The facial artery and its simultaneous vein run between the buccinator and zygomaticus major muscles. Zygomaticus major muscles courses diagonally over the anterior surfaces of the buccinator and also masseter muscles. It is not entirely clear which muscles precisely attach to the modiolus, but specific ones include depressor anguli oris, buccinator, risorius, zygomaticus major, and orbicularis oris muscles. Zygomaticus major inserted interlaces with other muscles that congregate towards the angle of the mouth, forming a dense, mobile, fibromuscular mass called the modiolus. This extension point is located sideways to the zygomaticus minor and medial to the risorius muscles. It runs inferomedially over the lateral surface of the maxilla to insert to the angle of the mouth. The zygomaticus major muscles originate from the lateral surface of the zygomatic bone, slightly anterior to the zygomaticotemporal suture and lateral to the origin of the zygomaticus minor muscle. Along with risorius, the zygomaticus major muscle contributes to laughing, which is why they are regarded as the “laughing muscles”. In coordination with other buccolabial muscles, it encourages speech and creates facial expressions. The primary movement of the zygomaticus major is to pull the angle of the mouth superolateral. These muscles form the structure and take out the functions of the cheeks and lips. It belongs to the buccolabial group of these facial muscles also along with levator labii superioris alaeque nasi, levator labii superioris, zygomaticus major, zygomaticus minor, levator anguli oris, risorius, depressor labii inferioris, depressor anguli oris, mentalis, orbicularis oris, incisivus superior and inferior and the buccinator muscles. Zygomaticus major muscle is a thin pair of facial muscles that lengthens diagonally from the zygomatic bone (hence the name) to the tip of the mouth. The bifid zygomaticus major muscle is a considerable variant and may cause cheek dimples. It is a muscle of facial expression which marks the angle of the mouth superiorly and also posteriorly to allow one to smile. It extends from each of the zygomatic arch (cheekbone) to the corners of the mouth. The zygomaticus major muscle is also a muscle of the human body. What happens if the zygomaticus muscle is damaged?.What is the zygomaticus major muscle used for?.What is the function of the zygomaticus major?.
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