Atypical ribs - R1,2,10,11,12
a. Rib 1: no twist to its body, single facet on head, scalene tubercle, grooves for subclavian vessels, broadest and most curved, flat and short
b. Rib 2: tuberosities for scalene mm. and serratus anterior mm.
c. Rib 10: articulates only with vertebrae 10
d. Ribs 11,12: small costal cartilage, single facet on the head, no neck or tubercle-thin cartilage, no costal groove
Rib 1 depicted. Go on to next page.