Lymphatic Vessels and Lymph Circulation Flashcards
slightly larger in diameter than blood capillaries
lymphatic capillaries
slightly larger in diameter than blood capillaries, the endothelial cells overlap and form one-way flaplike mini-valves that allow fluid into capillaries but not out
lymphatic capillaries
in what direction do lymphatic capillaries allow fluid?
into the capillaries but not out
collagen fibers that attach the lymphatic capillaries to surrounding tissues. When there is excess interstitial fluid, the filaments are pulled taut and open up the spaces between lymphatic capillary endothelial cells (valves) even more.
anchoring filaments
what are anchoring filaments made of?
collagen fibers
what attaches lymphatic capillaries to surrounding tissues
anchoring filaments
What happens to the anchoring filaments when there is interstitial fluid?
the filaments are pulled taut and open up the spaces between lymphatic capillary endothelial cells (valves) even more
Special lymphatic capillaries found in the small intestine that pick up lipids and lipid soluble vitamins. The lymph has a milky appearance due to the presence of lipids and is referred to as chyle.
lacteals
Where are lacteals found?
small intestine
What do lacteals pick up?
lipids and lipid soluble vitamines
What is the appearance and why and what is it called in the lymph of lacteals?
the lymph has milky appearance due to the presence of lipids and is referred to as chyle
similar to veins except they are even thinner walled and have more valves, they merge to form larger vessels (lymphatic trunks)
collecting lymphatic vessels
What do collecting lymphatic vessels merge to form?
larger vessels (lymphatic trunks)
What are the 5 main lymphatic trunks?
lumbar intestinal bronchomediastinal subclavian jugular
What lymphatic trunk drains the thorax?
bronchomediastinal
From the lymphatic trunk where does the lymph flow?
into one of two ducts (thoracic or right lymphatic duct)
This starts at the cisterns chyli, drains both the left and right sides of the body inferior to the ribs and the left head, neck, thorax, and the arm. Lymph from here drains into the left subclavian vein.
thoracic (aka left lymphatic) duct
Where does the thoracic (left lymphatic) duct start?
cisterna chyli
What 6 areas does the thoracic (left lymphatic) duct drain?
left and right sides of body inferior to the ribs left head neck thorax arm
Into what vein does the lymph from the thoracic (aka left lymphatic) duct drain?
left subclavian vein
This is a pouch at the beginning of the thoracic duct that drains the left and right lumbar trunks, and the intestinal trunk.
cisterna chyli
What 3 areas does the cisterna chyli drain?
left and right lumbar trunks
intestinal trunk
This drains the right thorax, right arm, right side of neck, right side of head, and part of the liver. Lymph returns to the cardiovascular system via the right subclavian vein.
right lymphatic duct
What 5 areas does the right lymphatic duct drain?
right thorax right arm right side of neck right side of head part of liver
Where does the lymph of the right lymphatic duct return too?
the cardiovascular system via the right subclavian vein
