Which structure does the levator labii superioris alaeque nasi insert into?

The levator labii superioris alaeque nasi is a facial muscle that primarily functions to elevate the upper lip and contribute to the formation of the nasal flare. This muscle has two parts: one that elevates the upper lip and another that elevates the ala of the nose.

The correct insertion of the levator labii superioris alaeque nasi is into the medial aspect of the nasolabial fold. This structure is located between the upper lip and the nose, and the muscle contributes to creating expressions such as disdain or sadness. By inserting into the nasolabial fold, this muscle can effectively pull the upper lip upward and outward, thus influencing facial expressions and movements in that area.

The other answer choices refer to structures that do not accurately represent the primary insertion of this muscle. The upper lip is too broad and general, the lateral nasal cartilage is not the specific target for this muscle's action, and the lower lip is not involved at all. Understanding the correct insertion point helps to appreciate the muscle's role in facial movement and expression in oral and maxillofacial contexts.