Practical 4: Head/Neck muscles

frontalis

ocularis oculi

masseter

buccinator

orbicularis oris

mentalis

Frontalis: actions

raise eyebrows, draw scalp anteriorly

Frontalis: innervation

facial nerve (VII)

temporalis: actions

elevate mandible

temporalis: innervation

trigeminal nerve

masseter: actions

elevate mandible

masseter: innervation

trigeminal nerve

orbicularis oculi: actions

close eyelid

orbicularis oculi: innervation

facial nerve (VII)

orbicularis oris: actions

close lips

orbicularis oris: innvervation

facial nerve (vii)

risorius: actions

abduct corner of mouth (lateral)

risorius: innervation

facial nerve (vii)

mentalis: actions

protrude lower lip

mentalis: innervation

facial nerve

buccinator: actions

compress cheek

buccinator: innervation

facial nerve

zygomaticus (maj and min): actions

elevate corner of mouth

zygomaticus (maj and min): innervation

facial nerve

depressor labii inferioris: actions

depress inferior lip

depressor labii inferioris: innervation

facial nerve

levator labii superioris: actions

elevate superior lip, flare nostril

levator labii superioris: innervation

facial nerve