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Fetal pig being dissected, showing the thoracic cavity, including the rib cage, the heart in the pericardium, the lungs, the diaphragm, part of the liver, and all the organs under the neck. The size of the fetal pig depends on the time allowed for the mother to gestate:
In adults, the ligamentum arteriosum has no useful function. It is a vestige of the ductus arteriosus, a temporary fetal structure that shunts blood from the pulmonary arteries to the aorta. This significantly reduces the volume of blood circulating through the lungs, which are inactive in the womb.
Microscopic section through a small portal vein branch inside the liver (×250 magnified) The portal venous system is responsible for directing blood from parts of the gastrointestinal tract to the liver. Substances absorbed in the small intestine travel first to the liver for processing before continuing to the heart.
The fully aquatic Bornean flat-headed frog (Barbourula kalimantanensis) is the first frog known to lack lungs entirely. [72] Frogs have three-chambered hearts, a feature they share with lizards. Oxygenated blood from the lungs and de-oxygenated blood from the respiring tissues enter the heart through separate atria.
1905 diagram of the internal organs of human body. In the study of anatomy, viscera (sg.: viscus) refers to the internal organs of the abdominal, thoracic, and pelvic cavities. [5] The abdominal organs may be classified as solid organs or hollow organs. The solid organs are the liver, pancreas, spleen, kidneys, and adrenal glands.
The diaphragmatic surface of the liver that is in direct contact with the diaphragm (just beyond the peritoneal reflections) has no peritoneal covering, and is termed the bare area of the liver. The anterior layer of the coronary ligament is formed by the reflection [ clarification needed ] of the peritoneum from the upper margin of the bare ...
The human hepatic portal system delivers about three-fourths of the blood going to the liver.The final common pathway for transport of venous blood from spleen, pancreas, gallbladder and the abdominal portion of the gastrointestinal tract [2] (with the exception of the inferior part of the anal canal and sigmoid colon) is through the hepatic portal vein.
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