Netter's Anatomy Flashcards 5th Edition
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Title | Muscles of Facial Expression: Lateral View 3 |
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Origin | Orbicularis oculi muscle arises from the nasal portion of thefrontal bone, the frontal process of the maxilla, the lacrimal bone, andthe medial palpebral ligament. |
Insertion | Orbicularis oculi muscle attaches to the skin of the eyelids,surrounds the bony orbit, and inserts into the superior and inferiortarsi medial to the lacrimal puncta. |
Actions | The orbicularis oculi muscle is a sphincter that closes theeyelids. Its palpebral portion closes the lids gently, as in blinking. Theorbital portion closes the eyelids more forcibly. |
Innervation | Terminal branches of the facial nerve; primarily thetemporal and zygomatic branches. |
Attachments | |
Comment | The orbicularis oculi has 3 parts: an orbital part, which isthicker and surrounds the orbital margin; a palpebral part, which isthin and lies in the eyelids; and a lacrimal part.As a muscle of facial expression, this cutaneous muscle lies withinthe layers of the superficial fascia. |
Clinical | All of the muscles of facial expression are derivedembryologically from the 2nd pharyngeal (branchial) arch and areinnervated by the terminal branches of the facial nerve (CN VII).Acute, unilateral facial palsy is the most common cause of facialmuscle weakness and is called Bell’s palsy. In Bell’s palsy,paralysis of the orbicularis oculi would result in an inability to winkor close the eyelid ipsilaterally, with the potential for damage to thecornea because the tear film would not be evenly distributedacross the cornea’s surface. |
1a | 1. Orbicularis oculi muscle |
2a | 2. Nasalis muscle (Transverse and alar parts) |
3a | 3. Buccinator muscle |
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Plate | |
Tags | Netters::Head_and_Neck |
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