The human brain. They had no idea what its function was. As far as they knew, it was just stuff to fill the cavity of the skull. During mummification it was removed through an opening cut through the nostrils and discarded.
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The egyptians thought the heart was used for thinking and was the most important organ in the body. It was the only organ which was not removed from mummies. They did not know what the brain was for. They thought it was useless, so it was taken away from mummies. They thought that only the heart was necesary for the afterlife.
The earliest Canopic jars were simple, and carved from stone or formed with clay[pottery] with flat lids. In later periods the jars became more elaborate, and carved from either Calcite[Egyptian Alabaster] or Granite.The most common forms were 4 jars held within a chest, the chest also being carved from soft stone. These represent some of the most beautiful and elaborate artwork of Ancient Egypt.
Ancient Egyptians did not think that the brain was important. They thought that it was only to take up space in their head. The heart however, was recognised to be of importance. When they were mummified it was also wrapped and placed back in the body.
free reed organ
it was used for the brain and the lungs and the liver ..