👉 Sphenus is a muscle in the neck of the human body. It is also known as the "sphinx" because it is located at the base of the skull, just above the orbit and below the jugular foramen. The sphenoid bone acts as a bridge between the frontal bone (frontalis) and the temporal bone (transverse). The sphenoid muscle is responsible for moving the eyes to look upward or down when looking to the left or right, respectively.