Extraocular Muscles Diagram

The course of cranial nerves CNs III oculomotor superior and inferior divisions IV trochlear and VI abducens are shown as they enter the orbit through the superior orbital fissure to innervate the extraocular muscles. Eye muscles work together with other eye muscles of the same eye and the opposite eye to move both eyes together in various directions.

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A useful mnemonic for remembering the nerve supply to the extraocular muscles is.

Extraocular muscles diagram. Alice Ferng BS MD PhD Reviewer. January 20 2021 Reading time. Innervated by the fourth nerve.

Extraocular muscles this image shows the tendon of the superior oblique muscle when it changes its course from forward to backwards and inserts on the superior aspect of the globe posterior to its equator. Lacrimal gland with its sac and nasolacrimal duct. LR Lateral rectus.

Extraocular Muscles Allow accurate positioning of visual axis Determine the spatial relationship between the two eyes Responsible for binocular vision Have the smallest motor unit among skeletal muscles ratio of nerve fibre to muscle fibre is 12whereas 125 in other skeletal muscles -Yoke Muscles. Extraocular muscles are shown in this image of the left eye lateral view. There are seven extraocular muscles the levator palpebrae superioris superior rectus inferior rectus medial rectus lateral rectus inferior oblique and superior oblique.

Eye movements must be precise and fast. Lateral Rectus LR Medial Rectus MR Superior Rectus SR Inferior Rectus IR Superior Oblique SO Inferior Oblique IO. These are known as yoked eye movements.

Motility diagrams are typically drawn to reflect the actions of the extraocular muscles in the cardinal positions. Orbital and retrobulbar fascia. Cardinal positions of gaze.

And one other levator palpebrae. Cranial nerves II III IV V and VI. The lateral walls of orbits slope backwards and medially making a right 90 angle with every other.

The medial rectus muscle has been sectioned and retracted in this drawing of the right eye to show the position of the extraocular muscles. Each rectus muscle also has a surrounding fascial sheath that covers the muscle from its origin to its insertion. The orbital contents comprise the eye.

Superior rectus inferior rectus medial rectus and lateral rectus. Responsible for eye movement. Extraocular muscles that move the eyeballs within the orbit Intrinsic ocular muscles which are within the eyeball itself and control how the eyes accommodate Six extraocular muscles move the eye.

Diagram of inferior oblique superior oblique tendon images of superior oblique extraoccular muscle ppt on extraocular muscles. There are seven extraocular muscles-Levator palpebrae superioris. Muscle Activity Both eyes face forwards and their long axes visual optic axes is located in sagittal plane parallel with every other and with medial walls of the orbits.

Extraocular muscles help move the eye in different directions. The muscles that move the eye within the orbit appear straightforward at first sight but the ways in which they work together to move the eye can lead to co. Superior rectus inferior rectus medial rectus lateral rectus superior oblique and inferior oblique muscles.

This is seen in scenarios like reading where the reader must shift. They work to control the movements of the eyeball including the superior eyelid. Click on the structures for more information.

Schematic diagram of the actions of the extraocular muscles and their innervation. The six extraocular muscles are the lateral medial inferior and superior rectus and the inferior and superior oblique muscles. Dimitrios Mytilinaios MD PhD Last reviewed.

Some of its actions include depression and abduction movements of the eyes. Responsible for superior eyelid movement Recti and oblique muscles. Here is a schematic of a left eye showing how its extraocular muscles insert into the eye.

The extraocular muscles are placed in the orbit but are extrinsic and separate from the eyeball itself. Eye muscle anatomy there are six extraocular muscles that move the globe eyeball. See diagram anatomy of the eye above.

There is a short list of causes for enlarged extraocular muscles. Motility diagrams reflect this relationship between the various actions of the extraocular muscles. The differential can be narrowed by the clinical history known systemic illness pattern of specific muscles involved the muscle morphology as well as concurrent findings outside the muscles 3.

Anatomy of the Extraocular Muscles 1 2 3 FIGURE 1. There are six muscles per eye responsible for generating all movements of the eyes in their bony orbits. LR 6 SO 4 AO 3.

The superior oblique muscle is primarily responsible for intorsion of the eye. A muscle of one eye is paired with another muscle of the fellow eye to produce a cardinal gaze -Example. SO Superior oblique.

8 minutes Extraocular muscles are also referred to as the extrinsic arising externally or muscles of the orbitThere are 6 of these extraocular muscles that control eye movement cows only have 4 of these and one muscle that controls eyelid elevation. The extraocular muscles are located within the orbit but are extrinsic and separate from the eyeball itself. Right LR Left MR while looking towards right side They develop from.

Since only a small part of the eye called the fovea provides sharp vision the eye must move to follow a target. The orbit is composed of 7 bones and has a pyramidal shape with its apex pointed posteromedially. AO All other extraocular muscles.

Innervated by the sixth nerve. All 6 extraocular muscles penetrate anteriorly through sleeves or slits in the Tenon capsule en route to their insertion onto the globe. These muscles characteristically originate from the common tendinous ring.

Palpebral and suspensory ligaments. Inflammatory infectious and deposition disorders. They act to control the movements of the eyeball and the superior eyelid.

Innervated by the third nerve Figure-2.

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