Cryptomenorrhea or cryptomenorrhoea, also known as hematocolpos, is a condition where menstruation occurs but is not visible due to an obstruction of the outflow tract.

The cardiac outflow tract is a temporary structure in a developing embryo that connects the ventricles with the aortic sac.

FGF8 transcription factors are essential for regulating the addition of secondary heart field cells into the cardiac outflow tract.

Many were concentrated in the outflow tract, and some were found in the ventricular myocardium.

Internal orifices include the orifices of the outflow tracts of the heart, between the heart valves.

Unoxygenated blood from the right ventricle flows into the aorta preferentially because of the obstructed outflow tract into the lungs.

Radiographs of the chest showed enlargement of the right heart with prominence of the pulmonary outflow tract.

The outflow tract is derived from the secondary heart field, during cardiogenesis.

Right ventricular hypertrophy develops progressively from resistance to blood flow through the right ventricular outflow tract.

It is also involved in the development of the ventricular wall and the connection of the outflow tract to the great vessels.