Zygomaticus Major Muscle, Lateral View

Description

Arcing obliquely across the lateral cheek, the zygomaticus major runs from the zygomatic bone to the modiolus at the angle of the mouth. Its fibers course inferomedially, superficial to the buccinator and lateral to the levator labii superioris, forming a clear vector for elevation and lateral traction of the oral commissure. Along the malar prominence, the muscle sits deep to the subcutaneous fat of the cheek and superficial to the facial mimetic musculature that converges at the perioral region. A clean lateral profile. Functionally, this is the principal smile elevator, and the side view clarifies how contraction lifts the mouth corner toward the zygoma rather than simply retracting it posteriorly. That relationship matters in facial nerve assessment: weakness of zygomatic and buccal branches can flatten the nasolabial fold and reduce excursion of the oral commissure, a classic finding in Bell palsy or after parotid surgery. In aesthetic and reconstructive planning, the zygomaticus major also defines a key surgical plane during midface lifts and informs botulinum toxin placement when treating smile asymmetry, so knowing its superficial course relative to the modiolus and cheek fat pads prevents unintended effects. Use this illustration in head and neck anatomy teaching for facial expression muscles, in clinical skills material covering cranial nerve VII motor testing, or in plastic surgery and dermatology references discussing midface anatomy and perioral landmarks. It also pairs well with modules on the zygomatic bone, modiolus, and nasolabial fold mechanics for communication and emotion research figures. Anatomical accuracy verified by SciePro's Medical Advisory Board.