Anatomy books

Tuesday, February 27, 2018

Easy handout of right ventricle of the heart

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. 

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