Development of heart cvs anatomy
- 2. Heart develops from ANGIOBLASTIC tissue from SPLANCHNO PLEURIC MESODERM K/a CARDIOGENIC AREA. Heart lies ventral to FOREGUT and dorsal to Pericardial Cavity.
- 3. Cardiogenic Area and the Pericardial Cavity are in front of the Buccopharyngeal Membrane. C. 21 days. D. 22 days.
- 4. The developing Endocardial Heart Tube and its investing layer bulge into the Pericardial Cavity.
- 5. FUSION OF HEART TUBES
- 6. Two heart tubes fuses from Cranially – Caudal Series of dilatation is seen: Truncus Arteriosus Bulbous Cordis Ventricle Atrium Sinus Venosus Atrium and Ventricle connected by Atrio -Ventricular Canal.
- 10. Series of dilatation is seen after Fusion of Heart Tubes.
- 11. Formation of the Cardiac loop in Pericardial Cavity. The primitive ventricle is moving ventrally to right while the atrial region is moving dorsally to left.
- 12. Heart 28 days. The bulbus cordis is divided into the truncus arteriosus, conus cordis, and trabeculated part of the right ventricle. Broken line, pericardium.
- 13. Fusion near sinus venosus is partial so Right and Left Horns are formed. 1 Vitelline Vein from Yolk sac, 1 Umbilical vein from placenta , 1 from common cardinal vein from body wall joins SINUS VENOSUS.
- 14. Right Horn of SINUS VENOSUS absorbed in COMMON ATRIAL CHAMBER and form Right Atrium. So Right Cardinal vein= Terminal part of SUPERIOR VENACAVA Right Vitelline Vein= Terminal part of IVC LEFT HORN of sinus venosus form part of CORONARY SINUS. All open in the Right Atrium
- 16. Development of the Sinus Venosus at 24 days (A) and 35 days (B). Broken line, the entrance of the Sinus Venosus into the Atrial Cavity.
- 17. SEPTUM PRIMUM: Septum arises from roof of atrial chamber towards Atrio- Ventricluar Canal. The lower edge of Septum primum seperated to form FORAMEN PRIMUM. Atrio Ventricular growth occurs and fuses with SEPTUM PRIMUM. Before this closure, of Foramen Primum, the upper part of septum primum breaks and form FORAMEN SECUNDUM. At this stage the left atrium receives blood form right atrium.
- 19. A. 5 weeks. B. Fetal stage.
- 20. SEPTUM SECUNDUM arises from roof of atrial chamber between septum spurium and septum primum. Grows and overlaps Foramen Secundum. Right and left atrium communicates thro’ FORAMEN OVALE. Lower ends of septum secundum/ Crista Dividens is thick and firm. While the edge of septum primum which formed the lower boundary of foramen secundum is thin and mobile as a flap.
- 22. After birth left atrium begins to receive blood from lungs and pressure within this chamber increases than right. This causes the closure of Foramen Ovale.
- 23. After the formation of Inter atrial Septum, Sinus Venosus is absorbed into Right Atrium. Sinu- Atrial Orifice: Margin of this orifice is bounded by distinct lips= Right and left Venosus Valves. The upper end of two valves fuses to form Septum Spurium. The left valve and septum spurium fuses with Interatrial septum. The right venous valve stretched out, and form 2 muscular bands= Superior and Inferior Limbic Bands.
- 24. A. 5 weeks. B. Fetal stage.
- 26. These 3 Parts form: Crista Terminalis The valve of Inferior venacava Valve of coronary sinus
- 27. Formation of Inter-Ventricular Septum Conus merges within the cavity of Primitive Ventricle & bulbo- ventricular sulcus disappears. The bulbo-Ventricular Cavity contains: Lower Dilated Part- formed by Primitive Ventricle Upper Conical Part- formed by Conus
- 28. Parts of A-V Chamber
- 29. The Cavity is divided as such that: Each half communicates with corresponding Atrium Right Ventricle opens onto Pulmonary Trunk and left Ventricle opens onto Aorta.
- 30. A septum- Interventricular septum grows upward form the floor of bulbo-ventricular cavity Divides the lower dilated part into right and left half. It partially fuses with the Atrio- Ventricular Cushions/ Septum Intermedium.
- 31. Right and left bulbar ridges arise in the wall of the conical upper part of the Bulbo-Ventricular Cavity. This is continuous with the right and left endocardial cushions that separate the Aortic and Pulmonary openings. This ridges together form Bulbar Septum. Bulbar Septum grow towards Inter-Ventricular Septum but leave a gap b/w them.
- 32. • This gap is filled by the proliferation of AV Cushions. • The membranous part of Inter Ventricular Septum divided into: Anterior part Posterior part Anterior part is derived from proliferation of Endocardial Cushions.
- 33. The membranous part of Inter Ventricular
- 34. Anterior Part: Seperates Ventricles Posterior Part: Seperates left ventricle from right Atrium Inter atrial and interventricular septa don’t meet the AV Cushions in same line.
- 35. Spiral Septum appears with in the Truncus arteriosus and divides into Ascending Aorta and Pulmonary Trunk. Right and left Truncus swelling/ Cushions appears and fusion occurs in such that Pulmonary trunk lies ventral to Aorta. Pulmonary and Aortic Valves are formed by the Endocardal Cushions in Truncus Arteriosus and Conus.
- 36. Right and left Truncus swelling/ Cushions appears and fusion occurs in such that Pulmonary trunk lies ventral to Aorta. Pulmonary and Aortic Valves are formed by the Endocardal Cushions in Truncus Arteriosus and Conus.
- 38. Formation of Pulmonary Veins While Septum Primum forming, a single Pulmonary Vein opens into left half of ATRIUM. Divides into right and left half again bifurcates to drain corresponding lung bud. Soon they are absorbed into the Atrium two from each side open into ATRIUM.
- 39. Atrial septa at various stages C. 33 days D. 33 days E. 37 days F. Newborn. G. New born
- 40. Developmental Anamolies in Heart:
- 42. Main intraembryonic and extraembryonic arteries (red) and veins (blue) in a 4- mm embryo (end of the fourth week). Only the vessels on the left side of the embryo are shown