Lymphatic System Flashcards
What is the function of the lymphatic system? (2)
- Provides defense against pathogens.
- Recycles fluid and other nutrients, which are lost from the cardiovascular system, into the venous system for reuse..
The lymphatic system is composed of: (4)
- Lymph
- Lymphatic vessels (lymphatics)
- Lympoid tissues and organs
- Red bone marrow
Lymphatic vessels found in most areas of the body except: (4)
- CNS
- Splenic pulp
- Bone marrow
- Cornea
Function of Lymph node?
Filter lymph
Pale yellow fluid which is similar in composition to interstitial fluid.
Lymph
Transport Lymph.
Lymphatic vessels
Site of lymphocyte production.
Red bone marrow
Originate as Microscopic lymphatic capillaries in the space between cells are are found in most parts of the body.
Lymphatic vessels
Unite to form larger structures called lymphatic vessels.
Lymphatic capillaries
Are structurally adapted to ensure the return of proteins, which leak out of blood capillaries to the cardiovascular system.
Lymphatic capillaries
Have a unique structure that permits interstitial fluid to flow into them, but not out of them.
Lymphatic capillaries
Are lymphatic capillaries larger or smaller than blood capillaries?
Slightly larger.
End blindly, unlike blood capillaries which are continuous with arterioles and venules.
Lymphatic capillaries
Resemble veins in structure, but have a thinner wall and more valves than veins.
Lymphatic vessels
Contain lymph nodes at various intervals along their length.
Lymphatic vessels
Deliver lymph into two large vessels called lymphatic ducts.
Lymphatic vessels
Drain into subclavian veins
Lymphatic ducts
Sac like chamber at the inferior end o the thoracic duct.
Cisterna Chyli
Is a specialized form of loose connective tissue that contains lymphocytes.
Lymphoid tissue
Large masses of lympoid tissue that are not surrounded by a capsule.
Lymphoid nodules (lymphatic follicles)
Lympoid nodules that are scattered throughout the mucous membranes.
(MALT) Mucosa-associated lympoid tissue
Cluster of lympoid nodules in the lining of the small intestines.
Aggregated lympoid nodules (Peyer’s Patches)
Large lympoid nodules in the pharynx.
Tonsils
How many tonsils do we have?
5
Types of Tonsils?
- Palatine tonsils (left and right)
- Lingual tonsils (left and right)
- Pharyngeal tonsil (adenoid)
Formed by the 5 tonsils
Waldeyers ring
Are srrounded by a capsule that is composed of dense connective tissue.
Lymphoid organs
Small lymphoid organs located along lymphatic vessels.
Lymph Nodes
Outer cover of lymph node.
Capsule
Bundles of collagen fibers that extend from capsule to interior of the lymph node to divide the lymph node into compartments.
Trabeculae
Core of lymph node
Medulla
Shallow indentation where blood vessels and nerve attach to the lymph node.
Hilum (Hilus)
Carry lymph toward the lymph node.
Afferent lymphatic vessels
Carry lymph away from the lymph nodes.
Efferent lymphatic vessels
Located in mediastinum, pink in color, and has a cortex and medulla.
Thymus gland
Largest collection of lymphoid tissue. Filters blood.
Spleen
Located on left side towards back, behind stomach.
Spleen
Smooth surface that conforms to the shape of the diaphragm.
Diaphragmatic surface
Surface that conforms to the shape of the stomach.
Visceral surface
Area on the visceral surface where blood and lymphatic vessels connect to the spleen.
Hilum
Transport O2, nutrients, and wastes to and from spleen.
Splenic artery and vein
Has high quantities of RBCs in spleen.
Red pulp
Has high quantities of lymphocytes in spleen.
White pulp
