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Anatomy & Physiology: The Lymphatic System
Transcript of Anatomy & Physiology: The Lymphatic System
internal jugular v.
internal jugular v.
Two semi-independent parts:
lymphatic vessels (similar to blood vessels)
lymphatic tissues and organs
return leaked fluid and patrol for pathogens
T - cells (mature in the thymus)
B - cells (mature in the bone marrow)
Principle lymphoid organ
Concentrated in the inguinal, cervical and axillary regions
Function to filter the lymph and activate the immune system
nodes are bean shaped and laced with trabeculae
many afferent vessels enter, few efferent vessels leave
(the heart has been removed)
Other Lymphoid Organs
largest lymphoid organ
curls around the stomach
site of WBC proliferation
immune surveillance of the blood
stores breakdown products of RBCs
fetal site of erythropoiesis
white pulp houses WBCs
red pulp houses RBCs
causes T lymphocytes to become immunocompetent
overlies the heart in infancy
increases in size and is most active in childhood
stops growing in adolescence and ultimately atrophies
Simplest lymphoid organs; form a ring of lymphatic tissue around the pharynx
1) Palatine tonsils – either side of the posterior end of the oral cavity
2) Lingual tonsils – lie at the base of the tongue
3) Pharyngeal tonsil – posterior wall of the nasopharynx
4) Tubal tonsils – surround the openings of the auditory tubes into the pharynx
Be sure you can:
caused by lymph blockage