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.
The hypodermis is the deepest layer of skin, lying beneath the dermis and epidermis. It is also referred to as subcutaneous tissue. It is designed to conserve energy and is made up of cells that store fat for the body's use.