microanatomy of the vascular system L11 Flashcards
3 layers of all vessels
tunica interna
tunica media
tunica externa
inner lining of blood vessels
tunica interna
inner most layer of tunica interna
endothelium
epithelium of endothelium
simple squamous
3 parts of tunica interna
endothelium
basal lamina
internal elastic lamina
tunica media=
muscular and connective tissue layer
what is the primary function of smooth muscle cells
regulating diameter of lumen
what separates the tunica media from the tunica externa
external elastic lamina (part of tunica media)
what is the outer covering of blood vessels
tunica externa (adventitia)
what does the tunica adventitia hold
vaso vasorum
lymphatics
autonomic nerves
what does blood pressure depend on
cardiac output and peripheral resistance
what determines resistance
blood viscosity and dimensions of the vessels
what are large arteries also called
elastic arteries
in small arteries what is there more off
smooth muscle
what are small arteries also known as
muscular arteries
3 types of capillary
continous
fenestrated
discontinuous
what is almost absent in capillaries
tunia media
most common capillary
continous
what are fenestrated capillaries
endothelium has pores for exchange, they appear regularly
where are fenestrated capillaries common
tissues with high exchange function (e.g small intestine0
what are discontinuous capillaries
gaps between endothelial cells as well as regular fenestrations
where are discontinuous capillaries found
where cell as well as molecular exchange happens (liver, spleen)
veins are lacking a
internal elastic lamina
veins have a relatively thin
tunica media for lumen size
