Flashcards in H&N 3.2 lymphatic system Deck (27):
what are the 3 main broad components of the lymphatic system?
give examples of tissues that dont have lymphatic drainage?
lens and cornea of eye, inner ear, cartilage
how does tissue fluid form?
In teh arterioles, hydrostatic pressure exceeds oncotic, so you get tissue fluid formation.
In the venules, the oncotic pressure is greater than the hydrostatic pressure, so the tissue fluid gets reabsorbed, however not all of it returns.
What substances are found in tissue fluid which enter lymphatic capillaries?
When does tissue fluid become lymph?
When it moves into lymphatic capillaries.
How much lymph do we produce per day?
What is the function of the lmyphatic system?
Continuous removal of remaining tissue fluid from extracellular space back into the blood.
What's the order of vessels of lymphatic flow?
afferent lymphatic vessel
efferent lymphatic vessel
What are some features of the quality of lymphatic flow?
where does lymph re-enter the blood circulation?
right side of the body above diaphragm- right lymphatic duct, into right subclavian vein.
Left side of the body and right side below diaphragm, thoracic duct into left subclavian vein
What is lymphoedema?
Abnormally accumulation of protein rich tissue fluid causing swelling due to a compromised lymphatic system.
What are some causes of lymphoedema
-removal of some lymph nodes
-damage to system eg due to chemotherapy
-lack of movement (muscle contraction helps to move the lymphatic fluid)
What's the structure of lymph nodes?
tough fibrous capsule surrounding reticular connective tissue
What do lymph nodes contain?
Many lymphocytes and macrophages
What's the function of lymph nodes?
-involved in immune response
-physical barrier to proteins, cells etc
-site of activation and proliferation of lymphocytes.
What is lymphadenopathy?
Swollen lymph node
What are some causes of lymphadenopathy?
What are the features of a swollen lymph node caused by infection?
What are the features of a swollen lymph node caused by malignancy?
How can lymph nodes be broadly classified?
regional (drain specific areas-superficial)
terminal (drain many regional lymph nodes-deep)
Where can you palpate lymph nodes?
Head and neck
How are the superficial and deep lymph nodes of the head and neck separated?
By the investing fascia.
What are the superficial groups of lymph nodes in the head and neck?
-anterior cervical lymph nodes
-posterior cervical lymph nodes
-superficial cervial lymph nodes
What makes up waldeyer's ring?
What's another word for pharyngela tonsils?
What's the most commonly enlarged deep cervical lymph node?