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細節
The development of the heart
1. Beginning of the formation of the heart as a simple tube with a contracting lining; the blood-conducting vessels can be seen at the top, the blood-deducting vessels at the bottom of the organ. Magnified 300-fold. 2. The tubular heart bends itself into an S-shape, three distinct swellings become apparent: the truncus arteriosus, the ventricle, and the atrium. 3. The swellings have been further compressed. The atrium has developed two expansions (red); sinus horns have started to grow. 4. The sinus horns have developed more markedly. The atrial canal shows first signs of the separation of the two chambers of the atrium. Magnified 40-fold, from an embryo of five weeks. 5. The sinus horns have grown around the atrial canal, the separation of the chambers is more apparent. Magnified 6-fold, from an embryo of six weeks. 6. The development continues apace. The truncus arteriosus has begun to split into two. Magnified 30-fold, from an embryo of eight weeks. 7. The same heart, opened up. The atria have been removed to show the development of the septum primum. 8. The heart of a slightly older embryo, the truncus arteriosus has completely split, into aorta and pulmonary artery. Magnified 20-fold. 9. The same heart, opened up (from the back). After the septum primum has developed, the septum inferius starts to grow; the black probe goes into the right (venous) half of the heart. 10. The heart of an embryo of three months. Both chambers have been opened to reveal the septum inferius, the Eustachian valve, and the foramen ovale. The pulmonary arteries are still small, since the connection between their channel and that of the aorta still exists. Magnified 8-fold.
1. Beginning of the formation of the heart as a simple tube with a contracting lining; the blood-conducting vessels can be seen at the top, the blood-deducting vessels at the bottom of the organ. Magnified 300-fold. 2. The tubular heart bends itself into an S-shape, three distinct swellings become apparent: the truncus arteriosus, the ventricle, and the atrium. 3. The swellings have been further compressed. The atrium has developed two expansions (red); sinus horns have started to grow. 4. The sinus horns have developed more markedly. The atrial canal shows first signs of the separation of the two chambers of the atrium. Magnified 40-fold, from an embryo of five weeks. 5. The sinus horns have grown around the atrial canal, the separation of the chambers is more apparent. Magnified 6-fold, from an embryo of six weeks. 6. The development continues apace. The truncus arteriosus has begun to split into two. Magnified 30-fold, from an embryo of eight weeks. 7. The same heart, opened up. The atria have been removed to show the development of the septum primum. 8. The heart of a slightly older embryo, the truncus arteriosus has completely split, into aorta and pulmonary artery. Magnified 20-fold. 9. The same heart, opened up (from the back). After the septum primum has developed, the septum inferius starts to grow; the black probe goes into the right (venous) half of the heart. 10. The heart of an embryo of three months. Both chambers have been opened to reveal the septum inferius, the Eustachian valve, and the foramen ovale. The pulmonary arteries are still small, since the connection between their channel and that of the aorta still exists. Magnified 8-fold.
注意事項
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