The coronary sinus (which drains blood from the heart itself) also drains into the sinus venarum
Transverse ridge of tissue between the two caval openings inside the right atrium (where the cranial and caudal vena cavas drain into the sinus venarum).
Slit-like depression where the fetal foramen ovale existed, allowing blood to pass from the right to left atrium.
Why does a fetus need the foramen ovale, but it closes to become the fossa ovale after birth?
A fetus is not breathing using its lungs with in utero; therefore, blood can travel directly between the two ventricles without going to the lungs first. Once a neonate breathes on its own, thi opening must close to force blood to travel to the lungs first to pick up oxygen.
The fossa ovalis is caudal to the _______ on the _________ of the __________.
Intervenous tubercle on the inside of the right atrium
Interlacing muscles on the internal surface of the wall of the right auricle.
The smooth-surfaced, thick portion of the heart muscle in the right atrium; shaped like a semi-lunar crest.
The crista terminalis is the muscle from which the _________ radiate in both atria; this also associated with the __________ (aka. ____________) IN THE RIGHT ATRIUM.
pectinate mm.; sinoatrial node; pacemaker
The right ventricle communicates with the right atrium via the ____________.
The septal cusp of the atrioventricular valve continues to the septal wall of the ventricle by ____________, which are attached to the septal wall by ___________.
chordae tendinae; 3-4 papillary muscles
The muscular irregularities of the interior of both of the ventricular walls.
The right ventricle ejects ________ blood into the _______, which transports the blood to the _________, which subsequently send the blood to the _________.
deoxygenated; pulmonary trunk; pulmonary arteries (left and right); lungs
The pulmonary trunk is located...
between the auricles
Muscular strand that that extends across the lumen of the right ventricle from the septal to the parietal walls.
Thin, concave fold of tissue that is present on the cranial part of the left interatrial septal wall; remnant of fetal passageway.
valve of foramen ovale
The left atrium receives ________ blood from the lung via...
oxygenated; 5-6 pulmonary veins
The left ventricle ejects blood to the _______.
The aortic fibrous ring and the atrioventricular fibrous rings are made up of...
right and left fibrous trigones
The right and left atrioventricular valves are made up of...
septal and parietal cusps
The right and left atrioventricular valves are ________ valves.
The aortic valve is made up of...
right, left, and septal semilunar valves
The semilunar cusps of the aortic valve have _________ in the middle of their free borders.
The pulmonary valve is at the junction between the ______ and the _______.
right ventricle; pulmonary trunk
The pulmonary valve consists of...
3 semilunar cusps (right, left, and intermediate)
The sinoatrial node is at the ___________, the semilunar muscular crest at the opening of the right auricle.
The atrioventricular node is ___________ to the ___________ of the right atrioventricular valve.
craniodorsal; septal cusp
The purpose of trabecula septomarginalis is....
provides a shortcut for a bundle of the conducting tissue (atrioventricular bundles), ensuring a simultaneous contraction of all parts of the right ventricle.
The only structure to pass through the lumen of the right ventricle (same in left ventricle).
trabecula septomarginalis with enclosed atrioventricular bundles with conducting fibers
Ligaments that go from the pericardium to the sternum and diaphragm, respectively.