The orbicularis oculi (also orbicularis oculi muscle, latin: musculus orbicularis oculi) is a circular shaped muscle around the opening of the eye. Among other functions the orbicularis oculi muscle is involved in closing of the eyelid.
The orbicularis oculi consists of three parts: the orbital, the palpebral, and the lacrimal part. The orbital part of the orbicularis oculi lies circulary around the orbital opening. The palpebral part is situated in the upper and lower eyelids. And the lacrimal part of the orbicularis oculi lies the most profoundly.
All parts of the orbicularis oculi are innervated by branches of the facial nerve (CN VII).
Blood supply of the orbicularis oculi is provided by branches of the facial, superficial temporal, maxillary and ophthalmic arteries.