Gross Human Anatomy Practical 2 (Lab 8 - Facial Muscles/Skull)

Occipitofrontalis Origin

• Occipital belly: superior nuchal line of occipital bone

• Front belly: epicranial aponeurosis

Occipitofrontalis Insertion

• Occipital belly: epicranial aponeurosis

• Front belly: skin of eyebrow

Occipitofrontalis Action

• Occipital belly: pulls scalp backwards

• Frontal belly: raises eyebrows

Occipitofrontalis Nerve Supply

• Occipital belly: posterior auricular nerve

• Frontal belly: temporal branch of cranial nerve VII

Temporalis Origin

Temporal fossa

Temporalis Insertion

Coronoid process of mandible

Temporalis Action

Elevates/retracts mandible

Temporalis Nerve Supply

Cranial nerve V (trigeminal)

Orbicularis Oculi Origin

Nasal part of frontal bone/maxilla/lacrimal

Orbicularis Oculi Insertion

Skin of orbital region

Orbicularis Oculi Action

Opens/closes eye

Orbicularis Oculi Nerve Supply

Temporal/zygomatic branch of cranial nerve VII

Zygomaticus Major Origin

Lateral surface of zygomatic bone

Zygomaticus Major Insertion

Angle of mouth

Zygomaticus Major Action

Elevates angle of mouth

Zygomaticus Major Nerve Supply

Zygomatic/buccal branches of cranial nerve VII

Zygomaticus Minor Origin

Anterior lateral surface of zygomatic bone

Zygomaticus Minor Insertion

Angle of mouth

Zygomaticus Minor Action

Elevates upper lip

Zygomaticus Minor Nerve Supply

Zygomatic/buccal branches of cranial nerve VII

Masseter Origin

Inferior aspect of zygomatic arch

Masseter Insertion

• Lateral coronoid process of mandible

• Ramus of mandible

Masseter Action

Elevates mandible, assists in protraction of mandible

Masseter Nerve Supply

Mandibular branch of cranial nerve V

Buccinator Origin

Alveolar processes of maxilla and mandible, pterygomandibular raphe

Buccinator Insertion

Angle of mouth

Buccinator Action

Compresses cheeks

Buccinator Nerve Supply

Buccal branch of cranial nerve VII

Orbicularis Oris Origin

Modiolus of angulus oris and vermillion line

Orbicularis Oris Insertion

Skin and fascia of lips

Orbicularis Oris Action

Compresses and protrudes lips

Orbicularis Oris Nerve Supply

Buccal/marginal mandibular branches of cranial nerve VII