Muscles in the head
- Frontal: it moves the scalp forwards. It raises eyebrows. It wrinkles the forehead skin.
- Occipital: it moves the scalp backwards. It is joined to the frontal muscle by the aponeurosis that covers the upper part of the cranium.
- Nasal: there are two nasal bones. They wrinkles the nose.
- Buccinator: it inflates the cheeks.
- Orbicularis oculis: it closes the eyes.
- Orbicularis oris: it closes and presses the lips together. It can also push them forwards.
- Risorius: it pulls the lip commissure sideways. Like smiling
- Supercilii: it pulls the internal part of the eyebrows down. Like frowning.
- Zygomatic major: it moves the extremes of the lips upwards. Like laughing.
- Masseter: it closes the mouth raising the mandible.
- Temporal: it raises and retracts the mandible. If one of them relaxes and the other contracts, the mandible moves laterally.
- Levator palpebrae superioris: it raises the upper eyelid.
- Levator lavi superioris: it raises the upper lip.
- Digastric: it raises the hyoid bone and descends the mandible to open the mouth.
- Mentalis: it raises the central part of the lower lip.