How does the superior rectus muscle move the eye?

How does the superior rectus muscle move the eye?

The superior rectus has a primary action of elevating the eye, causing the cornea to move superiorly. The superior rectus originates from the annulus of Zinn and courses anteriorly and superiorly over the globe, making an angle of 23 degrees with the visual axis.

How does the inferior rectus move the eye?

The inferior rectus has a primary action of depressing the eye, causing the cornea and pupil to move inferiorly. The inferior rectus originates from the Annulus of Zinn and courses anteriorly and laterally along the orbital floor, making an angle of 23 degrees with the visual axis.

What does the superior rectus muscle do?

Cranial nerve III innervates the medial rectus, inferior rectus, superior rectus, and inferior oblique muscles. The medial rectus adducts (turns in) the eye, the inferior rectus depresses the eye, the superior rectus elevates the eye, and the inferior oblique abducts, elevates, and extorts (rotates out) the eye.

Do the superior and inferior rectus abduct the eye?

When the eye is abducted, the rectus muscles are the prime vertical movers. Elevation is due to the action of the superior rectus, and depression is due to the action of the inferior rectus. When the eye is adducted, the oblique muscles are the prime vertical movers.

What nerve is responsible for Eye Movement?

Cranial nerve 3, also called the oculomotor nerve, has the biggest job of the nerves that control eye movement. It controls 4 of the 6 eye muscles in each eye: Medial rectus muscle (moves the eye inward toward the nose)

How many ocular muscles move the globe?

seven extraocular muscles
There are seven extraocular muscles – the levator palpebrae superioris, superior rectus, inferior rectus, medial rectus, lateral rectus, inferior oblique and superior oblique. Functionally, they can be divided into two groups: Responsible for eye movement – Recti and oblique muscles.

How do you test for superior rectus?

To test superior rectus from the inferior oblique, the clinician asks the patient to first look out (or lateral) to orient the visual gaze axis perpendicular to the inferior oblique muscle fiber direction, then up. After the inferior oblique is trapped, the only muscle that can mediate elevation is the superior rectus.

Does the superior rectus adduct?

In the primary position (looking straight ahead), the superior rectus muscle’s primary function is elevation, although it also contributes to intorsion and adduction.

Why does superior oblique depress the eye?

The superior oblique muscle, therefore, originates functionally from the trochlea at the superior medial orbital rim and inserts on the top of the globe behind its equator. When the eye is in adduction, this muscle exerts a more or less direct downward pull and depresses the eye.

Is the superior rectus part of the eye?

Medically reviewed by Healthline’s Medical Network on February 2, 2015. The superior rectus is an eye muscle, controlling the eye as it moves up. This muscle is among four muscles — including the medial rectus, lateral rectus, and the inferior rectus — which control the eye’s movement.

Where are the superior muscles of the eye?

Superior means “above” and rectus means “straight.”The superior rectus muscle is located on the top of the eye and it helps the eye look up, so the name is fitting.

How does the superior and inferior rectus muscles work?

When the eye is turned inward, those same two muscles work to raise and push the eye in. When a person looks straight ahead, all four muscles work together to stabilize the eye, with about half of the work performed by the superior and inferior rectus muscles.

What are the four recti muscles of the eye?

The four recti muscles are the lateral rectus, the medial rectus, the inferior rectus, and the superior rectus while the two oblique muscles are the inferior oblique and the superior oblique. In this post, we’ll talk about each of the six muscles and discover their function and purpose in the human eye.