blood vessels Flashcards
tunica media
smooth muscle cells arranged circularly around the blood vessel, allow for vasodilation/constriction
tunica intima
innermost tunic, contains endothelium, basement membrane , lamina, inner elastic membrane
tunica externa (adventitia)
connective tissue layer, outermost
artery vs vein anatomy
artery: much thicker media allows for contraction, thicker wall holds up under pressure
vein: thinner media/wall bc not as much pressure and doesn’t contract
elastic arteries
largest, closest to heart, have a lot of elastic fibers so they can expand/return back to normal size during contraction
muscular/conducting arteries
can vasodilator/constrict to conduct blood based on bodies needs
arterioles
smallest in body, can vasodilate/constrict, feed into capillary network
aortic arch
arches posteriorly and to the left, contains brachiocephalic, left common carotid, left subclavian
capillaries
allow for material exchange btwn tissues and blood
valve
an infolding of tunica intima, ensures 1 way movement of blood
ascending aorta
where right and left coronary arteries branch from
descending aorta
contains thoracic aorta and abdominal aorta
parietal branch of thoracic aorta
supply blood to thoracic wall and diaphragm
visceral arteries
supply organs in the thorax
visceral branches of abdominal aorta
supply the organs, branches into celiac trunk, superior mesenteric, inferior mesenteric
celiac trunk
supplies liver, gallbladder, spleen, stomach, pancreas, first part of small intestine
superior mesenteric branch
supplies 2nd and 3rd parts if small intestine, 1st half of large intestine (colon)
inferior mesenteric branch
supplies 2nd half of large intestine
major veins
coronary sinus
sup vena cava
inf vena cava
coronary sinus
drains heart
superior vena cava
drains head, neck, thorax, upper limb
inferior vena cava
drains abdomen, pelvis, lower limbs
