Rib healing: No real good studies on rib fractures. They can hurt for weeks or longer depending on how bad the fractures are. Usually walking around is good.
Subcutaneous tissue. The subcutaneous tissue, also called the subcutis, hypodermis, hypoderm, subcutis, or superficial fascia, is the lowermost layer of the integumentary system in vertebrates.
Another purpose for the subcutaneous tissue layer is to anchor the other layers of the skin to the muscles beneath the skin. The subcutaneous tissue layer also functions to protect the muscles and bones whenever we fall or hit our bodies on something.