Orbicularis oculi muscle
Updates to Article Attributes
Orbicularis oculi aremuscle is a muscle of facial musclesexpression, a ring-like muscle functioning in a number of eyelid movements.
Gross anatomy
The orbicularis oculi are made up of three parts theis subdivided into orbital, palpebral and lacrimal parts.Each has defined actions.
The orbicularis oculi areis secured to the medial and lateral palpebral ligament forming a ring in the eyelid tissue centred about the anterior eye. It also inserts on the eyelid 'skeleton' the tarsal plate. It forms connections withbetween the superficial muscular aponeurotic system (SMAS) of the face toand frontalis, the temple and the cheek.
Laterally the fibres 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 fibres 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.
-<p><strong>Orbicularis oculi</strong> are <a href="/articles/facial-muscles">facial muscles</a>, a ring-like muscle functioning in a number of eyelid movements.</p><h4>Gross anatomy</h4><p>The orbicularis oculi are made up of three parts the orbital, palpebral and lacrimal parts. Each has defined actions. </p><p>The orbicularis oculi are secured to the medial and lateral palpebral ligament forming a ring in the eyelid tissue centred about the anterior eye. It also inserts on the eyelid 'skeleton' the tarsal plate. It forms connections with the superficial muscular aponeurotic system (SMAS) of the face to <a href="/articles/frontalis">frontalis</a>, the temple and the cheek. </p><p>Laterally the fibres are pierced by the <a href="/articles/zygomaticofacial-nerve">zygomaticofacial nerve</a> which supplies the skin over the zygoma.</p><h5>Orbital part</h5><p>The orbital part forms the bulk of the muscle, can squeeze the eyelid closed tightly and is used in bright light.</p><h5>Palpebral part</h5><p>Has thinner fibres continuous with the orbital part. It functions to lightly close the eyelid. </p><h5>Lacrimal part</h5><p>Forms a small slip originating adjacent to the <a href="/articles/lacrimal-gland">lacrimal gland</a> to insert on the lateral eyelid. It is thought to promote flow within the gland. </p>- +<p><strong>Orbicularis oculi</strong> <strong>muscle</strong> is a <a href="/articles/facial-muscles">muscle of facial expression</a>, a ring-like muscle functioning in a number of <a title="Eyelid" href="/articles/eyelid">eyelid</a> movements.</p><h4>Gross anatomy</h4><p>The orbicularis oculi is subdivided into orbital, palpebral and lacrimal parts.<br>Each has defined actions. </p><p>The orbicularis oculi is secured to the medial and lateral palpebral ligament forming a ring in the eyelid tissue centred about the anterior eye. It also inserts on the eyelid 'skeleton' the tarsal plate. It forms connections between the <a title="superficial muscular aponeurotic system" href="/articles/superficial-muscular-aponeurotic-system">superficial muscular aponeurotic system (SMAS)</a> of the face and <a href="/articles/frontalis">frontalis</a>, the temple and the cheek. </p><p>Laterally the fibres are pierced by the <a href="/articles/zygomaticofacial-nerve">zygomaticofacial nerve</a> which supplies the skin over the <a title="Zygoma" href="/articles/zygoma-1">zygoma</a>.</p><h5>Orbital part</h5><p>The orbital part forms the bulk of the muscle, can squeeze the eyelid closed tightly and is used in bright light.</p><h5>Palpebral part</h5><p>Has thinner fibres continuous with the orbital part. It functions to lightly close the eyelid. </p><h5>Lacrimal part</h5><p>Forms a small slip originating adjacent to the <a href="/articles/lacrimal-gland">lacrimal gland</a> to insert on the lateral eyelid. It is thought to promote flow within the gland. </p>