orbicularis oculi muscle
The orbicularis oculi muscle is a muscle of facial expression, a ring-like muscle functioning in a number of eyelid movements.
Gross anatomy
The orbicularis oculi is subdivided into orbital, palpebral and lacrimal parts.
Each has defined actions.
The orbicularis oculi is secured to the medial and lateral palpebral ligament forming a ring in the eyelid tissue centered about the anterior eye. It also inserts on the eyelid 'skeleton' the tarsal plate. It forms connections between the superficial muscular aponeurotic system (SMAS) of the face and frontalis, the temple and the cheek.
Laterally the fibers are pierced by the zygomaticofacial nerve which supplies the skin over the zygoma.
Orbital part
The orbital part forms the bulk of the muscle, can squeeze the eyelid closed tightly and is used in bright light.
Palpebral part
Has thinner fibers continuous with the orbital part. It functions to lightly close the eyelid.
Lacrimal part
Forms a small slip originating adjacent to the lacrimal gland to insert on the lateral eyelid. It is thought to promote flow within the gland.
Siehe auch:
und weiter:
Assoziationen und Differentialdiagnosen zu Musculus orbicularis oculi:
