Supraorbital nerve
The supraorbital and supratrochlear nerves arise from the frontal nerve and are 2 of the 5 branches of V1 (ophthalmic division of the trigeminal nerve). The supraorbital nerve is the largest branch. It exits the orbit through the supraorbital notch or foramen, usually within the medial third of the orbital roof (mean distance from exit to medial angle of the orbit: 20 mm (range: 5–47) 1)). The supratrochlear nerve exits the orbit without a foramen or notch 3–38 mm medial to the supraorbital nerve (mean: 15.3 mm 2)); the most medial branch varies from 8–30 mm lateral to the patient’s midline 3))
The supraorbital nerve passes through the supraorbital foramen, and gives off, in this situation, palpebral filaments to the upper eyelid. Additionally, it supplies the conjunctiva of the eye, the frontal sinus, and the skin from the forehead extending back to the middle of the scalp.
The supraorbital nerve frequently constitutes the lateral landmark of the frontal sinus, consequently keeping lateral to it, avoids entering the sinus cavity. However, there are several variants that have to be considered.