Anatomy and Cell Biology 2221 Lecture 8: Lecture 8
9 Dec 2016
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Drains excess interstitial fluid: collects fluid from between tissues/cells and returns it to the blood. Transports dietary lipids: transports lipids (fats) and lipid-soluble vitamins (a, d, e, k) from the intestines to the blood. Carries out immune responses: initiates responses directed against pathogens. Vessels unite to form lymph trunks: lumbar (lower limbs, pelvis, intestinal (abdomen, bronchomediastinal (thorax, lungs, heart, subclavian (upper limb) Trunks drain into two main ducts: thoracic (left lymphatic) duct, right lymphatic duct. Returns lymph to venous circulation have valves to ensure proper direction of flow. Junction of r internal jugular and subclavian veins: short duct (1. 2 cm); drains upper-right side of body head and upper limb. Junction of l internal jugular and subclavian veins: long (35-45 cm); begins in lower thorax. Primary lymphatic organs: derived cells become immunocompetent (capable of mounting an immune response, red bone marrow, thymus, cells include wbc (t cells; b cells) Secondary lymphatic organs: site where most immune responses occur.
