Figure 8.

A – Sub-type IIIb of the septomarginal trabecula: a) horizontal cross-section through the lumen of the right ventricle; b) sagittal cross-section through the lumen of the right ventricle. B – Interior of the right ventricle; sub-type IIIb of the septomarginal trabecula (♀, 19^th week of fetal life)

IS – interventricular septum, AW – anterior wall of the right ventricle, ST – septomarginal trabecula, APM – anterior papillary muscle, SC – lower part of the crista supraventricularis, I in black circle – septomarginal trabecula