Areolar connective tissue joins -

Areolar tissue is a loose connective tissue, in which the cells and fibres are loosely arranged in a semi-fluid ground substance.
It contains fibroblasts (which produce the fibres), macrophages and mast cells.
It is present beneath the skin, where it joins the integument (skin) with the underlying muscles; it also serves as a support framework for epithelium.
Bones are joined with muscles by tendons, which are dense regular connective tissue.
Bones are joined with bones by ligaments, which are also dense regular connective tissue.
So areolar connective tissue joins the integument with muscles.