Muscles of Facial Expression

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Nasalis:

Originates on the maxilla and inserts on the nasal cartilage at the midline; it flares the nostrils.

Corrugator supercilii muscles:

Originates on the frontal bone (specifically, from the medial supraorbital margin) and insert on the medial half of the eyebrows and laterally on the supraorbital margin on the frontal bone; they depress the eyebrows (and pull them medially).

Orbicularis oculi:

Originates on the medial margin of the orbit (specifically, from the maxillary, frontal, and lacrimal bones), and inserts into the rim and skin of the orbit and eyelids; it moves the eyelids and surrounding skin to squint and close the eyes.

Frontalis:

Originates on the frontal bone and skin of the eyebrows, and inserts into the galea aponeurotica (aka, the epicranial aponeurosis); it elevates the eyebrows, which wrinkles the forehead horizontally.

Orbicularis oris:

Originates on the skin and other muscles around the mouth and inserts into the skin of the lips; it closes the lips.

Zygomaticus major:

Originates on the lateral side of the zygomatic bone and inserts into the angle of the mouth; it draws the corner (aka, angle) of the lips laterally and superiorly.

Zygomaticus minor:

Originates on the anterior aspect of the zygomatic bone and inserts into the skin of the upper lip, which it elevates.

Levator labii superioris:

Originates on the maxilla (specifically, from the infraorbital margin), and inserts into the skin of the upper lip, which it elevates; it also dilates (flares) the nostrils.

Buccinator:

Originates on the surfaces of the maxilla and mandible, and inserts into the lips; it compresses the cheeks.

Risorius:

Originates on connective tissues on the lateral sides of the face and the skin of the cheeks and inserts into the angle of the mouth; it retracts the lips at the angle of the mouth.

Mentalis:

Originates on the body of the mandible and inserts into the skin of the chin and lower lip, which it elevates and protrudes.

Depressor labii inferioris:

Originates on the mandible (specifically, from the anterolateral body) and inserts into the skin of the lower lip, which it depresses.

Additional Information:

Cranial nerve VII (the facial nerve) innervates the muscles of the scalp, eyes, and nose.
Bell's palsy occurs when CN VII is damaged; Belly's palsy results in asymmetrical paralysis of the muscles of facial expression.