Left Atrial & Ventricular Chambers
D
isclaimer / Declaration: The study material included in this file and copied from relevant books / other sources are purely intended for the welfare of our medical students during COVID-19 Lockdown andare not for the purpose of publication and general circulation.
aijazahmedkhan7@live.com
Objectives
Recall- External features of left atrium & ventricle - Brief develop. aspect & foetal circulation
Openings in the left atrium
Musculi pectinati…..
Left AV /Bicuspid/mitral opening &
valve
Openings in the left ventricle
Trabeculae carnae
Interventricular septum
Inflow & outflow tract
Aortic valve/Semilunar valve & its cusps
Some applied aspect
Absorption of
pulmonary vein
into left atrium
Left Atrium
Left Atrium – Opened from Middle
Miter
Bishop’s official headdress
Schematic – Cusps & Papillary muscles of mitral valve
A-AP, P-PA
Parts of cusps & attachment sites of chordae tendinae
[Atrial & Ventricular surface]
Appearance of mitral valve from atrium
1:Brachiocephalic Trunk; 2:Superior Vena Cava; 4:Right Auricle; 5:Right Atrium; 6:Aortic Valve;
8:Tricuspid Valve;
9:Papillary Muscles;
10:Myocardium of Right Ventricle;
11:Left Common Carotid Artery;
12:Left Subclavian Artery; 13:Aortic Arch;
14:Ligamentum Arteriosum;
17:Pulmonary Vein;
18:Pulmonary Trunk;
19:Left Auricle;
20:Pulmonic
Semilunar Valve;
21:Papillary Muscles;
22:Myocardium of Left Ventricle;
23:Papillary Muscles;
24:Interventricular Septum;
Ventricular
Chambers
INTERVENTRICULAR SEPTUM
AORTIC VLAVE
[ Semilunar valve]
Semilunar Valves of Aorta
Fibrous Skeleton of the Heart
Skeleton has also intermediate character
Fibrous Skeleton of Heart & its Functions
From epi-to-endocard.
AV orifices to root of great art vessels
B/w contractile & conducting elements
Myocardial Matrix-important, diff. to dissect
Strongest at AV & aortic junction – ‘central fibrous body’ –fibrous trigone – Os cordis
Penetrated by AV bundle
Maintains mechanical cohesion
Provides electrophysiological discontinuity
Gives stable but deformable base for AV valves
Provides attach. for atrial & ventricular musculature-
Impulse Conducting Tissue of Heart
Dev. Defects – CHDs
Stenosis / Atresia
Regurgitation
Valve replacement
Conduction defects
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APPLIED ASPECT
ASD
VSD
TGA
Mitral valve: Stenosis
Mechanical Heart Valves
Complete AV Block “ Heart Block”
LBBB
D
isclaimer / Declaration: The study material included in this file and copied from relevant books / other sources are purely intended for the welfare of our medical students during COVID-19 Lockdown andare not for the purpose of publication and general circulation.
