Base of the heart is formed by
A. Left and right ventricle
B. Left atrium and ventricle
C. Right atrium and ventricle
D. Left and right atrium
A. Left and right ventricle
B. Left atrium and ventricle
C. Right atrium and ventricle
D. Left and right atrium
Ans.
D. Left and right atrium*
o The base of the heart,
directed upward, backward, and to the right, is separated from the fifth,
sixth, seventh, and eighth thoracic vertebra by the esophagus, aorta, and
thoracic duct.
o It is formed mainly by the left atrium, and, to a small extent, by the
back part of the right atrium.
o Somewhat quadrilateral in form, it is in relation above with the bifurcation
of the pulmonary artery, and below by the posterior part of the coronary
sulcus, containing the coronary sinus.
o On the right it is limited by the sulcus terminalis of the right atrium
o The four pulmonarv veins, two on either side, open into the left atrium,
while the superior vena cava opens into the upper, and the inferior vena cava
into the lower, part of the right atrium.
