The zygomaticus major muscle (also significant zygomatic muscle or sindicate zygomaticus major, latin: musculus zygomaticus major) is a paired facial muscle that extends between the zygomatic bone and also the corner of the mouth. It is among the two zygomatic muscles (major and minor) that lie next to each other in the cheek location. An activated zygomaticus major muscle is connected in producing an expression in the humale confront recognized as a smile.

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The zygomaticus major may be connected in the development of cheek dimples in some individuals. Before inserting into connective tproblem of the mouth edge, zygomaticus major deserve to periodically divide right into 2 main fibre bundles – a premium bundle, which inserts slightly lateral and also superior of the angle of the mouth, and also an inferior bundle, which inserts slightly lateral and inferior to the angle of the mouth. In several cadaver dissections, the inferior bundle of the zygomaticus major has been oboffered to have an attachment alengthy its middle percentage. Some researchers think that as soon as an individual via this anatomical attribute smiles, tractivity on the skin may produce a dimple in the cheek.

Origin

The zygomaticus major arises from the zygomatic arch. Its beginning site is on the zygomatic bone, just in front of the zygomaticotempdental suture.

Insertion

The zygomaticus significant inserts into the skin of the angle of the mouth, blfinishing through fibers of levator anguli oris, orbicularis oris and also even more deeply put muscular fibers.

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Action

The major activity offered by the zygomaticus major is to lift the angle of the mouth upwards and also laterally. Contractions of this muscle create facial expression of pleasure or laughter.

Innervation

The nerve supply of the zygomaticus major is got from the zygomatic and buccal branches of the facial nerve (CN VII).

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Blood supply

The zygomaticus major is gave with arterial blood by the facial artery and its premium labial branch.