Rib is an arc-shaped small bone, one end of which is connected with both sides of the spine of the trunk, the wall of the road body is bent towards the development plane, and the other end is in a swimming state or connected with the sternum in the center of the chest. Fish steak The city end is connected with the spine, and the femoral end is free. In higher vertebrates, the ventral ends of ribs are connected to the sternum, which together form a chest pad. Chest pads can not only protect the heart and lungs, but also strengthen the respiratory function.
Extended data
General form of ribs:
The posterior end is slightly enlarged, which is called the costal head. The articular surface forms a joint with the costal recess of the thoracic vertebra. It gradually tapers from the rib head back to the outside, called the rib neck, and then flattens outward to become a rib. The kyphosis at the junction of neck and body is called costal tubercle, and the articular surface is related to the costal recess of transverse process of thoracic vertebra.
The corner where the rib body turns outward to the front is called the rib angle, and the inner surface of the lower edge of the rib body has rib grooves for nerves and blood vessels to pass through. The front end of costal body is rough and connected with costal cartilage, which is hyaline cartilage and related to the lateral edge of sternum.
1 The ribs are short and curved, the head and neck are slightly lower than the body, and the ribs are flat, which can be divided into upper and lower sides and inner and outer edges. On the inner edge of the upper surface, there are anterior scalene muscle nodules formed by the attachment of anterior scalene muscle, and there are shallow grooves before and after the nodules, which are the impressions of subclavian vein and subclavian artery. There is no costal groove below, and the anterior end is directly combined with sternum by costal cartilage.
The second rib ratio 1 rib is slightly longer, which is more similar to the general rib. No. 1 1, 12 ribs have no costal nodules, neck and angle, straight and short body, blunt end, and costal cartilage does not ossify for life.
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