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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.