What muscle moves the eye laterally?
lateral rectus
Contraction of the lateral rectus pulls the eye away from the nose (abduction or lateral movement).
What is responsible for lateral eye movement?
Horizontal movement is controlled entirely by the medial and lateral rectus muscles; the medial rectus muscle is responsible for adduction, the lateral rectus muscle for abduction. When the eye is adducted, the oblique muscles are the prime vertical movers.
How do you test lateral eye movement?
The test itself is simple. Your eye healthcare provider or technician will ask you to sit up straight while you stare at an object in front of you, which is usually a pen, fixation light, or small picture held 12 and 16 inches away. They will move the object up and down and side to side in an H-shaped pattern.
What are the intrinsic muscles of the eye?
The intrinsic eye muscles include the ciliary muscle, iris sphincter and radial pupil dilator muscles.
What is abduction of the eye?
Rotates the top of the eye towards the nose (intorsion) Moves the eye downwards (depression) Moves the eye outwards (abduction)
Why do my eyes move from side to side?
Nystagmus is a vision condition in which the eyes make repetitive, uncontrolled movements. These movements often result in reduced vision and depth perception and can affect balance and coordination. These involuntary eye movements can occur from side to side, up and down, or in a circular pattern.
Why do my eyes move side to side?
Why are my eyes rapidly side to side?
Nystagmus is a condition whereby a person suffers with involuntary, uncontrollable eye movements. The condition can often make someone’s eyes look like they are shaking, moving quickly either from side to side, up and down, or in a circular motion.
What is extrinsic muscle of the eye?
Extrinsic eye muscles (also called extraocular muscles) are attached to the outside of the eyeball and enable the eyes to move in all directions of sight. There are six extraocular eye muscles and one muscle that controls movement in the upper eyelid.
How many intrinsic muscles move the eye?
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.
Which eye muscles turn the eye laterally?
Due to its unique path, the superior oblique, when activated, pulls the eye downward and laterally. The last muscle is the inferior oblique, which originates at the lower front of the nasal orbital wall, and passes under the LR to insert on the lateral, posterior part of the globe. Thus, the inferior oblique pulls the eye upward and laterally.
What nerve causes lateral movement of the eye?
The abducens nerve controls the movement of a single muscle, the lateral rectus muscle of the eye. In most other mammals it also innervates the musculus retractor bulbi, which can retract the eye for protection. Homologous abducens nerves are found in all vertebrates except lampreys and hagfishes. See also
What causes eye muscle problems?
Eye muscle problems can be from: A problem with the nerves that control them. Myasthenia gravis , an autoimmune illness that stops nerves from telling the muscles what to do. Early signs include double vision and drooping eyelids. Graves’ disease, a thyroid condition that affects eye muscles.
What muscle controls the eye movement?
The oculomotor nucleus innervates a large majority of the muscles involved in eye movement. It controls the levator palpebrae superioris , which is the muscle that moves the upper eyelid upwards. It also controls several muscles that move the eyeball itself: the superior, medial and inferior rectus muscles and the inferior oblique muscle.