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Orbital Part of Orbicularis Oculi
Muscular System

Orbital Part of Orbicularis Oculi

Pars orbitalis musculi orbicularis oculi

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Quick Facts

Origin: Nasal part of frontal bone, frontal process of maxilla, and medial palpebral ligament.

Insertion: Adjacent muscles.

Action: Closes eyelids.

Innervation: Temporal and zygomatic branches of facial nerve (CN VII).

Arterial Supply: Facial, superficial temporal, maxillary, and ophthalmic arteries.

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Origin

The orbicularis oculi muscle is a broad, flat muscle that encircles the orbit, thus forming a sphincter around each of the eye sockets. It may be divided into three portions:

- orbital part;

- palpebral part;

- lacrimal part.

The orbital part of the orbicularis oculi muscle originates from the nasal part of the frontal bone, the frontal process of maxilla, and the medial palpebral ligament.

Insertion

The orbital part of the orbicularis oculi muscle encircles the orbit and its fibers blends with adjacent muscles.

Actions

The orbital part of the orbicularis oculi muscle closes the eyelids (Standring, 2016).

List of Clinical Correlates

- Bell’s palsy

- Lagophthalmos

References

Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

Learn more about this topic from other Elsevier products

Orbicularis Oculi Muscle

ScienceDirect image

They are small thin muscles of pyramidal shape that pass between the orbital and palpebral portions of the orbicularis oculi muscles to insert on the skin of the eyebrows.

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