The hypodermis, also known as subcutaneous tissue, connects your skin to your muscles and bones. It's the deepest layer of skin, sitting beneath the dermis. The hypodermis is made up of fat and connective tissue, which help to insulate your body, protect you from harm, and store energy.
While the hypodermis is the primary connection between skin and bone, it's important to note that muscles also play a role. Tendons, which are strong fibrous connective tissues, attach muscles to bones. So, the muscles, through their attachment to bones via tendons, indirectly contribute to the connection between skin and bone.
The connection between skin and bone is essential for movement and stability. It allows your skin to move freely over your muscles and bones, and it helps to protect your body from injury.