Ventral View of Developing Heart Day 40 UNSW

Ventral View of Developing Heart – Day 40 UNSW Embryology

Ventral View of Developing Heart – Day 40 Opening of Sinus Venosus Primordial Right Atrium Primordial Right Ventricle Primordial Left Atrium Fused Dorsal and Ventral Endocardial Cushions Primordial Left Ventricle

Growth of the Septum Primum

Growth of the Septum Primum Foramen Primum

Growth of the Septum Primum Foramen Primum Myocardium differentiated from splanchnic mesenchyme near the venous pole

Growth of the Septum Primum Foramen Primum

Growth of the Septum Primum Foramen Primum Originates from left sided mesenchyme from the original cardiogenic fields

Perforation of the Septum Primum

Perforation of the Septum Primum Growth of the Ventricular Septum

Perforation of the Septum Primum Growth of the Ventricular Septum Valve of the Sinus Venosus Openings of the pulmonary veins Ventricular Septum

Growth of the Ventricular Septum Early studies believed that the ventricular septum formed from coalescence of trabeculae of the primordial ventricle Ventricular Septum

Growth of the Ventricular Septum

Growth of the Ventricular Septum Later studies have suggested that the muscular septum originates from fusion of the external R and L ventricular walls as the ventricles grow Ventricular Septum

Growth of the Septum Secundum

Growth of the Septum Secundum Ventricular Trabeculation

Growth of the Septum Secundum Ventricular Trabeculation Septum Secundum Foramen Ovale Foramen Secundum

Growth of the Septum Secundum Forms as a superior interarterial fold

Growth of the Septum Secundum

Growth of the Septum Secundum Also originates from left sided mesenchyme from the original cardiogenic fields

Ventricular Trabeculation

Ventricular Trabeculation Trabeculae