6. The Lymphatic System Flashcards
What embryological sructure gives rise to the lymphatic vessels, lymph nodes, spleen, and myeloid tissue?
Mesoderm
What embryological structure gives rise to the thymus and parts of the tonsils?
Endoderm
What four tissues do not have lymphatic vessels?
Epidermis
Endomysium
Cartilage
Bone Marrow
What muscular unit propels lymph through the lymphatic vessels?
Lymphangions
What cells are found in the deep cortex of a lymph node?
T cells
Where is Virchow’s node?
What might it signify?
L upper clavicular space
Inter-thoracic / abdominal malignancy
Where are the epitrochlear nodes?
What can they signify?
Above the trochlea of the humerus
Secondary syphilis
What is drained by the thoracic duct?
Everything below the umbilicus
Everything left of the mid-saggital line
What is the cisterna chyli?
A distal dilation of the thoracic duct at L1-2, receiving lymph from the lumbar lymphatics
Is also the origin of the thoracic duct
Where does the thoracic duct terminate?
Into the L subclavian and internal jugular veins.
Where does the right lymphatic duct originate and terminate?
Origin: Junction of the right jugular and right subclavian trunks.
Termination: Empties at the juction of the right subclavian and right internal jugular veins.
What is the effect of the sympathetic nervous system on the lymphatic system?
Decreased lymphatic peristalsis, and tighter lymphatic valves
What is responible for movement of spleninc fluid through the spleen?
Movement of the thoracic diaphragm
