nerves and vessels Flashcards
pulmonary artery carries
deoxygenated blood from RV to lungs
systemic artery carries
oxygenated blood from LV to whole body
anastomoses =
link tubular structures
-alternative route for blood circulation
true anastomoses
in the hand, between branches of muscular arteries
potential anastomoses
not permanently present
arteriovenous anastomoses
directly between small arteries and veins
-temp regulation, and erectile tissue
end arteries - how are they isolated:
artery is the only supply to a particular part
end arteries - anatomical end arteries:
-no anastomoses
-to parts of brain, to retina
end arteries - functional end arteries:
potential anastomoses eg. coronary arteries
neurovascular supply to arteries
sympathetic (vasomotor) nerve fibres lead to vasodilation except erectile tissue - parasympathetic nerves cause vasodilation
vasa vasorum = blood supply to tunica media and tunica adventitia
blood flow through veins (3):
- vascular venous pump - artery in the middle and veins on either side (venae comitantes + valves)
- muscular venous pump
- thoracic venous pump
PNS - have … cranial nerves that have parasympathetic function
4
anastamoses around joints
alternative flow pattern when artery kicked by joint flexion
how are spinal nerves mixed
have motor and sensory nerves
posterior ramus of spinal nerve innervates
muscles and tissues of our back
anterior ramus of spinal nerves converge and intermingle to form
plexuses
what is myotome
group of muscles innervated by motor fibres
what is dermatome
area of skin innervated by sensory fibres supplied by individual spinal nerve
all of our SNS arises in spinal cord between
T1-L2
-find cell bodies of the preganglionic sympathetic nerves
-ganglionated cord
-paravertebral ganglia
venae comitantes
pair of veins, the closely accompany an artery
vasa vasorum
small blood vessels that supply the walls of larger arteries and veins
end artery
artery that is the only supply of oxygenated blood to a portion of tissue - no anastamoses
collateral circulation
alternate blood vessels that can take over when another artery/vein is blocked or damaged
arterial system arises from
ventricles of the heart
-pulmonary and systemic
large artery have low/high resistance and conducting
low resistance
main resistance vessels that control regional blood flow
arteriole
exchange vessels between arteries and capillaries are called =
capillaries
anastamoses around joints
alternative flow pattern when artery kinked by joint flexion
which anastamoses involved in temp regulation
arteriovenous anastamoses
veins, capillaries, small veins (venules) in size order from smallest to biggest
capillaries –> small veins (venules) –> veins
