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obicularis oculi has three parts. what are their actions?
• Orbital part – concentric fibres which sweep around the orbit; contraction of these fibres causes you to close your eyelids tightly.
• Palpebral part – fibres which pass across the eyelid; contraction of these fibres causes you to close your eyelids gently (blinking / sleeping).
• Lacrimal part – a few fibres attach to the lacrimal sac; contraction pulls the lacrimal sac open and keeps the lacrimal puncta in contact with the eyeball.
Occipitofrontalis and levator palpebrae superioris antagonise the action of orbicularis ocul
• Palpebral part – fibres which pass across the eyelid; contraction of these fibres causes you to close your eyelids gently (blinking / sleeping).
• Lacrimal part – a few fibres attach to the lacrimal sac; contraction pulls the lacrimal sac open and keeps the lacrimal puncta in contact with the eyeball.
Occipitofrontalis and levator palpebrae superioris antagonise the action of orbicularis ocul
