The second rib

Rib

In vertebrate anatomy, ribs are the long curved bones which form the rib cage. In most vertebrates, ribs surround the chest, enabling the lungs to expand and thus facilitate breathing by expanding the chest cavity. They serve to protect the lungs, heart, and other internal organs of the thorax...

is much longer than the first, but has a very similar curvature.

The non-articular portion of the tubercle is occasionally only feebly marked.

The angle is slight, and situated close to the tubercle.

The body is not twisted, so that both ends touch any plane surface upon which it may be laid; but there is a bend, with its convexity upward, similar to, though smaller than that found in the first rib.

The body is not flattened horizontally like that of the first rib.

Its external surface is convex, and looks upward and a little outward; near the middle of it is a rough eminence for the origin of the lower part of the first and the whole of the second digitation of the Serratus anterior; behind and above this is attached the Scalenus posterior

Scalenus posterior

The Scalenus posterior , the smallest and most deeply seated of the three Scaleni, arises, by two or three separate tendons, from the posterior tubercles of the transverse processes of the lower two or three cervical vertebræ, and is inserted by a thin tendon into the outer surface of the second...

.

The internal surface, smooth, and concave, is directed downward and a little inward: on its posterior part there is a short costal groove.