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The tendon of the superior oblique muscle passes through it.
This summary of the superior oblique muscle describes its most important functions.
The fourth cranial nerve innervates the superior oblique muscle for each eye.
The superior oblique muscle is one of the six extraocular muscles that allow movement of eye.
Young children adopt a compensatory head position in order to compensate for the underacting superior oblique muscle.
The superior oblique muscle, which is outside the muscle cone, is not usually paralyzed.
Fourth nerve palsy is a condition caused by weakness or paralysis of the superior oblique muscle.
It is located in the superior nasal orbit and functions as a pulley for the superior oblique muscle.
Finally, it enters the orbit through the superior orbital fissure and innervates the superior oblique muscle.
Cases of congenital fourth nerve palsy vary in magnitude and way they affect the motion of the superior oblique muscle.
Specifically, the trochlea referred to is a loop inside the orbit of the eye, through which the tendon of the superior oblique muscle passes.
An exception is the trochlear nucleus in the brainstem, which innervates the superior oblique muscle of the eye on the opposite side of the face.
The superior oblique muscle is innervated by cranial nerve IV (trochlear nerve).
The oculomotor nerve controls all of the muscles that move the eye with the exception of the lateral rectus and superior oblique muscles.
Incyclotorsion is a term applied to the inward, torsional (rotational) movement of the eye, mediated by the superior oblique muscle of the eye.
The superior oblique muscle ends in a tendon that passes through a fibrous loop, the trochlea, located anteriorly on the medial aspect of the orbit.
In patients with superior oblique palsy, the superior rectus muscle's action is not counteracted by the superior oblique muscles.
It passes above the pulley of the Superior oblique muscle, and gives off a descending filament that joins the infratrochlear branch of the nasociliary nerve.
The body of the superior oblique muscle is located behind the eyeball, but the tendon (which is redirected by the trochlea) approaches the eyeball from the front.
Trochlea of superior oblique (see also superior oblique muscle), which is supplied by the so-called trochlear nerve or fourth cranial nerve.
In these cases the main problem is that the inferior oblique muscle of the same eye acts unopposed by the weakened superior oblique muscle, pulling the eye up.
Bielschowsky's head tilt test: A test for palsy of the superior oblique muscle caused by damage to cranial nerve IV (trochlear nerve).
Once branching from the ophthalmic artery, it passes between the upper border of the medial rectus muscle and superior oblique muscle to enter the posterior ethmoidal canal.
As would be expected, the diplopia gets worse when the affected eye looks toward the nose - the contribution of the superior oblique muscle to downward gaze is greater in this position.
Pain is exacerbated by eye movements looking down and inwards, and especially in supraduction (looking up) and looking outwards, which stretches the superior oblique muscle tendon.