lateral rectus muscle function

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Eye Musclesand grab your definitive anatomy study guide for free! Muscle of the posterior rectum: do you want to learn more about it? Our attractive videos, interactive questionnaires, in-depth articles and HD atlas are here to get the results faster. What do you prefer to learn with? "I would honestly say that Kenhub cut my study time in half. " - Kim Bengochea, University of Regis, Denver posterior rectum muscle Author: • Reviewer: Last revision: October 29, 2020 Reading time: 6 minutes The muscle of the lateral rectum is one of the 4 straight muscles of the orbit responsible for the movement of the in the cardinal directions. These muscles, along with the superiors and muscles, belong to the eye. The lateral rectum muscle emerges from the common tendentious ring and runs above the side of the orbit to insert into the side side of the eyeball. Like other straight muscles, the lateral rectum is named for its position within the orbit relative to the eyeball. The primary action of the lateral rectum muscle is the abduction of the eyeball. It works in synergy or opposition to other extrinsic muscles of the eye to produce coordinated movements and direct the look. Key data on the lower muscle of the rectum Origin Common tendentious ring (Annulus of Zinn) Insertion The previous half of the eyeball (after the corneoscleral union) Measured Abducts eyeball Innervation aducen nerves (CN VI) Blood supply ophthalmological artery This article will discuss the functions of the muscle of the lateral rectum of the eye. Origin and insertion The lateral rectum muscle is a flat belt-shaped muscle that is wider in its previous part. It rises from the side of the common tendon ring and crosses the upper orbital fissure. In addition, a small slip emerges from a column in the larger wing of the . Then, the muscle runs above the side wall of the orbit to insert into the side side of the eyeball after crossing the lower oblique muscle tendon. The muscle inserts prior to the equator of the eyeball, approximately 7 mm of the cornea limbo. Relations The lateral straight muscle extends along the side wall of the orbit. It emerges from the side of the common tendonous ring near the attachments of the lateral and upper straight muscles. This tendentious ring surrounds the margins of the optical channel and part of the upper orbital fissure, therefore the attached muscles form a cone that wraps the structures that enter the orbit. These structures include the optic sheath it contains and , the upper and lower divisions of , the nasociliar nerve (CN V1) and . After having emerged from the common tendentious ring, the lateral rectum is sideways to the near apex of the orbit. The lateral straight muscle runs along the side wall of the orbit towards the eyeball, moving medianly towards the . In addition, the lacrimal artery runs along the upper border of the muscle of the lateral rectum to supply the lacrimal gland. The side rectum muscle fascial pod deactivates a triangular expansion called lateral control ligament. This ligament attaches to the lateral rectum's orbital tubercle and serves to restrict the muscle of the lateral rectum and limit the eye's abduction. The lateral ligament of control is mixed with the same fascial expansions of the middle and lower muscles of the rectum, as well as upper and lower oblique muscles. Together, they form the suspended ligament of the eyeball, a hammock-type sling that provides support to the eyeball. Innervation The lateral straight muscle is supplied by branches of the abducens nerve (CN VI), which enters its medial surface and provides general somatic efferent fibers. Blood supply The muscle of the lateral rectum is supplied by the ophthalmmic artery derived from the . The ophthalmic artery supplies it directly or through its lacrimal branch. Function The lateral straight muscle abduces the eye and directs the lateral look on the horizontal plane. This action is assisted by the upper and lower oblique muscles that also lower the eyes between their other functions. Do you want to learn extraocular muscles easily and efficiently? Take advantage of the Kenhub's that focuses on key facts and will help you create your opinions! To abduce the look, the lateral rectum in a muscle of the eye has to work in coordination with the other eye, in which the medial rectum needs to relax when the lateral rectum is contracted. These muscles are called yoke muscles; they are described as functionally remunerated contralateral synergists that produce conjugated eye movements. Visit the next page and learn all the muscles that move your eyes! Clinical Significance Abducens nerve damage (CN VI) may result in paralysis of the lateral rectum muscle. This condition is called abducens nervio palsy. This condition may occur from an expanding lesion, such as a tumor or cyst that compresses the abducen nerve or its nucleus. The main symptoms of abducens nerve paralysis are reflected in the lateral dysfunction of the rectum, in which the eye cannot move laterally. Since the abducens nerve only internalizes the lateral rectum, other extraocular muscles will not be affected. Therefore, the muscle that is functionally antagonistic to the lateral rectum will overcome it and throw the eyeball at its side. This leads to the eyes being fully attached by the unplanned mid- rectum muscle. Muscle of the posterior rectum: do you want to learn more about it? Our attractive videos, interactive questionnaires, in-depth articles and HD atlas are here to get the results faster. What do you prefer to learn with? "I would honestly say that Kenhub cut my study time in half. " - Kim Bengochea, University of Regis, Denver References:Ilustrators: and grab your definitive anatomy study guide for free! Based on literature and academic research, validated by experts, and entrusted by more than 1 million users. Copyright © 2021 Kenhub. All rights reserved. Learning anatomy is not impossible. We're here to help. Learning anatomy is a massive company, and we are here to help you pass with flying colors.

