LP #106 Lymphatic System Flashcards
Capillaries:
______ _______: collection of excess IF facilitated by minvalves
______: protein filaments hold vessels in place; increase in IF opens minivalves
____ _____: facilitate collection of proteins & cellular debris from IS
______: ensure one-way flow towards heart
- Highly permeable
- Anchored
- Large openings
- Valves
Lymph flows through vessels & nodes which coverage on 2 large ducts that return fluid to venous system & heart:
- right lymphatic duct (smaller)
- thoracic duct (larger)
General lymphatic pathways
- extremities: collecting vessels travel along superficial venous pathways (just deep to skin)
- visceral vessels & larger trunks: follow deeper arteries
5 major trunks- 4 paired, 1 single:
Paired:
- lumbar: from lower limbs
- bronchomediastinal: from thorax
- subclavian: from paper limb
- jugular: lymph from head & neck
1 single:
-intestinal: from digestive tract
- trunks deliver lymph to thoracic or right lymphatic duct
- thoracic duct collects lymph from lower half & left side of body
- right lymphatic duct collects lymph from right side of upper half of body
Lymphatic vessels
- lymphatic system is associated with immune organs & tissues known as _____ _____
- ______ _______ includes nodes & organs/tissue known as other lymphoid organs
- collectively they have immune functions designed to prevent harmful substances from entering body, and/or remove them once they gain entry
Lymphoid structures
- filtering units located at junctions of lymphatic system
- contains immune against- antibodies & lymphocytes
- destroy unwanted materials
Lymph nodes
Lymph node structures Shape? Size? -encapsulated w/fibrous capsule -fibrous extensions provide internal skeleton
Shape: small kidney bean shape
Size: range- grain o rice to small marble
Lymph nodes regions
- cortex: outer layer
- contains immune cells
- medulla: contains large sinuses demarcated y cords (in folding sheets of the cortex)
- contain macrophages
Lymph enters nodes via ? & leaves via?
More ? Than there are ?
- afferent vessels & efferent ones
- afferent vessels than efferent vessels
4 structures are classified as other lymphoid organs
- spleen
- thymus
- tonsils
- MALT
- large organ, roughly size of a fist
- posterior to stomach in L hypochondriac region
- functions:
- lymphocyte production
- storage of platelets
- breakdown of old RBC
- extract debris from blood
Spleen
- small, bi-lobe (butterfly)
- prominent in newborns & childhood
- within mediastinum,deep to sternum
- functions:
- produces active T lymphocytes
- active during early life; atrophies & by adulthood is largely composed of fibro-fatty tissue
Thymus
- 4 groups of lymphatic tissue
- small glands
- within entrance to mouth & nasal passages:
- palatine: both sides of posterior aspect of oral cavity
- lingual: at base of tongue
- pharyngeal (aka. Adenoids): posterior wall of nasopharynx
- tubal: around opening of auditory tubes
- fxn:
- trap inhaled/ ingested foreign matter
- once trapped, lymphocytes destroy ingested matter
Tonsils
-shape: group of tissues ( includes tonsils); line the digestive & respiratory tracts
-size: variable
-location:
*tonsils:
*peyers patches: small intestine
*appendix: proximal large intestine
*bronchial lymphoid nodules: bronchi of lungs
Fxn: trap foreign matter for presentation to lymphocytes
MALT (mucosal associated lymphoid tissues)
