Muscles of facial expression action innervation

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The facial muscles are a group of striated skeletal muscles supplied by the facial nerve cranial nerve VII that, among other things, control facial expression. These muscles are also called mimetic muscles. The facial muscles are just under the skin subcutaneous muscles that control facial expression. They generally originate from the surface of the skull bone rarely the fascia , and insert on the skin of the face. When they contract, the skin moves.
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Muscles of Facial Expression | Anatomy | Geeky Medics

The muscles of facial expression are derivatives of the 2nd pharyngeal arch and are innervated by facial nerve CN VII [1]. These muscles originate from bone or fascia and insert on skin to provide the movements of facial expression. The muscles of facial expression are enclosed by, or form part of, the superficial musculo-aponeurotic system SMAS. The orbital group consists of the orbicularis oculi 3 portions , depressor supercilii, and corrugator supercilii oblique and transverse heads. These muscles provide movement of the eyelid, eyebrow, and periorbital skin and are innervated by branches of the facial nerve [1]. The oral group consists of the orbicularis oris, depressor anguli oris, levator anguli oris, zygomaticus major, zygomaticus minor, levator labii superioris, levator labii superioris alaeque nasi, risorius, depressor labii inferioris, mentalis, and buccinator. These muscles provide movement of the lips and are innervated by branches of the facial nerve [1].
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Muscles of Facial Expression

The muscles of facial expression are located in the subcutaneous tissue , originating from bone or fascia, and inserting onto the skin. By contracting, the muscles pull on the skin and exert their effects. They are the only group of muscles that insert into skin. These muscles have a common embryonic origin — the 2nd pharyngeal arch. They migrate from the arch, taking their nerve supply with them.
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