ANTIQUE VINTAGE 1930 SINGER TREADLE SEWING MACHINE & CABINETUp for sale is this 1930 Singer Treadle Sewing Machine (Model 99-13). It is in good condition, with some wood peeling on the corners and an arm missing from the lower flywheel, though still has its original belt.ebay.com.
{Ribs+Sternum = Rib cage}. Rib cage has 12 pairs of ribs or 24 in number. Ribs are divided in three categories on the basis of their size and their connections with the front side of skeleton. True ribs - First 7 pairs {1â7} of rib bones are called true ribs. They connect strernum {breast bone} with coastal cartilage in the front and to the spine at the back by ligaments. [coastal cartilage is elastic in nature and helps the ribcage to expand during respiration].
Humans have 12 pairs of ribs, which makes a total of 24 ribs altogether. They are classified as true ribs, false ribs and floating ribs; depending on their attachment to the sternum (breastbone). True ribs are the first seven pairs of ribs and get their name from the fact that they are directly connected to the sternum.0 Oct, 2011 how many 0. The ribs are long curved bones that are a part of the human skeleton and form a cage like structure called the ribcage. The ribcage is an important structure the provides protection for the organs, such as the heart and lungs, in the chest cavity (thoracic cavity).