|A central rib of the left side. Inferior aspect. (Tubercle labeled at upper right.)|
|A central rib of the left side, viewed from behind. (Tubercle labeled at center.)|
|Gray's||subject #28 124|
It consists of an articular and a non-articular portion.
- The articular portion, the lower and more medial of the two, presents a small, oval surface for articulation with the end of the transverse process of the lower of the two vertebrae to which the head is connected.
- The non-articular portion is a rough elevation, and affords attachment to the ligament of the tubercle. The tubercle is much more prominent in the upper than in the lower ribs.