1. Platysma
- Origin: fascia of the chest, deltoid muscles and pectoralis major
- Insertion: inserts into the mandible and skin of the lower face
- Action: Tightens the skin and pulls the corners of the lower lip down. It also is involved in facial expressions such as tension in the neck and grimacing.
2. Mentalis
- Origin: originates from the incisive fossa of the mandible
- Insertion: inserts into the skin of the chin
- Action: it protrudes the lips and is involved in the action of pouting and wrinkling of chin
3. Orbicularis Oris
- Origin: originates from the modiolus on each side of the mouth with it's deep fibers surrounding it
- Insertion: Inserts to the skin and mucous membrane of lips
- Action: movement of lips such as kissing as it protrudes and compresses the lips
4. Corrugator Supercilii
- Origin: originates from the medial end of the superciliary arch of the frontal bone
- Insertion: inserts into the skin of the eyebrow above the middle part of the supraorbital margin
- Action: draws the eyebrows medially and inferiorly and is involved in the expression called frowning
5. Orbicularis Oculi
- Origin: nasal part of frontal bone, frontal process of maxilla, medial palpebral ligament, lacrimal bone
- Insertion: skin of orbital region, lateral palpebral raphe, superior and inferior tarsal plates
- Action: closes eyelids and compresses lacrimal sac
6. Occipitofrontalis
- Origin: originates from the epicranial aponeurosis
- Insertion: inserts into the skin of the eyebrow
- Action: lifts eyebrow and eyelid and produces wrinkles in forehead
References:
Kenhub. (2023). Kenhub. https://www.kenhub.com/
Anatomy Next. (2023). Home. Anatomy.app. https://anatomy.app/