PATHOLOGY

Detailed explanation-1: -The upper eyelid gets most of its blood supply from the internal carotid artery. Blood flows from the internal carotid artery to the ophthalmic artery to the superior marginal arcade that traverses the lid just superior to the upper eyelid margin posterior to the orbicularis muscle and anterior to the tarsal plate.

Detailed explanation-2: -The superficial temporal artery arises from the external carotid artery. It runs along the posterior margin of the condylar process of mandible, and crosses the posterior root of the zygomatic process of the temporal bone. 1), 9) Above the zygomatic arch, it divides into 2 large terminal branches.

Detailed explanation-3: -The branches of the ophthalmic artery-dorsal nasal artery, supratrochlear artery, and supraorbital artery-are responsible for the nutrition of the forehead. These arteries are connected with those lying next to them. Additionally, they all anastomose with the frontal branch of the superficial temporal artery.