left
ventricle:
The wall of the left ventricle is thicker than
the atrium and also it is thicker than
the right ventricle.
It contains two orifices
1. Left atrioventricular orifice: by this orifice
oxygenated blood of left atrium enters into the left ventricle
2. aortic orifice : by this orifice it sends it oxygenated
blood to whole body via aorta.
Externally it forms some part of the sternocostal surface and 2/3 of
diaphragmatic surface. It also form apex, left border. It is separated from
left atrium by atrioventricular sulcus /groove or coronary sulcus. It also
separated from right ventricle by two groove anterior and posterior inter-ventricular
groove.
Internally it has two part inflowing rough part due
to trabeculae carneae ( muscular ridges of the heart ) and outflowing smooth
part also known as infundibulum.
The cavity of the left ventricle is circular shape
in cross section because the interventricular septum makes a bulge toward the
right ventricle.
Trabeculae carneae of ventricles:
Three types of muscular projections are present in
trabeculae carneae of left ventricle.
They are
1. Ridges
: fixed muscular elevations
2. Bridges
: two ends are fixed with central free portion
3. Papillary
muscles : in left ventricle it is two in number : anterior and posterior
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