Lecture 12: Lymphoid System Flashcards
What are three functions of lymphoid system?
- Protect against infection
- collect certain fluids and return them to circulation system
- Absorb fat from small intestines
Name two lymphoid organs?
Spleen, thymus
How many litres of fluid does the lymphatic system return into the blood stream each day?
3.5-4
Lymphatic vessels transport lymph from everywhere in your body EXCEPT ?
CNS and bones
Does the lymphatic system have a pump? If not how does it circulate?
Valves, propelled by respiration, skeletal muscle contraction, pulsation of nearby arteries, intrinsic smooth muscle contractions
Lymphatic a are absent from what parts of the body?
Eye Internal ear Bone marrow Cartilage Teeth CNS
Lacteals are specialised lymph capillaries present in what specific structures?
Intestinal mucosa
Lacteals absorb digested fat and deliver it where?
To the blood
Lymphatic a surround capillary beds and absorb the interstitial fluid that leaks of out?
Blood vessels
The right lymphatic duct drains what structures?
Right upper arm and right side of head and thorax
The thoracic duct arises where and drains what structures?
Arises from cisterns chyli and drains the rest of the body
How does lymph end up back into the circulatory system?
Right and left subclavian veins
The supraclavicular lymph nodes drain to?
Jugular lymphatic trunk=> left thoracic duct or right lymphatic duct
75% of lymph drains laterally and superiorly to what node?
Axillary Most of remainder drains medially and deep into the parasternal nodes. • Small amount may drain to the posterior intercostal nodes.
Cubital nodes surround what vessel
Median cubital vein
