Final answer:
The sliding of the scalp over the cranium is possible through the movement of muscles and connective tissues. The muscles of facial expression, which originate from the scalp musculature, play a role in this movement.
Step-by-step explanation:
The sliding of the scalp over the cranium is possible through the movement of muscles and connective tissues. In the human body, there are muscles attached to the scalp that allow for movement. When these muscles contract and relax, they enable the sliding of the scalp over the cranium.
This allows the skin on the head to move independently of the skull. The muscles of facial expression, which are responsible for allowing us to show emotions through our facial gestures, are unique in that they insert onto the skin instead of the bone, and in some cases, they insert onto the cartilage found around the face.
For example, the muscles of facial expression, which are unique to the muscles of the face, are responsible for various facial movements, including the movement of the scalp. These muscles originate from the scalp musculature and insert onto the cartilage found around the face.