deck_16394788 Flashcards
What are the 3 major functions of the lymphatic system
Functions of lymphatic system
- Draining excess IF
- Carry out immune responses
- Transporting dietary lipids absorbed by GI tract to blood
What are the 4 components of Lymphatic system
Components of Lymphatic system
Lymph
Lymphatic vessels
Lymphatic tissues
Lymphocytes
How is lymph different from IF?
Lymphatic Fluid
Contains immune cells
Why does lymph have a “milky” appearance?
Lymphatic Fluid
Absorbed dietary lipids
Lymphatic vessels are often called what?
Lymphatic vessels
Lymphatics
Where does the lymphatic network begin?
Lymphatic Vessels
Lymphatic capillaries
In what ways are Lymph capillaries different from blood capillaries?
Lymphatic Vessels: Capillaries
Closed @ one end
Larger diameter
Thinner walls
What is the purpose of overlapping endothelial cells in lymph capillaries?
Lymphatic Vessels: Capillaries
One-way valve permitting entry
Due to pressure changes
What are lacteals?
Lymphatic Vessels: Capillaries
capillaries located in small intestine
Carry dietary lipids
What is Chyle
Lymphatic Vessels: Capillaries
Creamy white lymph in lacteals
Lymphatic vessels are similar to veins in what way?
Lymphatic Vessels
Contain valves to prevent backflow
Vessel bulges at each valve
Superficial lymphatics are located where?
Lymphatic Vessels
Subcutaneous layer of skin
Mucous membranes
Serous membranes
Deep lymphatics are located where?
Lymphatic Vessels
skeletal muscles, organs of neck, limbs, trunk
6 steps of lympatic flow
From periphery to central vasculature
Lymphatic Flow
- Begins as IF
- Enter lymphatic capillaries
- Travel to regional lymph nodes
- Enter lymphatic trunks
- Drain into R or L lymphatic duct
- Return lymph to blood at subclavian veins
What are the 5 principle lymphatic trunks
Lymphatic flow: Lymphatic Trunks
Lumbar
Intestinal
Bronchomediastinal
subclavian
jugular
Which two ducts do Lymphatic trunks drain into?
Lymphatic Flow: Lymphatic ducts
Thoracic duct
Right lymphatic duct
Thoracic duct collects lymph from?
Lymphatic Flow: Lymphatic Ducts
Entire body inferior to diaphragm
Left side superior to diaphragm
Right lymphatic duct collects lymph from?
Lymphatic Flow: Lymphatic Ducts
Right side superior to diaphragm
Where does the Thoracic duct begin?
Lymphatic Flow: Lymphatic ducts
Cisterna chyli (anterior to L2)
How does lymph move
Lymph movement
- Pressure in interstitial space
- Skeletal muscle contractions
- Pressure during breathing
What is lymphedema?
Lymphadema
Blocked lymphatic drainage
most often in limbs
Lymphoid tissues may be either?
Lymphoid tissues
Lymphoid nodules
lymphoid organs
What are lymphoid nodules
Lymphiod tissues
densely packed lymphocytes in area of areolar tissue
no capsules