Topic 46 - Lymphatic vessels

Question 1

What is lymphatic vessels?

Answer 1

• Drainage vessel system.

* Begins with lymph capillaries in tissues

Question 2

What is their function?

Answer 2

carry excess extracellular fluid into circulation

Question 3

What is Lymphatic capillaries?

compare to blood capillaries

Answer 3

-fine tube-like spaces lined by endothelium. Wider and more irregular shaped than the blood capillaries and never contain blood corpuscles. Lack lamina basalis and pericytes. Collect into lymphatic vessels.

Question 4

Lymphatic vessels (histologically resemble veins)
Tunica intima

Answer 4

endothelium + subendothelial CT

Question 5

Lymphatic vessels (histologically resemble veins)
Tunica media

Answer 5

circular smooth muscle + few elastic fibres

Question 6

Lymphatic vessels (histologically resemble veins)
Tunica adventitia

Answer 6

longitudinal smooth muscle + collagen fibres