Canine Heart Anatomy Simplified 🐶🫀

Canine Heart Anatomy

The heart is the central organ of the cardiovascular system, pumping blood throughout the body. In dogs, it is located in the chest between the lungs, slightly left of the midline. It has four chambers: the right atrium, right ventricle, left atrium, and left ventricle.

Blood Flow Through the Heart

1. Body to the right side: Deoxygenated blood returns from the body to the right atrium through the cranial and caudal vena cava.
2. Right side to the lungs: Blood passes through the tricuspid valve into the right ventricle, which pumps it through the pulmonary artery to the lungs for oxygenation.
3. Lungs to the left side: Oxygen-rich blood returns to the left atrium through the pulmonary veins.
4. Left side to the body: Blood passes through the mitral valve into the left ventricle—the heart’s strongest chamber—which pumps it into the aorta for distribution throughout the body.

Other Important Structures and Functions

• The tricuspid and mitral valves help keep blood flowing in the correct direction.
• The heart muscle receives its own oxygen supply from the coronary arteries, which branch from the aorta.
• The sinoatrial (SA) node, located in the right atrium, coordinates rhythmic heart contractions and acts as the heart’s natural pacemaker.

Clinical Relevance

Understanding normal heart anatomy can help explain cardiac conditions. Heart murmurs may indicate valve dysfunction, while arrhythmias may point to problems with the heart’s electrical system.

Speakers and Sources

• Narrator: Unidentified voice providing the educational explanation.
• Channel/source: Vetwisdom.