What is inferior oblique Overaction?

In primary inferior oblique muscle overaction, an upshoot of the adducting eye occurs when gaze is directed into the field of action of the inferior oblique muscle, producing a greater upward excursion of the adducted eye than of the abducted eye.

What is superior oblique Overaction?

Superior Oblique Overaction Vertical deviation, that increases on adduction to the contralateral side. Ex.: A left superior oblique overaction causes a right hypertropia on right gaze. Other features: Intorsion and abduction in downgaze.

What do the superior and inferior oblique muscles do?

The superior rectus and inferior oblique muscles primarily move the eye upward. The inferior rectus and superior oblique muscles primarily move the eye downward. The lateral rectus moves the eye horizontally laterally (abduction). The medial rectus muscle moves the eye horizontally medially (adduction).

What nerve controls the inferior oblique?

the oculomotor nerve
The inferior oblique is innervated by the inferior division of the oculomotor nerve, which enters the muscle on its upper surface.

What causes superior oblique palsy?

A common cause of acquired superior oblique palsy is head trauma, including relatively minor trauma. A concussion or whiplash injury from a motor vehicle accident may be sufficient enough to cause the problem. Rare causes of superior oblique palsy are stroke, tumor and aneurysm.

What is inferior rectus?

The inferior rectus is one of the seven extraocular muscles and is primarily responsible for depressing the eye (downgaze). The inferior rectus is one of the four rectus muscles, which also include the superior rectus, the medial rectus, and the lateral rectus.

What happens if superior rectus is damaged?

Damage to the superior rectus muscle contributes the several vision conditions including weakness of elevation, vertical diplopia (double vision), eye pain, proptosis (abnormal protrusion of the eye), and strabismus (eye turning). Visual acuity may or may not be affected by a problem with the superior rectus muscle.

What is the function of superior rectus muscle?

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.

What is the function of the inferior rectus?

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 is the function of superior rectus?

What nerve innervates the superior rectus?

The superior rectus is innervated by the superior division of the oculomotor nerve, which enters the muscle on its inferior face. Branches pass either through the muscle or around it to innervate the levator.