Lymphatic Tissues and Organs February 15, 2010
Dec 19, 2015
Lymphatic System
Lymphatic vessels:Removes extracellular fluid (lymph) from the lamina propria.Absorb fat and transport as chyle. Transport lymphocytes and other cells, such as tumor cells.
Lymphatic tissues:Diffuse lymphatic tissues and cells
Solitary nodulesAggregates of nodules (Peyer’s patches) Tonsils Lymph nodes (filters lymph) Spleen (filters blood) Thymus (T cell differentiation) Bone marrow (source of lymphocytes)
Ross and Pawlina, p.397
#26 Lymph Nodealso #142
Subcapsular sinus
Trabecular sinus
Medullary sinuses
Hilus
Efferent lymphatic ducts
Blood vessels
Secondary follicles
Medullary cords
Direction of lymph flow through a
lymph node
Afferent lymphatic vessel
Subcapsular sinus
Trabecular or perinodular sinus
Medullary sinus
Efferent lymphatic vessel
Thoracic duct
Left subclavian vein
General circulation
Ross and Pawlina, p. 419
To lymph nodes
(Left side)
Another lymph node….
#26 Lymph Node: Medullary cords and sinuses (also #142)
M. Cord: lymphocytes plasma cells
M. sinus reticular cells lymphocytes macrophages
Palatine tonsil: covered with stratified squamous epithelium which invaginates to line the surface of the crypts
Ross and Pawlina, p. 415
Splenic Circulation
Splenic artery Splenic vein
PALS: Periarterial (periarteriolar) lymphatic sheath
Ross, et al. 13-31