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Muscles and Actions
Head, neck and back
Muscle | Action |
---|---|
Occipitofrontalis | Draws scalp anteriorly & posteriorly, elevates eyebrows, wrinkles forehead |
Procerus | Wrinkles over bridge of nose |
Corrugator supercilii | wrinkles eyebrows |
Nasalis | flares nostrils |
Orbicularis Oculi | closes and squints eye |
Orbicularis Oris | closes mouth, protracts lips |
Depressor anguli oris | draws angle of mouth downward and laterally |
Risorius | draws angle of mouth laterally |
Zygomaticus | smile |
Levator Labii superioris | elevates and everts upper lip |
Levator anguli oris | elevates the angle of mouth |
Buccinator | whisle |
Platysma | creates ridges of skin in neck |
Mentalis | pout |
Massester | closes mouth (strongest muscle relative to size) |
Temporalis | closes mouth |
pterygoid | side to side chewing |
SCM | flexion of neck, lateral flexion and contralateral rotation of neck |
Scalenus | elevates 1st rib, excessory breathing muscle |
Splenius capitis and cervicis | extension, lateral flexion, ipsilateral rotation |
Erector Spinae | extension, lateral flexion, ipsilateral rotation, *anterior tilt of pelvis |
Transversospinales | extension, *lateral flexion, contralateral rotation |
suboccipitals | extension @ atlanto-occipital joint* |