According to Ross and Wilson Anatomy and Physiology, 2 pairs
The ribs articulate posteriorly with the vertebrae at costal facets.Bethany S. Fl.
An abdominal rib is a riblike structure which crosses a lizard's abdomen.
A rib is part of the wing structure which gives the wing its shape and strength.
The anatomical structure located directly below the 7th rib is the 7th intercostal space. The intercostal spaces are the spaces between adjacent ribs, with each space being numbered according to the rib above it. In this case, the 7th intercostal space is located below the 7th rib and above the 8th rib.
to proctect rib
The arms are lateral to the ribs.
The simplest answer is because the 11th and 12th ribs (the last two) don't articulate with the transverse process of their corresponding vertebrae. Thus, transverse coastal facets are not needed.
the rib cage
headThe pedicle of the rib articulates with the transverse process of the thoracic vertebra.
Your Skull, Rib Cage and Skin.
There are 12 pairs of ribs that articulate with the thoracic vertebrae, one per vertebra. The upper 7 pairs of ribs articulate directly with the sternum, either via their own costal cartilage or the cartilage of the rib above. Ribs 8-10 articulate indirectly with the sternum through a shared cartilage, while ribs 11 and 12 are floating ribs that do not connect to the sternum.