test 5 Flashcards
The lymphatic system is
part of the immune system that consists of vessels, nodes, ducts, and tonsils
lymphatic system function
helps fight disease processes and serves other functions in the body
lymphatic vessels are
a system of channels that parallel the venous blood vessels yet are more numerous
Tissue fluid drains from the surrounding region into the lymphatic vessels as
lymph
lymph nodes are
bean-shaped bodies grouped in clusters along the connecting lymphatic vessels
lymph nodes are positioned?
beside the lymphatic vessels
what do lymph nodes do ?
filter toxic products from the lymph to prevent their entry into the vascular system
lymph nodes located
superficially located with superficial veins or located deep within the tissue with the deeper blood vessels
lymphatic system is part of the immune system that includes
thymus and spleen
in healthy patients how do lymph nodes feel
small, soft, and mobile
can lymph nodes in healthy patients be seen or felt
no
The lymph flows into the lymph node by way of
afferent vessels
On one side of the node is a depression or
hilus
lymph flows out of the node by way of a single
efferent vessel
Lymph from a particular region first drains into
a primary node (regional node or master node)
primary nodes than drain into
secondary node (central node)
In the outer tissue of the body, smaller lymphatic vessels containing lymph converge into
larger lymphatic ducts
larger lymphatic ducts empty into
venous system of the blood in the thorax (chest area)
The lymphatic system of the right side of the head and neck converges by way of the right jugular trunk joining
the lymphatic system from the right arm and thorax (chest) to form the right lymphatic duct
right lymphatic duct drains into
venous component at the junction of the right subclavian and right internal jugular veins
The lymphatic vessels of the left side of the head and neck converge into the left jugular trunk, actually a short vessel, and then into
the thoracic duct
the thoracic duct joins
the venous component at the junction of the left subclavian and left internal jugular veins
The lymphatic system from the left arm and thorax also joins
the thoracic duct
The thoracic duct is much larger than
the right lymphatic duct because it drains the lymph from the entire lower half of the body(both the right and left sides)
The resultant increase in size and change in consistency of the lymphoid tissue is considered
lymphadenopathy
In some cases of infection, the lymph node can undergo inflammation or
lymphadenitis
lymphadenitis occurs with microbial infections such as
Staphylococcus aureus and Streptococcus pyogenes infections locally with tonsillar or oral abscesses as well as systemically with mononucleosis or HIV infections
Infectious mononucleosis is caused by
Epstein-Barr virus (EBV)
infectious mononucleosis in teenagers and young adults frequently there is
pharyngitis and inflamed palatine tonsils with exudate
The lymph nodes associated with the head and neck can also be involved in the spread of infection such as
dental or odontogenic infection from the teeth
This spread of infection occurs along the
connecting lymphatic vessels of the involved nodes.
cancer can also start within the nose as with
lymphoma, which includes both Hodgkin and non-Hodgkin disease. Lymph nodes can be also involved in the spread of certain cancers (carcinomas) from epithelial tissue in the region they filter
The spread of a cancer from the original or primary site of the neoplasm to another or secondary site is considered
metastasis
Primary nodes of the primary site then drain to the secondary site to which the cancer will later
metastasize
when lymph nodes are involved with cancer they become
bony hard, and possible fixed to surrounding tissue, structure, organs making them non mobile
are cancerous nodes tender
not usually but could be with late findings when cancer has spread to surround nerves
Lymphomas are
malignant neoplasms of component cells of lymphoid tissues
Broad division of the group into Hodgkin and non-Hodgkin lymphomas
is widely accepted
