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What is Modiolus at the cortex of mouth is formed by all except? and explain in detail?
Modiolus is a chiasma of facial muscles held together by fibrous tissue located superolateral to each angle of mouth.
It is formed by 8 muscles,

Orbicularis oris
Buccinator
Levator anguli oris
Depressor anguli oris
Levator labii superioris
Zygomaticus major
Risorius
Platysma