[citation needed] It arises from the medial end of the superciliary arch; it inserts into the deep surface of the skin of the eyebrow.

[citation needed] Motor innervation is provided by the temporal branches of facial nerve (CN VII).

[clarification needed][1] Its fibres are situated between the palpebral and orbital portions of the orbicularis oculi muscle.

[4] It also contracts to prevent high sun glare,[4] pulling the eyebrows toward the bridge of the nose, making a roof over the area above the middle corner of the eye and typical forehead furrows[4] to shield the eye from excessively bright sunlight.

[1] The muscle is sometimes surgically severed or paralysed with botulinum toxin as a preventive treatment for some types of migraine or for aesthetic reasons.