Ribs/Ribcage

For the formations WAIST + BONE = RIB and BELLY + BONE = RIB, see Chapters 1.4.6 and 1.4.7.
The two roots #553 PTB *s-nam RIB and #297 PTB *s-ni HEART / BREAST / CHEST / RIB are sometimes difficult to distinguish, especially in Lolo-Burmese, but in general it seems that #553 PTB *s-nam RIB is more typical of Burmish, while #297 PTB *s-ni HEART / BREAST / CHEST / RIB is more typical of Loloish.