Lymphatic Structures And Lymph Flow Flashcards
Describe the anatomical features of lymph nodes
Connective tissue capsule
List 4 important functions of lymph nodes
Removal of
Pre collectors
Precollector is both a transport and collecting vessel
It can absorb LOL in sm amounts and transport lymph from initial LV to to collectors
They are interconnected with skin zones.
They are smaller than collectors and bigger than ILV
Initial lymph vessels
Initial lymph vessels are the smallest vessels and form the beginning of the lymphatic vascular system.
Found in the entire dermis and drain LOL from the connective tissue.
They have a blind origin in the tissue like fingers in a glove.
They cosist of a single layer of endothelial cells that overlap on the edges so they open like shutter valves.
The ILV transports the LOL to the precollectors.
What is a lymphangion?
Any portion of the lymph vessel thats between two valves is a lymphangion.
Name 3 mechanisms which control smooth muscle in collector vessels.
Lymphangiomotoricity=
Autonomous motoricity
Passive distension- from inside ( filling pressure)
from outside ( distension pressure)
Internal and external stimuli
Temperature rise
Muscle and joint pump Arterial pulsation Respiration and peristalsis Negative intrathoracic pressure ( negative pressure in the thorax) External pressure ( mld and bandaging)
What mechanisms allow uptake of fluids by the ILV?
When pressure is low valves are closed, when pressure is up it pulls on the anchoring filaments that are attached to the fibre network ( endothelial cells) which opens the valves so fluid can enter the vessel.
List at least 6 functions of the lymphatic vascular system.
To circulate lymphocytes- immune system
Removal of fluid
Removal of lge proteins and lipids
Removal of organic and inorganic wastes-
Assists in maintaining blood volume
Maintain protein circulation
( waste going into blood ie carbon dioxide)
Name three mechanisms which control smooth muscle in collector vessels
Muscle and joint pump Arterial pulsation Respiration and peristalsis Negative intrathoracic pressure External pressure (MLD and bandaging)
Upper left lobe of lung
Bronchomediastinal trunk to thoracic duct
Contraction of collector smooth muscle is controlled by…
Sympathetic nervous system
What happens when sympathetic activity is high?
Running from the bear!
Stress is high!
It suppresses and flow slows down.
Where are initial lymph vessels found?
In loose connective tissue (where blood capillaries are)
What do B cells do?
They produce plasma cells which manufacture antibodies
Proteins in the tissues attract water. This is known as….
Cotp
