A structure marked with a red arrow is derived from which of the following ?: (A) Bulbous venosus, (B) Septum primum, (C) Endocardial cushion, (D) Left venous valve
Answer is C. A structure marked with a red arrow is derived from endocardial cushion Structures derived from endocardial cushion are : Atrial septum Membranous pa of ventricular septum Atrioventricular canal, valves Aoo-pulmonary channels Any endocardial cushion defect = Cardiac malformation