54 terms



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The highest point.
A support or foundation.
Sternocostal Surface
Formed by the anterior surfaces of the right atrium and ventricle.
Diaphragmatic Surface
Is formed primarily by the posterior, inferior wall of the left ventricle.
Coronary Sulcus
Groove that marks border between atria and ventricles.
Atrioventricular Groove
Coronary groove or sulcus of the heart which demarcates the borders of the underlying atria from the ventricles.
Anterior Interventricular Sulcus
A shallow groove on the anterior surface of the heart that marks the external boundary between the right and left ventricles.
Posterior Interventricular Sulcus
Depression on the posterior surface of the heart. Marks the division of the left and right ventricles.
Right Atrium
The right upper chamber of the heart that receives blood from the venae cavae and coronary sinus.
Right Auricle
Ear like projection from Right Atrium. Located above the RCA and coronary sulcus.
Superior Vena Cava
Receives blood from the head and arms and chest and empties into the right atrium of the heart.
Inferior Vena Cava
Receives blood from lower limbs and abdominal organs and empties into the posterior part of the right atrium of the heart.
Coronary Sinus Opening
Opens into right atrium between inferior vena cava opening and right atrioventricular orifice.
Pectinate Muscles
Prominent muscular ridges along the inner surface of the auricle and across the adjacent anterior atrial wall.
Fossa Ovalis
A shallow depression in the interatrial septum that marks the spot where an opening, the foramen ovale, existed in the fetal heart.
Interatrial Septum
The wall or septum that divides the left and right atria.
Interventricular Septum
Partition between right and left ventricle.
Right Ventricle
The chamber on the right side of the heart that receives venous blood from the right atrium and pumps it into the pulmonary trunk.
Tricuspid Valve
Valve between the right atrium and the right ventricle.
Papillary Muscles
Responsible for pulling the atrioventricular valves closed by means of the chordae tendineae.
Chordae Tendinae
Fibers attatched to the tricuspid valve which pull it closed when papillary muscles contract, preventing backwash of blood.
Trabecular Carnae
Internal ridges on both ventricles.
Moderator Band
This structure stretches from a papillary muscle on the interventricular septum to the wall of the right ventricle. Functionally it is important because it conducts impulses between these two regions on the heart, thereby coordinating the contraction of the cells and it may also help prevent overdistention of the ventricular wall.
Conus Arteriosus
A prolongation of the ventricle of amphibians and some fishes that has a spiral valve separating venous blood going to the respiratory arteries from blood going to the aorta and systemic arteries.
Pulmonary Semi-lunar Valve
Valve between right ventricle and pulmonary artery.
Pulmonary Trunk
The artery that carries venous blood from the right ventricle of the heart and divides into the right and left pulmonary arteries.
Left Atrium
The left upper chamber of the heart that receives blood from the pulmonary veins.
Left and Right Pulmonary Veins
Deliver blood to the atrium.
Left Auricle
Located on the anterior surface of the left atrium and allows it to receive extra blood.
Valve between left atrium and left ventricle.
Left Ventricle
The chamber on the left side of the heart that receives arterial blood from the left atrium and pumps it into the aorta.
Papillary Muscles
Responsible for pulling the atrioventricular valves closed by means of the chordae tendineae.
Aortic Semi-lunar Valve
At the entrance to the aorta. Valve with three half moon cusps. Prevents blood from flowing back into the left ventricle when the left ventricle relaxes.
The large trunk artery that carries blood from the left ventricle of the heart to branch arteries.
Pacemaker Cells
A group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates heartbeat rate.
Sinoatrial Node
A specialized bit of heart tissue that controls the heartbeat.
Artioventricular Node
Area of specialized cardiac muscle that receives the cardiac impulse from the sinoatrial noe and conducts it to the atrioventricular bundles.
Atrioventricular Branches
Left and Right branches. Leaves the atrioventricular node and travels to the interventricular septum. Gives rise to Purkinje Fibers.
Right Bundle Branches
Passes action potentials to the ends of right and left ventricles.
Left Bundle Branches
Branches from atrioventricular bundle, take signal to apex of heart.
Purkinje Fibers
Fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract.
Left Coronary Artery
Coronary artery with two branches that supplies blood to the left side of the heart.
Anterior Interventricular Artery
Branch of left coronary artery; travels down anterior interventricular sulcus toward apex; supplies interventricular septum and anterior walls of ventricles.
Circumflex Artery
Supplies blood to left atrium and posterior left ventricle.
Right Coronary Artery
This supplies the right atrium and ventricle, the inferior portion of the left ventricle, the posterior septal wall and the sinoatrial Atrioventricular nodes.
Marginal Artery
Artery that branches off the right coronary artery near the small cardiac vein.
Posterior Interventricular Artery
A branch of the right coronary artery, lies in the posterior interventricular sulcus and supplies blood to the posterior and inferior part of the heart.
Junctions between blood vessels serving the same organ, if blood supply is cut off from one place it is rerouted.
Coronary Sinus
A short sinus receiving most of the veins of the heart.
Great Cardiac Vein
The anterior vein of the heart that runs in the interventricular sulcus, and feeds into the coronary sinus at its left end.
Middle Cardiac Vein
Vein that drains the area supplied by the posterior interventricular artery.
Posterior Cardiac Vein
Collects blood from the posterior aspect of the heart; carries blood from the apex toward the coronary sulcus and empties into the coronary sinus.
Small Cardiac Vein
Vein that receives blood from the posterior surfaces of the right atrium and ventricle, in between great and middle.
Anterior Cardiac Vein
Vein that runs along the outside of the heart; runs vertically right over the right ventricle.