Which muscle inserts into the nasolabial fold?

The muscle that inserts into the nasolabial fold is the levator labii superioris alaeque nasi. This muscle plays a key role in facial expressions, particularly in elevating the upper lip and contributing to the formation of the nasolabial fold, which is the groove extending from the side of the nose to the corners of the mouth.

The levator labii superioris alaeque nasi originates from the frontal process of the maxilla and inserts into the skin of the upper lip and the alae of the nose, directly influencing the nasolabial area. Its function helps accentuate the nasolabial fold, especially during expressions of surprise or disdain.

In contrast, while the orbicularis oris surrounds the mouth and is involved in lip movements, its primary function does not include direct insertion into the nasolabial fold. The risorius, known for pulling the corners of the mouth laterally, does not insert into the nasolabial area either. The buccinator plays a significant role in mastication and maintaining the integrity of the cheek but does not have an anatomical attachment that influences the nasolabial fold directly.

Therefore, the relevance of the levator labii superioris alaeque nasi in establishing the nas