Ribs 3 - 9 have the following characteristics and are therefore called what type of ribs?
a. Head - articulates with vertebrae of same number plus next highest vertebrae
b. Neck: tapered area just lateral to the head, medial to costal tubercle - superior part called the crest
c. Body: (shaft) most of rib, from neck to its anterior articulation. Has a twist in addition to other landmarks:
i. Costal tubercle - articulates with transverse process of vertebrae of the same number
ii. Costal angle - where shaft turns sharply anteriorly, just lateral to tubercle
iii. Costal groove - inside of lower border – contains v., n., a.