Typical rib (inferior view) (English)

The fifth rib shown from an inferior view. This perspective allows the appreciation of the costal groove which is traversed by the intercostal vessels and intercostal nerve. The order of these structures from superior to inferior is vein, artery, nerve.The inferior/internal surface of the rib provides the attachment sites for the intercostal muscles. The external and internal intercostal muscles attach to the anterior margin of the groove, while the innermost intercostal muscle attaches to the posterior margin.