Final answer:
The superficial fascia fuses with the underlying fascia of bones and muscles, intertwining with tendons that can attach to the periosteum of bones or form aponeuroses in certain areas.
Step-by-step explanation:
The superficial fascia, also known as the hypodermis or subcutaneous layer, fuses with several structures depending on its location in the body. It primarily connects the skin to the underlying fascia of the bones and muscles. When discussing muscle anatomy, the collagen of the superficial fascia can intertwine with the collagen of tendons. These tendons, in turn, can fuse with the periosteum that coats the bones.
In some areas like the lower back, the superficial fascia or the mysia of muscles like the latissimus dorsi may fuse into broad, tendon-like sheets known as aponeuroses.
The superficial fascia is made up of loose, areolar connective tissue and adipose tissue, which functions as a mode of fat storage and provides insulation and cushioning for the skin.