What muscles laterally rotate the eyeball?
The lateral rectus is an extraocular muscle that attaches to the side of the eye near the temple. It moves the eye outward.
Which muscle is responsible for eyeball movement?
Three antagonistic pairs of muscles control eye movements: the lateral and medial rectus muscles, the superior and inferior rectus muscles, and the superior and inferior oblique muscles.
What is responsible for lateral eye movement?
The abducens nerve innervates the lateral rectus muscle of the eye. It is responsible for lateral eye movements. Injury to this nerve prevents such movement. Injury to this nerve can cause double vision.
How does the lateral rectus move the eye?
The primary action of the lateral rectus muscle is abduction of the eyeball. It works in synergy or opposition with other extrinsic muscles of the eye to produce coordinated movements and direct the gaze. This article will discuss the anatomy and functions of the lateral rectus muscle of the eye.
Which muscle rotates the eyeball medially quizlet?
The inferior rectus muscle depresses the eye and medially rotates it.
What does the lateral rectus muscle do in the eye?
The lateral rectus is a flat-shaped muscle, and it is wider in its anterior part. The lateral rectus muscle is an abductor and moves the eye laterally, and side to side along with the medial rectus, which is an adductor.
What does lateral rectus muscle do?
The lateral rectus muscle is one of the six extraocular muscles that control eye movements. It is responsible for abduction and is the only muscle that is innervated by the abducens nerve (CN VI).
What is lateral rectus muscle?
Which muscle enables us to elevate the eye and turns the eye laterally?
The superior oblique muscle rotates the eye medially and abducts it when the eye if facing forward while the inferior oblique rotates the eye laterally and adducts it. When the eye is adducted, or turned toward the nose, the superior oblique depresses the eye while the inferior oblique elevates the eye.
Which extrinsic eye muscle elevates the eye and moves it laterally?
Lateral Rectus This extraocular muscle helps move the pupil away from the body’s midline.
What is the orbicularis oculi muscle?
The orbicularis oculi muscle closes the eyelids and assists in pumping the tears from the eye into the nasolacrimal duct system. The orbital section of the orbicularis oculi is more involved in the voluntary closure of the eyelid, such as with winking and forced squeezing.
Where are the medial and lateral rectus muscles?
The medial rectus and the lateral rectus make up the horizontal rectus muscles. The superior and inferior rectus muscles form the vertical rectus muscles. Each of the rectus muscles originates posteriorly at the Annulus of Zinn and courses anteriorly. The medial rectus courses along the medial orbital wall.
What muscles are involved in the control of the eye?
There are six muscles involved in the control of the eyeball itself. They can be divided into two groups; the four recti muscles, and the two oblique muscles. There are four recti muscles; superior rectus, inferior rectus, medial rectus and lateral rectus. These muscles characteristically originate from the common tendinous ring.
Where does the lateral rectus muscle attach to the eye?
The lateral rectus eye muscle attaches to the side of the eye closest to the temple. This muscle is what allows the eye to move outward. Movement for the lateral rectus muscle is made possible by the abducens nerve.
What nerve elevates the eyeball and laterally rotates the eye?
Actions: Depresses, abducts and medially rotates the eyeball. Innervation: Trochlear nerve (CN IV). Attachments: Originates from the anterior aspect of the orbital floor. Attaches to the sclera of the eye, posterior to the lateral rectus Actions: Elevates, abducts and laterally rotates the eyeball. Innervation: Oculomotor nerve (CN III).
What adducts and rotates the eyeball medially?
depresses, adducts and rotates the eyeball medially Medial Rectus adducts the eyeball Lateral Rectus of the eyeball abducts the eyeball Superior Oblique of the eyeball