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Right atrium
Blood enters from the anterior vena cava.
Right ventricle
No specific definition provided.
Left atrium
More muscular than the right atrium.
Left ventricle
More muscular because it pumps blood out to the body.
Interventricular septum
The muscular wall separating the right and left ventricles (inside the heart).
Interventricular groove
Sulcus is located outside of the heart. It separates left from right, also known as anterior interventricular sulcus and posterior interventricular sulcus.
Right auricle
Ear-shaped; stores blood.
Left auricle
Ear-shaped, stores blood.
Chordae tendineae
Small tendons that hold atrioventricular (A-V) valves in place and connect papillary muscles to valves.
Papillary muscles
Prevent backflow of blood, hold A-V valves in place (connected via chordae tendineae).
Trabeculae carneae
Ridges within ventricles.
Pulmonary valve
Between the right ventricle and pulmonary trunk.
Left atrioventricular valve
Atrioventricular valves prevent the backflow of blood between the left atrium and left ventricle.
Right atrioventricular valve
Between the right atrium and right ventricle.
Aortic valve
Between the left ventricle and aorta.
Epicardium
Outermost layer of the heart, shiny.
Myocardium
Middle muscular layer of the heart.
Endocardium
Inner lining of the heart.
Aorta
From the left ventricle, out to the body.
Aortic Arch
No specific definition provided.
Pulmonary artery
Right ventricle to lungs.
Pulmonary veins
Transport oxygenated blood from the lungs to the heart.
Caudal vena cava (post cava)
No specific definition provided.
Cranial vena cava (pre cava)
No specific definition provided.
Brachiocephalic artery
No specific definition provided.
Left common carotid artery
No specific definition provided.
Left subclavian artery
Branch of the aorta; turns into the axillary artery after crossing the thoracic wall.
Right subclavian artery
Branch of the Brachiocephalic artery. Turns into the axillary artery after crossing the wall.
Right common carotid artery
Branch of the brachiocephalic artery.
Coronary arteries
Transport oxygenated blood to the heart muscle.
Right brachiocephalic vein
Turns into the axillary vein after crossing the thoracic wall.
Left brachiocephalic vein
Turns into the axillary vein after crossing the thoracic wall.
Right external jugular vein
No specific definition provided.
Left external jugular vein
No specific definition provided.
Trachea
No specific definition provided.
Primary Bronchi
Singular – bronchus; First branch off the trachea.
Lung
Seven total lobes.
Left Lung
Consists of anterior (cranial) lobe, middle lobe, and posterior (caudal) lobe.
Right Lung
Consists of anterior (cranial) lobe, middle lobe, posterior (caudal) lobe, and mediastinal (accessory, or azygos) lobe.
Diaphragm
Separates the thoracic and abdominal cavities.
Note 
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