right lymphatic duct and thoracic duct. Both these ducts relieve their lmph into the subclavion veins just above the heart.