Lymphatics

Question 1

Where do lymph capillaries drain excess fluid from?

Answer 1

Interstitial spaces

Question 2

Where are there no true lymphatic vessels found?

Answer 2

Superficial portions of skin
CNS (?)
Endomysium of muscle
Bones

Question 3

What drains the lower body and left side of head, left arm, and part of the chest?

Answer 3

Thoracic duct

Question 4

What drains the right side of the head, neck, right arm, and part of chest?

Answer 4

Right lymph duct

Question 5

True lymphatic vessels were just discovered in what part of the CNS?

Answer 5

near dural venous sinuses
(lymph gets here from perivascular spaces that communicate with subarachnoid space –arachnoid villi–dural venous sinuses)

Question 6

What factors increase lymph formation?

Answer 6

Anything that increases filtration and/or decreases reabsorption

Question 7

What is the rate of lymph formation/flow in the:

• Thoracic duct
• Right lymphatic duct
• Total lymph flow

Answer 7

• Thoracic duct: 100 ml/hr
• Right lymph duct: 20 ml/hr
• Total: 120 ml/hr (volume of entire plasma volume is filtered each day)

Question 8

What are 4 functions of the lymphatics?

Answer 8

1. Return lost protein to vascular system
2. Drain excess plasma filtrate from ISF space
3. Carry absorbed substances from GI
4. Filter lymph at nodes

Question 9

What are lymph nodes?

Answer 9

meshwork of sinuses lined with tissue macrophages (phagocytosis), B cells, T cells, and dendritic cells