What structure is labeled #3 in this canine heart specimen?
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The structure labeled 3 on the canine heart specimen is the right ventricle. The left side of the heart is facing you with #1, the left ventricle, making up the cardiac apex.
The collapsed/thin-walled pulmonary artery (#5) exits the right ventricle and carries deoxygenated blood to the lungs. Note the difference between the thin-walled pulmonary artery and the thick walled aorta (#7) which exits the left ventricle.
The atria are not visible, however, look for the left (#11) and right (#10) auricular appendages which lie adjacent to the atria. Note the arterial ligament (#6), which is the remnant of the fetal ductus arteriosus and connects the pulmonary trunk (5) and aorta (7). Failure of this vessel to close at birth results in the congenital condition patent ductus arteriosus.
