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 inferior oblique muscle?
[2] The inferior oblique is responsible for extorsion, elevation, and abduction. Because of their course, the superior and inferior oblique muscles are the only muscles that can depress or elevate the eye, respectively when the eye moves in adduction.
What is inferior oblique Myotomy?
Inferior oblique Z-myotomy is a simple, fast, sutureless surgical procedure in which the original muscle insertion is preserved. Z-myotomy of the inferior oblique muscle can be used as a successful attenuation method in patients with minimal IOOA.
What is an inferior oblique myectomy?
Myectomy. Inferior oblique myectomy typically involves the surgical removal of a segment of muscle between the NFVB and the insertion of the muscle. 23,41. The muscle segment is cauterized prior to removal. The primary advantage is convenience as this procedure is faster than a recession.
How can you tell the difference between a DVD and an inferior oblique Overaction?
In inferior oblique overaction there is an increase of ipsilateral hypertropia in adduction to the contralateral side with a contralateral hypotropia, whereas in DVD, there is a hypertropia in adduction as well as in and abduction without a true contralateral hypotropia, when binocular fusion is interrupted.
Where is the inferior oblique located?
orbit
Like the other eye muscles, inferior oblique is named by its position within the orbit, relative to the eyeball. It occupies the inferior aspect of the orbit, encircling the lower portion of the eyeball. The primary action of this muscle is to elevate and abduct (laterally move) the eyeball.
Where is the inferior oblique muscle located quizlet?
The inferior oblique arises from the orbital surface of the maxilla, lateral to the lacrimal groove. Passing lateralward, backward, and upward, between the inferior rectus and the floor of the orbit, the inferior oblique inserts onto the scleral surface between the inferior rectus and lateral rectus.
Is the inferior oblique muscle vertical or horizontal?
When the eye is adducted, the oblique muscles are the prime vertical movers. Elevation is due to the action of the inferior oblique muscle, while depression is due to the action of the superior oblique muscle. The oblique muscles are also primarily responsible for torsional movements.
What is the superior oblique muscle?
The superior oblique is a fusiform (spindle-shaped) muscle belonging to the extraocular group of muscles. It originates near the nose. Along with the other extraocular muscles, it performs the role of controlling eye movements.
What is DVD in squint?
Dissociated vertical deviation (DVD) is an ocular motor disorder characterized by slow upward drifting of one eye when the patient fixates with the other eye. This can be unilateral or bilateral. The deviation may be manifest (spontaneously visible to others) or latent (only seen after a cover-uncover test).
Where is the inferior oblique muscle located *?
the orbit
What is left oblique?
An oblique tip is cut at an angle, which is usually about 15 degrees, normally from top right to lower left. This is called a left oblique. When the angle is from the top left to the lower right it is called a right oblique.
Where is the left oblique muscle?
Where is the Oblique Muscle Located? The oblique muscle group is located in the anterolateral abdominal wall. We also have a paired inferior oblique muscle and superior oblique muscle that are part of the extrinsic muscles of the eye orbit.
Where is the origin of the inferior oblique?
anterior orbit
The inferior oblique muscle has its origin on the maxillary bone just posterior to the inferior medial orbital rim and lateral to the nasolacrimal canal. The inferior oblique is the only extraocular muscle to have its anatomic origin in the anterior orbit.
What is the inferior oblique innervated by?
the oculomotor nerve
The inferior oblique is innervated by the inferior division of the oculomotor nerve, which enters the muscle on its upper surface.
Where is the superior oblique muscle located?
The superior oblique muscle is situated in the upper medial portion of the orbit, adjacent to its medial wall. The muscle is located superior to medial rectus and medial to both the superior rectus and levator palpebrae superioris muscles.
What causes Browns disease?
Brown syndrome is caused by a malfunction of the superior oblique muscle, causing the eye to have difficulty moving up, particularly during adduction (when eye turns towards the nose). Harold W. Brown first described the disorder in 1950 and initially named it the “superior oblique tendon sheath syndrome”.
What is inferior oblique muscle overaction?
Introduction Inferior oblique muscle overaction (IOOA) manifests by overelevation of the eye in adduction and is frequently associated with horizontal deviations. It is reported in 70% of patients with esotropia and 30% of patients with exotropia.
What are the treatment options for inferior oblique overaction?
In cases with inferior oblique overaction, a procedure is needed to weaken the muscle. This procedure can be performed with recess, disinsertion, myectomy, myotomy, or anterior transposition techniques. Placing the inferior oblique muscle insertion closer to its origo so that the muscle becomes more relaxed and muscle tension is reduced.
What is the length of the recessed inferior oblique muscle?
Recess Inferior Oblique Muscle Inferior oblique muscle is titrated based on the degree of overaction. The length of the inferior oblique muscle recessed: Overaction +2 is 6 mm Overaction +3 is 10 mm Overaction + 4 is 14 mm copyright: [email protected]
When should you not weaken the inferior oblique?
An inferior oblique that is not overactive should not be weakened because it is not possible to predict if and when an inferior oblique muscle will become overactive. Bilateral weakening in the presence of unilateral overaction produces a vertical deviation in the primary position.