QS Study

The right ventricle is the crescent-shaped chamber of the heart, which receives blood from the right atrium & propels it during systole through the pulmonary trunk & pulmonary arteries to the lungs. It is the chamber within the heart that is responsible for pumping oxygen-depleted blood to the lungs.

It is located in the lower right portion of the heart below the right atrium and opposite the left ventricle. It receives deoxygenated blood from the right atrium and pumps it under low pressure into the lungs via the pulmonary artery.

Contributions

It contributes to the formation of:

  1. Inferior border of the heart.
  2. A large part of the sternocostal surface.
  3. A small part of the diaphragmatic surface of the heart.

Fig: Interior of the right ventricle

Features

(1) Right ventricle has two surfaces:

  1. Anterior or sternocostal surface.
  2. Inferior or diaphragmatic surface.

(2) The interior of the right ventricle has two pans:

  1. Inflowing or rough part and,
  2. Outflowing or smooth part.

These two parts are separated by an infundibuloventricular or supraventricular crest, situated in between the tricuspid & pulmonary orifices.

The rough part is rough due to the presence of trabeculae carnae. They are of 3 types –

i) Bridges,

ii) Ridges and

iii) Pillars/papillary muscles.

Papillary muscles are attached to the ventricular walls by their roots. Their apices are connected to the cusps of the tricuspid valve by chordae tendinae.

The smooth part is funnel-shaped & gives rise to pulmonary trunk – also known as infundibulum.

Thickness: It is thinner than the wall of the left ventricle in a ratio of 1:3.

Development of right ventricle

  • Rough part: From right portion of the primitive ventricle.
  • Smooth part: From proximal part of bulbus cordis.
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