Published on July 4, 2016
1. Septation of human heart Starts from week 6 to week 42
2. Week 4 (28 days) In week 4 the heart is not yet septated, the atria are having a single chamber The ventricles are a single chambered cavity The bumps on the AV canal are EC cushions The sino atrial orifice is his one on the sinus venosus The ventricles have carneal v trabeculations v
3. Next week • The AV cushions appear more pushed into the center giving the embryonic heart two valves • Septum primum begins to form at 5 weeks, as a crescent shaped thin membranous appearance • The ventricles have a septum • By the end of week 5 the heart forms 4 chambers
4. Day 30 At day 30 the AV cushion get furtherly pushed and enlarge under size This makes the embryonic heart giving it a good circulation process The septum primum becomes apparent and is a thin membranous lid found in the heart’s two atria By the end of week 5 the presumptive secundum is apparent
5. Day 34 By day 35 the heart gives the blood flow different now. It has joined AV cushions which they form the mitral and tricuspid valve The trabeculae of the ventricles becomes rougher as h the blood it flows The foramen secundum is formed in septum primum
6. Day 38 By week 6 the heart accompanies the respiratory system is formed. You The Pulmonary vessels connecting to the lungs are formed but not yet able to circulate The heart is composed of 4 chambers, left at, right at, right vent, and left vent The mitral valves is the one on the left in the right has three cusps The septum secundum forms and all the remains of the primary septum formal foramen is gone The ventricular septum grows further and little as next 2 days, it forms the papillary muscles due to circulating blood
7. 7 weeks In week 7 the chambers that erode with blood forms the papillary muscles, pectinate muscles form in atria Due to growth of blood inside the baby’s body is it once believed to be fetal circulation Foramen secundum is formed in the atria and primary septum has reduced to a lid that flows with blood when it’s moving By the end of week 7 the heart is fully septated except foramen ovale, is open
8. Fetus In 8 weeks or more a baby did not flow its blood to its lungs, but that is underway The flow of blood is changed, And the heart produces systole, and dystole. The Heart pumps blood into the lungs once the baby is born, and the placenta grows thicker as it grows In 2 months it is ready when most cases heart beats are distinct in late foetuses The mitral valves are thin layer of tissue which continues pump blood into the atrium until it reaches the aorta The tricuspid valves floo flu flow blood to the ventricles into the vena cava But those meanings are confused In the interior of ventricles strands of tissue connect the valves to the muscles that look like papillae allow the heart to move This makes the heart becoming larger and smaller In 9 months the full term heart has closed the foramen ovale to a depression caley called fossa ovalis At adults when exercised the heart beats faster
9. Full term heart In late term the umbilical cord is often supplied with two arteries and one vein In the post natal period the operators cut the umbilical cord when the baby is born In this stage the nerves of the umbilical cord are pain free and does not exist When its cut
human heart development •heart tube formation •cardiac looping •chamber septation •valve and outflow formation
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