Flashcards in Middle mediastinum - heart - septum, valves and great vessels (dave's notes) Deck (12):
The inter ventricular septum spans from one side to the other. What is it attached to?
The fibrous skeleton, by the membranous part of the septum
Describe the general structure of the mitral and tricuspid valves. What do they require to maintain integrity?
MV and TV have free edges with a serrated outline, integrity requires active contraction of the chord tendinae
Describe the general structure of the pulmonary and aortic valves. What do their require for integrity?
The PV and AV have a free edge containing a fibrous nodule, with integrity being passive.
What are the valves composed of?
Fibrous tissue with much elastic fibre, and are covered with vascular endothelium
What is a general surface marking for ALL of the heart valves?
All lie behind the sternum, with a line in the vertical plane. Tricuspid-mitral-aortic-pulmonary
What are the surface markings for the tricuspid valve?
Right 5th intercostal space
What are the surface marlins for the mitral valve?
What are the surface markings for the aortic valve?
Right second intercostal space
What are the surface markings for the pulmonary valve?
Left second intercostal space
Describe the ascending aorta
5cm in length, gives off the aortic sinuses, then runs to the right of the pulmonary trunk, spiralling as it does so
What do the ascending aorta and pulmonary trunk share?
A common sleeve of pericardium, sitting in front of the transverse sinus