） PulmonarycirculationRightventriclePulmonaryACapillaries of lungPulmonaryVLeftatriumsever as a gas-exchange course
Ⅱ）Pulmonary circulation Right ventricle Pulmonary A. Capillaries of lung Pulmonary V. Left atrium • sever as a gas-exchange course
The heartI.ThelocationIl.The external featuresIll. The cardiac chambersIV.The structureV.The conduction systemVI.ThevesselsVll.Pericardium
The heart I. The location VI. The vessels V. The conduction system IV. The structure VII. Pericardium III. The cardiac chambers II. The external features
I.The location.middlemediastinum,betweentwo lungs,enclosedinthepericardium·Anteriorly:sternum,2nd→6th costal cartilages.Posteriorly:5th→8ththoracicV..1/3 of it on the right of themedian sagittal plane.2/3ofiton.theleftofthemedianplaneSternalangleSuperiorIVmediastinum/posteriormediastinumanseeoreMiddlemediastinum
I. The location • middle mediastinum, between two lungs, enclosed in the pericardium • Anteriorly: sternum, 2nd → 6th costal cartilages • Posteriorly: 5th → 8th thoracic V. • 1/3 of it on the right of the median sagittal plane • 2/3 of it on the left of the median plane
ll.Theexternal featuresconicalinshape1apex(cardiacapex)formedbyleftventricledirecteddownwards.forwardsandtotheleftLeftvenfricle
II. The external features • conical in shape • formed by left ventricle • directed downwards, forwards and to the left 1 apex （cardiac apex） Left ventricle
1base(cardiacbase?formed by atria (chiefly byleft atrium)directedbackward,upward,andto therightSuperior vena cavaLeftatriumRightatriumPulmonaryyInferiorvena cava
• formed by atria ( chiefly by left atrium) • directed backward, upward, and to the right 1 base （cardiac base） Left atrium Right atrium Superior vena cava Pulmonary V. Inferior vena cava