Right ventricle of the heart:
The heart consists of four chambers:
·
Right and left atrium both are separated
by interatrial septum
·
Right and left ventricle both are
separated by interventricular septum
Right
ventricle:
The wall of the right ventricle is thicker
than the atrium but it is less thick than the left ventricle.
It contains two orifices
1. Right
atrioventricular orifice: by this orifice deoxygenated blood of right atrium
enters into the right ventricle
2. Pulmonary orifice : by this orifice it sends it deoxygenated blood to the lung
via pulmonary trunk for oxygenation.
Externally it forms most the sternocostal surface
and 1/3 of diaphragmatic surface. It also form inferior border. It is separated
from right atrium by atrioventricular sulcus /groove or coronary sulcus. It
also separated from left ventricle by two groove anterior and posterior
interventricular 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 two part are separated by a muscular ridge
known as supraventricular crest.
The cavity of the right ventricle is crescent shape
in cross section because the
interventricular septum make a bulge toward the right ventricle.
Moderator band: (septomarginal trabeculum)
it is the unique features of the right ventricle , a
thick muscular ridge extending from the ventricular septum to the base of the
anterior papillary muscle. It conveys the right branch of the atrioventricular
bundle (bundle of His) , a part of conducting system of the heart .
function of the moderator band: it prevents the
overdistension of right ventricle.
Trabeculae carneae of right ventricle:
Three types of muscular projections are present in
trabeculae carneae of right ventricle.
They are
1. Ridges
: fixed muscular elevations
2. Bridges
: two ends are fixed with central free portion
3. Papillary
muscles of right ventricle: are three in number : anterior , posterior and
septal.
