Class notes
Internal features of the heart
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Lecture notes of 11 pages for the course Medicine at QUB (Anatomy)
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INTERNAL FEATURESHeart sounds
51 Closure of Mitral tricuspid valves CAV valves
Ventricles contract before the s L
valves open so the pressure balloons
the mitral tricuspid valves pushing
them towards the atria
They are
prevented from inverting into the atria
tendon
by chordae ae tensed
by papillary muscles The sudden
blockage of blood flow S1 Sound
52 Closure of aortic and pulmonary values CSL valves
As the L ventricle empties its
pressure falls below the aortic pressure
so blood falls back towards the L
ventricle This fills the aortic cusps
closing the ventricle The Sound results
from the reverberation within the blood
as it is suddenly blocked The same mechanism happens at
the P2 Sound
pulmonary valve
Auscaltation points for valves
Aortic 2 l CS R para sternal
, Pulmonary 2 ICS L
para sternal
Tricuspid 5th ICS L parasternal
Mitral S th l CS L midclavicular
All People
Take Money
Murmurs
May be caused
by
A Stenosis B Insufficiency
Narrowing of Regurgitation
the valve Caused
by
failure to
c Atresia close fully
without
may be due
perforation to severe stiffening
A
congenital or
prolapse of
defect where the valve the valve leaflets into the
has not formed and is Chamber
Closed off
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