Final answer:
The supraorbital margin is the upper edge of the anterior orbit that includes a foramen allowing sensory nerves to supply the forehead's skin.
Step-by-step explanation:
The supraorbital margin is the upper margin of the anterior orbit, essentially the bony edge above the eye sockets on the skull. This margin forms part of the frontal bone and serves as a critical structure for the attachment of facial tissues and protection of the eyeball. Near the midpoint of the supraorbital margin, you will find the supraorbital foramen, a small opening through which a sensory nerve exits to supply the forehead's skin with sensation. This nerve is a branch of the trigeminal nerve, which is responsible for sensation in the face. Below the orbit, the infraorbital foramen is found; it is another important foramen through which a different branch of the trigeminal nerve passes to provide sensation to the anterior face below the orbit.