Orbital part of orbicularis oculi

The orbital part of the orbicularis oculi (Latin: pars orbitalis musculi orbicularis oculi) is one of the orbicularis oculi muscle parts. It lies circularly around the opening of the orbit. The orbicularis oculi muscle is classified as the circumorbital and palpebral facial muscle.

Origin

The orbital part of the orbicularis oculi originates from the medial palpebral ligament.

Insertion

Fibers of this orbicularis oculi muscle part run around the orbital opening and insert into the origin site.

Action

Contractions of the orbital part of the orbicularis oculi lift the cheek and narrow the space between the eyelids (close the eyelids).

Innervation

The orbital part of the orbicularis oculi is innervated by the temporal and zygomatic branches of the facial nerve (CN VII).

Blood supply

The orbital part receives arterial blood supply from the branches of the facial, superficial temporal and ophthalmic arteries.