How do you remember the actions of extraocular muscles?
If so, struggle no longer – here’s a mnemonic to make your Monday a little easier. SALT ME DOWN: Six Abducts Laterally, Trochlear acts Medially Down. The oculomotor nerve is responsible for everything else. To review: the abducens nerve (CN VI) will abduct the eye through its innervation of the lateral rectus muscle.
How do the eye muscles move the eye?
EXTRAOCULAR MUSCLES: There are six muscles that attach to the eye to move it. These muscles originate in the eye socket (orbit) and work to move the eye up, down, side to side, and rotate the eye. The superior rectus is an extraocular muscle that attaches to the top of the eye. It moves the eye upward.
What is the function action of the EOM?
This extraocular muscle helps move the pupil away from the body’s midline. It’s also responsible for the horizontal movement, similar to the medial rectus muscle.
How do you remember the innervation of extraocular muscles?
LR6(SO4)3 is a simple mnemonic representing the innervation of the extraocular muscles. It stands for: LR6: Lateral rectus muscle which is supplied by the sixth cranial nerve. SO4: Superior oblique muscle which is supplied by the fourth cranial nerve.
What is extraocular movement?
The extraocular muscles execute eye movements and are innervated by three cranial nerves. The muscles are attached to the sclera of the eye at one end and are anchored to the bony orbit of the eye at their opposite ends. Contraction of the muscles produce movement of the eyes within the orbit.
What is normal extraocular movement?
Extraocular movements and cranial nerves: Normally, the eyes move in concert (e.g. when the left eye moves left, the right eye moves left to a similar degree). The brain takes the input from each eye and puts it together to form a single image.
What is extraocular motility?
The term ocular motility refers to the study of the twelve extraocular muscles and their impact on eye movement. Each eye has six muscles, four rectus and two oblique, which, when functioning properly, allow the eyes to work together in a wide range of gaze.
What are the functions of extraocular muscles?
The Extraocular Muscles
- Moves the eye Upwards (Elevation)
- Rotates the top of the eye towards the nose (intorsion)
- Moves the eye inward (adduction)
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.
How do you test for EOM?
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.
How many extraocular muscles move each eye?
six extraocular muscles
The contributions of the six extraocular muscles to vertical and horizontal eye movements. Horizontal movements are mediated by the medial and lateral rectus muscles, while vertical movements are mediated by the superior and inferior rectus and the superior (more…)
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 are the actions of extraocular muscles?
These muscles are responsible for movements of the eye along three different axes: horizontal, either toward the nose (adduction) or away from the nose (abduction); vertical, either elevation or depression; and torsional, movements that bring the top of the eye toward the nose (intorsion) or away from the nose ( …