What is extraocular movement?

EOM; Extraocular movement; Ocular motilityOcular motilityEye movement includes the voluntary or involuntary movement of the eyes, helping in acquiring, fixating and tracking visual stimuli. A special type of eye movement, rapid eye movement, occurs during REM sleep.

What is extraocular eye movement?

Inferior Oblique (IR) Rotates the top of the eye away from the nose (extorsion) Moves the eye upwards (elevation) Moves the eye outwards (abduction)

How do you assess extraocular movements?

Your provider will hold a pen or other object about 16 inches or 40 centimeters (cm) in front of your face. The provider will then move the object in several directions and ask you to follow it with your eyes, without moving your head. A test called a cover/uncover test may also be done.

What is the function of extraocular muscles?

The extraocular muscles are located within the orbit, but are extrinsic and separate from the eyeball itself. They act to control the movements of the eyeball and the superior eyelid.

Where are extraocular muscles?

Six muscles outside the eye govern its movements. These muscles are the four rectus muscles—the inferior, medial, lateral, and superior recti—and the superior and inferior oblique muscles.

Why do we test extraocular movements?

The extraocular muscle function test is performed to evaluate any weakness, or other defect in the extraocular muscles which results in uncontrolled eye movements. The test involves moving the eyes in eight different directions in space to evaluate the proper functioning of the extraocular muscles of the eyes.

How many extraocular muscles are there?

six extraocular muscles

There are six extraocular muscles that move the globe (eyeball). These muscles are named the superior rectus, inferior rectus, lateral rectus, medial rectus, superior oblique, and inferior oblique.

What are the 6 ocular movements?

You are now familiar with the 6 cardinal directions of gaze (right/up; right; right/down; left/up; left; left/down), as well as the remainder of the yoked eye movements (straight up; straight down; convergence).

Which part of the brain controls eye movement?

The cerebellum plays a pivotal role in the control of eye movements. Its core function is to optimize ocular motor performance so that images of objects of interest are promptly brought to the fovea – where visual acuity is best – and kept quietly there, so the brain has time to analyze and interpret the visual scene.

What neurological disorders cause eye problems?

Optic Nerve Disorders

  • Optic Neuropathies. Damage to the optic nerves can cause pain and vision problems, most commonly in just one eye. …
  • Optic Neuritis. …
  • Giant Cell (Temporal) Arteritis. …
  • Chiasm Disorders.

Which cranial nerves control extraocular eye movements?

The extraocular muscles are innervated by lower motor neurons that form three cranial nerves: the abducens, the trochlear, and the oculomotor (Figure 20.3).