Which artery does not contribute to the frontal flap to the nose?

The superficial temporal artery does not contribute to the frontal flap used in nasal reconstruction. The frontal flap relies mainly on the branches that supply the forehead and nasal area, namely the supratrochlear, supraorbital, and dorsal nasal arteries.

The supratrochlear and supraorbital arteries are direct branches of the ophthalmic artery, which itself is a branch of the internal carotid artery. These arteries are crucial for vascular supply to the forehead region, where a frontal flap is often harvested for nasal reconstruction. The dorsal nasal artery, which is a continuation of the ophthalmic artery as it exits the orbit, also plays an important role in providing vascular supply to the nasal bridge.

In contrast, the superficial temporal artery originates from the external carotid artery and primarily supplies the lateral aspect of the head and scalp. It does not provide blood supply to the region where the frontal flap is designed, making it irrelevant to the flap's perfusion and viability.