Logan Steele
The lateral rectus is one of four rectus muscles in the eye, alongside the superior rectus, inferior rectus, and medial rectus. The lateral rectus muscle moves the eye laterally. This muscle is supplied by the superior branch of the ophthalmic artery and is innervated by the abducens nerve (cranial nerve VI). A lesion of the abducens nerve will paralyse the lateral rectus muscle, causing the affected eye to be displaced laterally.
| Characteristics | Values |
|---|---|
| Name | Lateral Rectus Muscle |
| Function | Elevates, abducts and laterally rotates the eyeball |
| Innervation | Abducens nerve (CN VI) |
| Blood Supply | Ophthalmic artery (superior branch) and Lacrimal artery |
| Related Conditions | A-pattern and V-pattern strabismus |
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What You'll Learn
- The lateral rectus muscle is supplied by the abducens nerve (CN VI)
- The superior oblique muscle is supplied by the trochlear nerve (CN IV)
- The medial rectus is supplied by the inferior branch of the ophthalmic artery
- The lateral rectus is also supplied by the lacrimal artery
- The superior rectus is supplied by the superior branch of the ophthalmic artery
The lateral rectus muscle is supplied by the abducens nerve (CN VI)
The lateral rectus is one of the four rectus muscles, along with the superior rectus, inferior rectus, and medial rectus. These muscles are responsible for eye movement and originate from the common tendinous ring, a ring of fibrous tissue that surrounds the optic canal at the back of the orbit. From their origin, the muscles pass anteriorly to attach to the sclera of the eyeball.
The lateral rectus muscle, specifically, is responsible for abducting the eyeball, or moving it laterally. This muscle is supplied by the abducens nerve (CN VI), also known as the cranial nerve VI. A lesion of the CN VI will paralyse the lateral rectus muscle, causing the affected eye to be adducted by the resting tone of the medial rectus muscle. This condition is known as oculomotor nerve palsy and is characterised by a ""down and out" dilated pupil with ipsilateral ptosis.
The arterial supply to the extraocular muscles, including the lateral rectus muscle, comes from the muscular branches of the ophthalmic artery. The ophthalmic artery has a small superior branch and a large inferior branch. The superior branch supplies the lateral rectus muscle, while the inferior branch supplies the medial, inferior rectus, and inferior oblique muscles. The lateral rectus muscle also receives a partial supply from the lacrimal artery.
The innervation of the lateral rectus muscle is an important aspect of eye anatomy and function. The abducens nerve (CN VI) plays a crucial role in allowing the lateral rectus muscle to abduct the eyeball and enable lateral eye movement. Damage to this nerve can have significant impacts on eye function and overall health.
In summary, the lateral rectus muscle is responsible for abducting the eyeball and enabling lateral eye movement. It is supplied by the abducens nerve (CN VI) and plays a crucial role in maintaining normal eye function and gaze.
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The superior oblique muscle is supplied by the trochlear nerve (CN IV)
The trochlear nerve, also known as the cranial nerve 4 or CN IV, is a motor nerve that controls the superior oblique muscle. This nerve is responsible for sending signals from the brain to the muscles that control eye movement. There are two trochlear nerves, one for each eye, and they are one of 12 sets of cranial nerves.
The trochlear nerve gets its name from the Latin word "trochleae," which means "pulley." A pulley is a device that helps lift and lower an object. The superior oblique muscle, which the trochlear nerve controls, is connected to the eye near the top of it. This muscle goes through a sling of connective tissue that acts as a pulley.
The trochlear nerve is relatively long, starting in the brainstem and passing through four areas before reaching the superior oblique muscle near the top of the eyeball. The trochlear nerve innervates the superior oblique muscle, which is a muscle of oculomotion. This means that it helps to move the eye. The superior oblique muscle depresses and abducts the eyeball, allowing the eye to look down and toward or away from the nose.
Damage to the trochlear nerve will likely affect eye movement and vision. Common signs of trochlear nerve damage, also known as fourth nerve palsy or trochlear nerve palsy, include double vision (diplopia) and tilting the head to compensate for eye movement or vision challenges.
