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Lab 7: Vertebrate Anatomy: Difference between revisions
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→Circulatory System Adaptations for Oxygenation in the Fetus
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Follow the umbilical vein, transected earlier in the dissection, as it seems to disappear in the liver. In Figure 7.5 there is a portion of the vein labeled <u> ductus venosus</U>, that is shunting about ½ the oxygenated blood directly to the vena cava and thus to the fetal heart. After birth the umbilical vein and umbilical arteries atrophy and the ductus venosus gradually fills with connective tissue and closes (ligamentum venosum). This is one of '''three modifications''' to the fetal circulatory system. <BR><BR> | Follow the umbilical vein, transected earlier in the dissection, as it seems to disappear in the liver. In Figure 7.5 there is a portion of the vein labeled <u> ductus venosus</U>, that is shunting about ½ the oxygenated blood directly to the vena cava and thus to the fetal heart. After birth the umbilical vein and umbilical arteries atrophy and the ductus venosus gradually fills with connective tissue and closes (ligamentum venosum). This is one of '''three modifications''' to the fetal circulatory system. <BR><BR> | ||
Because the lungs are not functioning in the fetus, two modifications to the circulation are found within the heart: The <u>ductus arteriosus</u> and the <u>foramen ovale</u>. We will look at these two modifications more closely when dissecting the calf heart.<BR> | |||
Link to a [[Media: FetalPigCirculation.docx | downloadable version]] of Fig. 7.5 labeled: [[Image:FetalPigCirculation.docx]] <BR> | Link to a [[Media: FetalPigCirculation.docx | downloadable version]] of Fig. 7.5 labeled: [[Image:FetalPigCirculation.docx]] <BR> | ||
