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The lateral rectus muscle is one of six or seven extraocular muscles that control eye movements. It is responsible for abduction, or the movement of the eye away from the midline (i.e. the nose), allowing the eyeball to move horizontally in the lateral direction. The lateral rectus muscle is innervated by the abducens nerve (CN VI). Damage to this nerve can result in paralysis of the lateral rectus muscle, a condition called abducens nerve palsy, which can cause horizontal double vision and reduced lateral movement.
| Characteristics | Values |
|---|---|
| Location | Lateral side of the eye in the orbit |
| Type | Extraocular muscle |
| Function | Controls lateral movement of the eyeball, specifically abduction |
| Innervation | Abducens nerve (CN VI) |
| Blood Supply | Muscular branches of the ophthalmic artery, inferior muscular artery, and lacrimal artery |
| Clinical Testing | Patient is asked to look laterally |
| Associated Disorders | Abducens nerve palsy, Duane Syndrome |
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What You'll Learn
- The lateral rectus muscle is innervated by the abducens nerve (CN VI)
- Damage to the abducens nerve can cause abducens nerve palsy
- The lateral rectus muscle is an extraocular muscle of the eye
- It is responsible for abducting the eyeball
- The muscle originates from the common tendinous ring and the sphenoid bone
The lateral rectus muscle is innervated by the abducens nerve (CN VI)
The lateral rectus is a muscle located on the lateral side of the eye in the orbit. It is one of the six or seven extraocular muscles that control the movements of the eye. The lateral rectus muscle is responsible for the lateral movement of the eyeball, specifically abduction. This means that it allows the eye to move horizontally in the lateral direction, moving away from the midline (i.e. the nose).
Abducens nerve palsy results in the eye being unable to move laterally. This can lead to horizontal double vision and reduced lateral movement. The eye will be deviated medially towards the nose due to the unopposed action of the medial rectus muscle. The lateral rectus muscle is the only extraocular muscle innervated by the abducens nerve.
Disorders associated with the lateral rectus muscle include Duane Syndrome, which occurs when the sixth cranial nerve that controls the lateral rectus muscle does not develop properly. This syndrome is believed to be caused by a disturbance of normal embryonic development due to genetic or environmental factors.
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Damage to the abducens nerve can cause abducens nerve palsy
The lateral rectus is an extraocular muscle of the eye that is responsible for abducting the eyeball, allowing it to move horizontally in the lateral direction. The abducens nerve (CN VI), also known as the sixth cranial nerve, is responsible for innervating the lateral rectus muscle. This nerve controls the lateral movement of the eye and originates in the pons, near the seventh cranial nerve.
Damage to the abducens nerve can result in abducens nerve palsy, also known as sixth nerve palsy. This condition is characterised by weakness of the lateral rectus muscle and restricted eye movement. The patient's eye will be unable to move laterally, resulting in horizontal double vision. The specific symptoms and underlying causes of abducens nerve palsy can vary depending on the patient's age and the location of the damage.
In adults, the risk factors for developing abducens nerve palsy can be categorised as vasculopathic or non-vasculopathic. Vasculopathic risk factors are more common in older patients and may include conditions such as diabetes, hypertension, and hypercholesterolemia. Non-vasculopathic causes can be found in both adults and children and may include factors such as trauma, inflammation, or compression. For example, a pituitary tumour or a cyst can compress the abducens nerve, leading to nerve palsy.
In children, the most common risk factors for abducens nerve palsy include increased intracranial pressure, vascular anomalies, and neoplastic disorders. Acquired abducens nerve palsy in childhood can be caused by various factors, including neoplasms, trauma, infection, inflammation, and idiopathic etiologies. Additionally, nontraumatic acquired sixth cranial nerve palsy may be associated with conditions such as elevated intracranial pressure, sinusitis, or certain types of infections.
Overall, damage to the abducens nerve can cause abducens nerve palsy, resulting in weakness of the lateral rectus muscle and impaired eye movement. The specific causes and symptoms can vary depending on the patient's age and the location of the nerve damage.
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The lateral rectus muscle is an extraocular muscle of the eye
The lateral rectus muscle is one of the four straight muscles of the orbit, which are responsible for the movement of the eye in the cardinal directions. These muscles, along with the superior and inferior oblique muscles, belong to the extraocular muscles of the eye. The lateral rectus muscle arises from the common tendinous ring and runs anteriorly and across the lateral part of the orbit to insert at the lateral side of the eyeball.
