Muscles and insersions-Lab Practical 4 Flashcards
Orbicularis oris origin
Maxilla and mandible
Orbicularis oris insertion
Lips
Orbicularis oris action
Closes and purses lips (“kissing muscle”)
Zygomaticus major origin
Zygomatic bone
Zygomaticus major insertion
Angle of mouth
Zygomaticus major/minor
action
Smiling muscles
Zygomaticus minor origin
Zygomatic bone
Zygomaticus minor insertion
Upper lip
Buccinator origin
Alveolar processes
Buccinator insertion
Fibers surrounding the orbicularis oris
Buccinator action
Compresses cheek (the “trumpeter’s muscle”)
Platysma origin
Superior thorax
Platysma insertion
Mandible and skin of cheek
Platysma action
Tenses skin of neck and depresses mandible
Risorius origin
Fascia around the parotid salivary gland
Risorius insertion
Angle of the mouth
Risorius action
Draws corners of mouth to the side
Corrugator supercilii origin
Frontal bone
Corrugator supercilii insertion
Eyebrow
Corrugator supercilii action
Wrinkles eyebrows