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21 terms

External structures of the heart

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Fibrous pericardium
outer fibrous bag; tough and protective.
Parietal pericardium
inner liner of fibrous pericardium.
visceral pericardium
covers heart.
pericardial cavity
between parietal and visceral pericardium; contains serous fluid which reduces frictions as heart moves.
pericarditis
inflammation of pericardium; caused by viral or bacterial infection; adhesions attach layers'; very painful.
epicardium
outer layer; serous membrane that reduces friction.
myocardium
middle layer; thickest; "power' layer, thickness gives strength; mostly cardiac muscle.
endocardium
inner layer; epithelial and connective tissues that lines heart cavity and valves.
superior vena cava
returns blood from head, neck, shoulders, arms; carries deoxygenated blood back to heart.
inferior vena cava
collects blood from lower body; carries deoxygenated blood back to heart.
aorta
carries oxygenated blood from heart; originates from left ventricle; branches to carry blood to all parts of body; carries oxygenated blood.
pulmonary trunk
originates in right ventricle.
left and right pulmonary artery
carries deoxygenated blood to lungs; out of back of heart (blue)
left and right pulmonary veins
carries oxygenated blood back to left atrium; 2 from each lung (red)
coronary vessels
on surface of heart; separates right atrium from right ventricle; coronary artery and vein lie in:
interventricular
groove- separates right and left ventricles.
apex
tip end of the heart
atria
there are two of them the right atrium and left atrium; receiving chambers; auricles- mushroom cap that can expand to provide extra spaces; on surface; right auricle and left auricle.
Superior and inferior vena cava empty into right atrium; pulmonary veins empty into left atrium.
ventricles
there are two right ventricle and left ventricle; pumping chambers; largest part of heart.
deoxygenated
right
oxygenated
left