MMT Facial Muscles and Eyes

Temporalis and Masseter action

clench teeth together

Temporalis and Masseter Nerve supply

cranial nerve V (trigeminal)

Pterygoid (bilateral) action

protrude mandible

Platysma action

depresses angle of mouth and tightens skin over neck

Buccinator action

presses cheek firmly against side teeth, pulling back angle of mouth like blowing a trumpet, or blowing air into an empty bottle

Orbicularis oris action

closes and protrudes lips

Platysma, buccinator, and orbicular oris nerve supply are

cranial nerve VII (facial)

Temporalis, masseter, and pterygoid (bilateral) nerve supply are

cranial nerve V (trigeminal)

Lateral Rectus action

pulls eye laterally

Lateral Rectus Nerve

CN VI - Abducens

Medial Rectus action

pulls eye medially

Medial Rectus Nerve

CN III - Oculomotor

Superior Rectus action

pulls eye out and up

Superior rectus nerve

CN III Oculomotor

Inferior Oblique action

pulls eyes in and up

Inferior oblique nerve

CN III - oculomotor

Inferior rectus action

pulls eye out and down

Inferior rectus nerve

CN III - Oculomotor

Superior oblique action

pulls eye in and down

Superior oblique nerve

CN IV - Trochlear

Medial rectus, superior rectus, inferior oblique, and inferior rectus nerve supply

CN III - Oculomotor