Orbicularis Oris
Head & Face
The 'kissing muscle.' It's actually a complex sphincter, not a simple ring.
Function
Closes and protrudes lips — kissing, whistling
Origin
Maxilla, mandible, and deep surface of perioral skin
Insertion
Skin and mucosa of lips
Innervation
Buccal and marginal mandibular branches of facial nerve (CN VII)