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The medial rectus is supplied by the inferior branch of the ophthalmic artery
The medial rectus is one of the six extraocular muscles located in the orbit. These muscles are responsible for controlling eye movements, maintaining proper eye alignment, and moving the upper eyelids. The medial rectus muscle runs superior to the floor of the orbit and inferior to the superior oblique muscle, ophthalmic artery, and nasociliary nerve. The ophthalmic artery, a branch of the internal carotid artery, supplies blood to the medial rectus. Specifically, it is the inferior branch of the ophthalmic artery that supplies the medial rectus, along with the inferior rectus, and inferior oblique muscles.
The inferior branch of the oculomotor nerve traverses the space enclosed by the lateral surface of the medial rectus muscle and the posteromedial surface of the eye and optic nerve. This nerve innervates the medial rectus muscle, allowing for voluntary control over it. A lesion of the oculomotor nerve can cause paralysis of the medial rectus, leading to a divergence of the affected eye towards the pull of the lateral rectus muscle, resulting in lateral movement.
The medial rectus muscle adducts the eyeball, pulling it medially when contracting. It originates from the common tendinous ring, a ring of fibrous tissue surrounding the optic canal at the back of the orbit, and attaches to the medial side of the anterior half of the eyeball.
Weakness of the medial rectus muscle can occur due to various reasons, including oculomotor nerve palsy, oculomotor nucleus injury, impaired neuromuscular transmission, localized diseases affecting the muscle, systemic diseases affecting ocular muscles, and secondary diseases affecting the muscle.
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The lateral rectus is also supplied by the lacrimal artery
The lateral rectus is an extraocular muscle of the eye that moves the eye laterally, or side to side. It is one of the four rectus muscles, along with the superior rectus, inferior rectus, and medial rectus. These muscles originate from the common tendinous ring, which is a ring of fibrous tissue surrounding the optic canal at the back of the orbit. From its origin, the lateral rectus muscle runs anteriorly and across the lateral part of the orbit to insert at the lateral side of the eyeball.
The lateral rectus muscle is responsible for abducting the eyeball, or moving it away from the nose and towards the ear. This movement is assisted by the superior and inferior oblique muscles. The lateral rectus muscle is supplied by the ophthalmic artery, which is a branch of the internal carotid artery. The ophthalmic artery supplies the lateral rectus muscle directly or through its lacrimal branch, also known as the lacrimal artery.
The lacrimal artery runs along the superior border of the lateral rectus muscle to supply the lacrimal gland. The blood vessels that supply the lateral rectus muscle also provide blood to half of the anterior segment of the eye, specifically the nasal half. This is important for surgeons to consider during eye surgery, as damage to the blood supply can occur.
The lateral rectus muscle is the only muscle supplied by cranial nerve VI, also known as the abducens nerve. If this nerve is damaged, the lateral rectus muscle can become paralysed, weak, and stop moving, resulting in a condition called abducens nerve palsy or sixth nerve palsy. This can cause symptoms such as double vision and an eye turn, and it may indicate underlying neurological abnormalities or serious conditions such as a brain tumour.
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The superior rectus is supplied by the superior branch of the ophthalmic artery
The superior rectus is one of the six extraocular muscles that control eye movements. The primary action of the superior rectus is to elevate the eye. It also contributes to adduction and medial rotation of the eyeball. The superior rectus is closely related to the levator palpebrae superioris, which is responsible for the elevation of the eyelid. The muscle runs parallel and immediately superior to the levator palpebrae superioris.
The superior rectus is innervated by the superior division of the oculomotor nerve (CN III). The oculomotor nerve plays a crucial role in eye movements and supplies several extraocular muscles. When a physician tests eye movements by asking a patient to follow their finger laterally and then superiorly in an "H-shape," the superior rectus muscle and the oculomotor nerve are directly assessed.
The oculomotor nerve has two divisions: superior and inferior. The superior division innervates the superior rectus muscle, while the inferior division innervates the medial rectus, inferior rectus, and inferior oblique muscles. Lesions affecting the oculomotor nerve can cause paralysis of the respective muscles, altering the resting gaze of the affected eye.
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Frequently asked questions
The lateral rectus muscle moves the eye laterally.
The lateral rectus muscle abducts the eyeball.
The abducens nerve (CN VI) innervates the lateral rectus muscle.
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