histology Flashcards
describe the layers of blood vessels
tunica intima
tunica media
tunci adventitia
what is the tunica intima made of
single layer of endothelial cells with basal lamina and connective tissue
what are endothelial cells
squamous epithelial cells
what is the tunica media made of
muscle
what is the tunic adventitia made of
connective tisuse
what do elastic fibres in the tunica media of elastic arteries provide
elastic recoil
in elastic arteries what is their own vascular supply called
vaso vasorum
what cells do capillaries have at intervals outisde the basal lamina
pericytes
what do pericytes do
connective tissue cells that have contractile properties
what are the most common type of capillaries
continuous
where are fenestrated capillaries found
mucosa of gut
endocrine glands
kidney glomeruli
where are sinusoidal (discontinuous) capillaries found
liver spleen and bone marrow
what do sinusoidal capillaries have
large gaps through which macromolecules can pass
compare the tunica media in veins to that of arteries
veins is thinner
- media contains muscle so arteries need more
what are the valves in veins
inward extensions of the tunica intima
