Regarding attachments to the thoracic cage:

• A. pectoralis major has slips of origin from the upper 8 costal cartilages
• B. the first digitation of serratus anterior attaches to the 1st and 2nd rib
• C. rectus abdominus is attached to the anterior surfaces of the 7th to 10th costal cartilages
• D. iliocostalis and longissimus, parts of erector spinae, are attached between the heads and tubercles of each rib
• E. serratus anterior is attached to the lower 8 ribs