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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.)
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.
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