The hypochondrium, also known as the ribs, is located on the side of the chest, referring to the part from the armpit to the twelve bones, the lower chest ribs and costal margins on both sides.

The ribs are small arc-shaped bones with one end connected to both sides of the vertebrae of the trunk, with the body wall curved toward the open surface, and the other end in a free state or connected to the sternum in the center of the chest.

The market end is connected to the vertebrae, and the femoral end is free. In higher vertebrates, the ventral end of the ribs is connected to the sternum, and both legs form the thoracic seat. The chest seat can not only protect the heart and lungs, but also enhance the breathing function.

Extended information:

The main function of the ribs is to support the body wall, protect the internal organs, and assist in breathing in reptiles, birds and mammals.

The sternum is located in the ventral midline of the thoracic region and is a unique structure of terrestrial quadrupeds. The function of the sternum is to support and strengthen the body wall, help protect the chest viscera and provide attachment for the forelimb muscles. In vertebrates above reptiles, the sternum also assists in lung respiration.

The initially formed ribs are cartilage, and later all or part of them ossify into hard bone. The ribs of reptiles and mammals are not ossified at the end of the abdomen where they meet the sternum. Each vertebra generally has a pair of ribs. Usually the ribs in the chest are well developed, while other parts are degenerated. The remnants are often seen on the cervical and sacral vertebrae.

Baidu Encyclopedia - Ribs

Baidu Encyclopedia - Ribs