Histo 4: Vessels Flashcards
What are the three layers of a vessel (from inside to outside)?
- Tunica Intima
- Tunica Media
- Tunica Adventitia OR Tunica Serosa
Are endothelial cells in every vessel?
yes
endothelial morphology
simple squamous
angiogenesis
growth of new blood vessels
Various Functions of Endothelial Cells
Barrier
Production of the Basement Membrane
Vasoactive Factors
Angiogenesis
What is the only layer of a vessel in a capillary?
tunica intima
How are endotheliel cells joined in capillaries?
tight junctions
3 Types of Capillary Endothelium
- Continuous
- Fenestrated
- Sinusoidal
hemangiopericytomas
tumors of the pericytes surrounding capillaries
Most prevalent capillary type?
continuous
Where do you find fenestrated capillaries?
tissues with substantial fluid transport (GI tract, kidney, endocrine organs)
In what organ is the diaphragm (thin membrane) of the fenestrated capillary not found?
kidney
In what type of capillary do you most commonly find vesicles?
continuous
Unique Features of SInusoidal Capillaries
open up into a non-vascular space
larger than most capillaries
lacks uniformity in diameter (slows blood flow)
Where do you find sinusoidal capillaries?
liver, bone marrow, spleen, nasal cavity, some endocrine
Which has an internal elastic lamina - arteries or veins?
arteries
Best way to distinguish arteriole vs. venule?
amount of smooth muscle in the tunica media
Which sometimes has valve - veins or arteries?
veins
Which sometimes looks misshapen - veins or arteries?
veins
In what tissue do you find high endothelial vessels (HEV)?
lymphoid
What is unique about the endothelium of HEVs?
simpple cuboidal, with an incomplete basement membrane and very thin connective tissue
Where would you never find fenestrated capillaries?
anywhere there’s a barrie, ex: blood-brain
Biggest difference between veins and lymphatics?
you will not see any erythrocytes in lymphatic tissue
Label vein, artery, capillary, lymphatic.
Vein = 5
Artery = 1, 3
Lymphatic = 2
Capillary = 4