Subscribe Side Rectus - Musculus rectus lateralis Anatomical pieces illustrated with images of e-Anatomy and descriptions of anatomical structures Anatomical hierarchy Rear Anatomical children Translations DescriptionOrigin: Anulus of Zinn at the orbital apex Origin: Insertion: 7 mm temporal to the corneal limbus Insertion: Nerve: Abducens nerve Nerve: Action: Abducts the eyeball Action: Description: The muscle of the lateral rectum is a muscle in the orbit. It is one of the six extraocular muscles that control the movements of the eye (abduction in this case) and the only muscle invaded by the abducens nerve, cranial nerve VI. Its function is to remove the student from the middle line of the body. It is clinically tested by asking the patient to look sideways. Description: lateral straight muscle The four Recti emerge from a fibrous ring (anulus tendineus communis) that surrounds the upper, medial and lower margins of the optical foramen and surrounds the optical nerve. The ring is completed by a long tendentious bridge over the lower and medial part of the upper orbital fissure and attached to a tubercle on the margin of the great wing of the sphenoid, tied to the fissure. Two specialized parts of this fibrous ring can be made: a lower part, the ligament or tendon of zinc, which gives origin to the lower Rectus, part of the Rectus internus, and the lower head of origin of the Rectus lateralis; and a top part, which gives origin to the superior Rectus, the rest of the Rectus medialis, and the upper head of the Rectus lateralis. This upper band is sometimes called the top tendon of Lockwood. Each muscle moves forward in the implicit position by its name, to be inserted by a tendentious expansion in the sclera, about 6 mm. from the margin of the cornea. Between the two heads of the lateral straight is a narrow interval, through which the two divisions of the oculomotor nerve, the nasociliar nerve, the abducent nerve and the ophthalmological vein pass. Although these muscles have a common origin and are inserted similarly in the sclera, there are certain differences that are observed in them in terms of their length and breadth. The Rectus Medialis is the widest, the lateral Rectus is the longest, and the upper Rectus is the thinst and narrowest. They picked up Zinn, Lockwood's top tendon. ImagesDownload e-AnatomyMobile and tablet users, you can download e-Anatomy in Appstore or GooglePlay. Subscribe now Discover our subscription plansPersonal data When you browse the IMAIOS website, cookies are placed in your browser. For some of them, your consent is necessary. Click on each cookie category to enable or disable your use. To benefit all the functionalities of IMAIOS, we advise to keep activation of all categories of cookies. If you want to use the connection through your Facebook or Google account, then you accept cookies placed by these third parties according to what you have agreed and consented to. These cookies allow you to obtain anonymous attendance statistics, as well as error reports during the site visit, to optimize your ergonomics, browsing and content. By deactivating these cookies, we will not be able to analyze site traffic or detect errors. As part of electronic learning when you see a video, our Vimeo service provider files cookies with your browser. By deactivating cookies, you may not see Vimeo videos. These cookies guarantee the proper functioning of the site, in particular the connection to your account (IMAIOS session cookies), site security () and online payment (). The website cannot work properly without these cookies. English Copyright © 2008-2021 IMAIOS SAS. All rights reserved.

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