Muscles of facial expression

Mentalis

Origin: body of the mandible

Insertion: skin of the chin

Action: elevates, protracts, and depresses lower lip

Depressor labii inferioris

Origin: inferior margin of the mandible

Insertion: orbicularis oris muscle

Action: depresses lower lip

Orbicularis oris

Origin: medial planes of maxillae and mandible

Insertion: lips

Action: compresses and protrudes the lips

Buccinator

Origin: aveolar processes of the maxillae and mandible

Insertion: corner of the mouth

Action: compress cheeks

risorious

Origin: masseter muscle

Insertion: corner of mouth

Action: retracts corner of the mouth

Levator labii superioris

Origin: infraorbital maxillae

Insertion: upper lip

Action: elevates upper lip

Zygomaticus major

Origin: zygomatic bone

Insertion: corner of the mouth

Action: draws corner of the mouth

Zygomaticus minor

Origin: zygomatic bone

Insertion: orbicularis oris muscle

Action: elevates upper lip

Orbicularis Oculi

Origin: medial orbital margin

Insertion: skin around the orbit

Action: closes eyelid

Nasalis

Origin: superior maxilla

Insertion: nasal cartilage

Action: draws nasal ala medially

Epicranius

compound structure containing epicranial aponeurosis, occipitofrontalis, occipital belly, and the frontal belly

Epicranial aponeurosis

connective tissue portion of epicranius

occipitofrontalis

muscular bellies of epicranius

occipital belly

Origin: occipital bone

Insertion: epicranial aponeurosis

Action: retracts scalp

frontal belly

Origin: epicranial aponeurosis

Insertion: skin of forhead and eyebrows

Action: elevates eyebrows and scalp