The lateral rectus muscle is flat and strap-shaped, and is wider in its anterior part. It arises from the lateral part of the common tendinous ring, near the attachments of the medial, lateral, and superior recti muscles. It then runs anteriorly along the lateral wall of the orbit, crossing the tendon of the inferior oblique muscle, and inserts into the temporal side of the eyeball. This insertion is around 6.9mm to 7mm from the corneal limbus.
The lateral rectus muscle is the only extraocular muscle that is innervated by the abducens nerve (CN VI). Damage to this nerve can result in paralysis of the lateral rectus muscle, a condition known as abducens nerve palsy. This can occur due to an expanding lesion such as a tumour or cyst that compresses the abducens nerve or its nucleus. The main symptoms of abducens nerve palsy are reflected in the lateral rectus dysfunction, where the eye is unable to move laterally.
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It is responsible for abducting the eyeball
The lateral rectus muscle is responsible for abducting the eyeball, allowing it to move laterally or horizontally in the lateral direction. This movement involves the eye moving away from the midline (i.e., the nose), causing the pupil to move away from the midline of the body.
The lateral rectus muscle is one of the four straight muscles of the orbit, which are responsible for the movement of the eye in the cardinal directions. These muscles, along with the superior and inferior oblique muscles, are known as extraocular muscles. The lateral rectus muscle is unique among the extraocular muscles as it is the only muscle innervated by the abducens nerve (CN VI).
The lateral rectus muscle originates at the common tendinous ring, also known as the annular tendon or annulus of Zinn, and inserts into the lateral side of the eyeball. It runs anteriorly and across the lateral part of the orbit, inserting about 6.9 to 7 mm from the limbus of the cornea.
Damage to the abducens nerve can result in paralysis of the lateral rectus muscle, known as abducens nerve palsy. This condition can be caused by various factors, including tumours, cysts, or trauma, leading to elevated intracranial pressure. As a result of this damage, the eye may experience horizontal double vision and reduced lateral movement, with the patient being unable to abduct the eye fully.
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The muscle originates from the common tendinous ring and the sphenoid bone
The lateral rectus muscle is one of the four straight muscles of the orbit, responsible for the movement of the eye in the cardinal directions. It is also one of the six or seven extraocular muscles that control eye movements. These muscles work in synergy or opposition with other extrinsic muscles of the eye to produce coordinated movements and direct the gaze. The lateral rectus muscle originates from the common tendinous ring, also known as the annulus of Zinn, and the sphenoid bone.
The common tendinous ring is a tendinous ring that surrounds the optic nerve and serves as the origin for five of the seven extraocular muscles, excluding the inferior oblique muscle and levator palpebrae superioris. The lateral rectus muscle arises from the lateral part of the common tendinous ring and runs anteriorly and across the lateral part of the orbit to insert at the lateral side of the eyeball. The muscle inserts anterior to the equator of the eyeball, about 6.9 to 7 mm from the limbus of the cornea.
In addition to the common tendinous ring, a small slip of the lateral rectus muscle arises from a spine on the greater wing of the sphenoid bone. The sphenoid bone is a single bone located at the base of the skull. It is a complex bone with many features, including the sphenoidal sinuses, superior orbital fissures, and optic canals. The lateral rectus muscle arises from the greater wing of the sphenoid bone, specifically from a spine on its lateral surface.
The lateral rectus muscle is a flat strap-shaped muscle that is wider in its anterior part. It is located in the eye and is responsible for the lateral movement of the eye, specifically abduction. Abduction describes the movement of the eye away from the midline (i.e. the nose), allowing the eyeball to move horizontally in the lateral direction and bringing the pupil away from the midline of the body. The lateral rectus muscle works in conjunction with other extraocular muscles to enable the eye to move in every direction.
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Frequently asked questions
The lateral rectus muscle is a muscle located in the eye that is responsible for the lateral movement of the eye, or abduction of the eyeball.
The lateral rectus muscle is innervated by the abducens nerve (CN VI).
Damage to the lateral rectus muscle can result in paralysis of the muscle, a condition known as abducens nerve palsy. This can cause the eye to be unable to move laterally and result in horizontal double vision.
Duane Syndrome is a disorder associated with the lateral rectus muscle. It occurs when the sixth cranial nerve, which controls the lateral rectus muscle, does not develop properly.
