Middle mediastinum - heart - The atria and ventricles (dave's notes) Flashcards
Describe the upper end of the right atrium. Where is this found?
The upper end is prolonged as the right auricle. This overlies the commencement of the aorta.
Describe the interior of the right atrium
Smooth to the right of the crista terminals, but rough on the left due to pectinate muscle
What opens into the right atrium? What protects this?
The IVC (???and SVC??). This is protected by a ridge extending up to the coronary sinus.
What is the posterior wall of the right atrium form?
What is found here?
Forms the intertribal septum above the coronary sinus. Here is the fossa ovalis
Where is the right ventricle found relative to the right atrium?
It lies to the left, and is separated by the AP AV groove
What does the AP AV groove contain?
I think the RCA
Describe the surface of the walls of the right ventricle.
The walls are thrown into numerous muscular ridges (trabeculae carneae), and form the moderator band and papillary muscles
What valve lies between the right atrium and right ventricle?
The tricuspid valve
Describe the cusps of the tricuspid valve
Anterior, posterior and septal cusps, attached to the AV ring. The posterior cusp is smaller. Give off chord tendineae to the edges of the ventricular surfaces
What happens to the right ventricle wall as it funnels up to the pulmonary orifice?
The walls thin on their way to the pulmonary valve.
Describe the pulmonary valve cusps and its plane
A horizontal plane, higher than the aortic orifice. Anterior, left and right cusps.
What surface of the heart does the left atrium form?
The posterior surface, with a small auricle projecting upwards
What enters the left atrium?
Four pulmonary veins enter symmetrically . Behind these is the oblique sinus.
Describe the internal cavity of the left atrium
Smooth walled except from the auricle
Describe the mitral valve
Bicuspid, with anterior and posterior valves. These are smaller and thicker than the tricuspid. Anterior is thicker than posterior
