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Lecture 25
Lymphatic System
30
Anatomy
Undergraduate 2
11/06/2010

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Term
lymphatic vessels
Definition
-widely distributed throughout body
-run alongside blood vessels within loose CT
Term
lymphatic capillaries
Definition
-begin as blind ended tubes
Term
medium large lymphatic vessels
Definition
-thicker walled than capillaries
-smooth fibers surround vessel
-valves
Term
lymphatic ducts
Definition
-right and thoracic
-largest lymph vessels
-thickest walled
-valves
Term
lacteals
Definition
-found only in intestine
-transport products of fat digestion
Term
function of lymphatic system
Definition
-removal and transport of tissue fluid
-immunological defenses
-drainage system (one direction)
Term
lymph drainage
Definition
tissue, lymph capillaries, lymph vessels, lymph ducts, venous system
Term
right lymphatic duct
Definition
-drains right upper extremeties
-empties into right subclavian
Term
left lymphatic duct
Definition
-drains everything else
-empties into left subclavian
Term
lymph
Definition
-clear, watery
-plasma
-plasma proteins
-lipids
-lymphocytes
-misc debris (bacteria, malignant cells, viruses)
Term
formation of lymph
Definition
-due to differences in pressure, more fluid leaves capillaries than is returned
Term
transport of lymph
Definition
-rhythmic contraction of skeletal muscles
and abdominal organ muscles push fluid along
-negative pressure in thorax helps drain fluid up through thoracic duct
-valves
Term
lymph nodes
Definition
-small, oval, clusters of lymphoid tissue
Term
lymph node function
Definition
-filtration of foreign particles
-production of lymphocytes
Term
structure and contents of lymph nodes
Definition
-enclosed in fibrous capsule
-afferent/efferent vessels
-reticular fibers
-macrophages
-aggregation of t-cells
-germinal centers
Term
reticular fibers
Definition
-meshwork which traps debris
Term
germinal centers
Definition
area where B cells develop and become plasma cells which make antibodies
Term
spleen
Definition
-left upper quadrant
-between 9th and 11th ribs
-lateral posterior to stomach
Term
spleen structure
Definition
-red pulp
-white pulp
-reticular fibers
-sinusoids
Term
red pulp
Definition
-blood flowing though meshwork of fibers
Term
white pulp
Definition
-clusters of lymphoid tissue
Term
sinusoids
Definition
-irregular passageway of blood
Term
spleen function
Definition
-production of blood cells (fetal-all, adult-lymphocytes)
-storage-platelets, WBC, RBC, iron
-filtration-disposes old RBCs
-immune function-produces lymphocytes and antibodies
Term
spleen function
Definition
-production of blood cells (fetal-all, adult-lymphocytes)
-storage-platelets, WBC, RBC, iron
-filtration-disposes old RBCs
-immune function-produces lymphocytes and antibodies
Term
thymus
Definition
-bilobed mass of lymphoid tissue
-in thorax
Term
thymus function
Definition
-during prenatal and postnatal it produces T cells
-usually degenerates with age
Term
tonsils
Definition
-clusters of lymphoid tissue
-guard entrance to resp/dig system
-pharyngeal
-paletine
-lingual
Term
pharyngeal tonsils
Definition
-roof of nasopharynx (adenoids)
-can cause ear infection if inflamed
Term
palatine
Definition
-"the tonsils"
-each side of oropharynx
Term
lingual
Definition
located posterior 1/3 of tongue
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