Maximus Gage
The lateral rectus is a flat strap-shaped muscle that is one of the six or seven extraocular muscles that control eye movements. It is responsible for abduction, or outward movement, of the eye. The lateral rectus is the only muscle supplied by the abducens nerve (CN VI), which enters its medial surface and provides general somatic efferent fibres. Damage to the abducens nerve can result in paralysis of the lateral rectus muscle, a condition called abducens nerve palsy.
| Characteristics | Values |
|---|---|
| Type | Extraocular muscle |
| Number of muscles | 1 |
| Origin | Mesoderm |
| Blood supply | Ophthalmic artery, branches of the inferior muscular artery, and the lacrimal artery |
| Innervation | Abducens nerve (CN VI) |
| Function | Abduction of the eyeball, outward movement of the eye |
| Associated disorders | Lateral rectus palsy, Duane Syndrome, abducens nerve palsy, myositis |
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What You'll Learn
The lateral rectus is supplied by the abducens nerve (CN VI)
The lateral rectus is a muscle in the orbit (eye) that controls eye movement. It is one of the six extraocular muscles that control eye movements. These muscles coordinate the complex and quick movements of the eye. The lateral rectus is the only muscle supplied by the abducens nerve (CN VI). The neuron cell bodies are located in the abducens nucleus in the pons. These neurons project axons as the abducens nerve, which exit from the pontomedullary junction of the brainstem, travel through the cavernous sinus, and enter the orbit through the superior orbital fissure. It then enters the medial surface of the lateral rectus to innervate it.
The lateral rectus muscle is supplied by branches of the abducens nerve (CN VI), which enter its medial surface and provide general somatic efferent fibres. The abducens nerve is also known as cranial nerve VI. The lateral rectus muscle is supplied by the ophthalmic artery, which stems from the internal carotid artery. The ophthalmic artery supplies it either directly or through its lacrimal branch. The lacrimal nerve and artery run along the superior border of the lateral rectus muscle. The ciliary ganglion, the abducens nerve, and the ophthalmic artery lie medial to the lateral rectus between it and the optic nerve.
The lateral rectus muscle originates in the bottom of the orbital cavity in the surrounding area of the optic canal, specifically in the lateral part of the common tendinous ring; the annulus of Zinn. Almost every extraocular muscle originates in the annulus of Zinn, excluding the inferior oblique muscle and levator palpebrae superioris. The lateral rectus is a flat strap-shaped muscle that is wider in its anterior part. 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.
Damage to the abducens nerve (CN VI) can result in paralysis of the lateral rectus muscle, a condition called abducens nerve palsy. This condition can occur from an expanding lesion such as a tumour or a cyst that compresses the abducens nerve itself or its nucleus. The main symptoms of abducens nerve palsy are reflected in the lateral rectus dysfunction, in which the eye is unable to move laterally. Since the abducens nerve only innervates the lateral rectus, other extraocular muscles will not be affected. Therefore, the muscle that is functionally antagonistic to the lateral rectus will overpower it and pull the eyeball to their side.
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It abducts the eye, turning it laterally
The lateral rectus is one of the four straight muscles of the orbit that is responsible for the movement of the eye. It is also one of the six or seven extraocular muscles that control eye movements. The lateral rectus muscle is supplied by branches of the abducens nerve (CN VI), which enter its medial surface and provide general somatic efferent fibres. It is the only muscle supplied by the abducens nerve.
The lateral rectus muscle abducts the eye, turning it laterally in the orbit. This is also known as outward movement. It works in synergy or opposition with other extrinsic muscles of the eye, such as the superior and inferior oblique muscles, to produce coordinated movements and direct the gaze. 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 primary function of the lateral rectus is abduction, or outward movement, of the eye. To test for proper function of the lateral rectus, a patient is asked to look laterally. If lateral movement of the eye is limited or painful, it may be indicative of injury or dysfunction of the lateral rectus.
Damage to the abducens nerve can result in paralysis of the lateral rectus muscle, a condition known as abducens nerve palsy. This can be caused by a lesion, 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. This results in horizontal double vision and reduced lateral movement.
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It is one of six extraocular muscles
The lateral rectus is one of six extraocular muscles that control eye movements. It is responsible for abduction, or the outward movement of the eye. The lateral rectus muscle abducts the eye and directs the gaze laterally in the horizontal plane. This movement is assisted by the superior and inferior oblique muscles, which also abduct the eyes among their other functions. The lateral rectus muscle is the only muscle supplied by the abducens nerve (CN VI), which enter its medial surface and provide general somatic efferent fibres. The ophthalmic artery, a branch of the internal carotid artery, supplies the lateral rectus muscle either directly or through its lacrimal branch.
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. 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 primary action of the lateral rectus muscle is the abduction of the eyeball. It works in synergy or opposition with other extrinsic muscles of the eye to produce coordinated movements and direct the gaze.
The extraocular muscles include four rectus muscles (medial, lateral, superior, and inferior rectus), two oblique muscles (superior and inferior), and levator palpebrae superioris. The lateral rectus muscle originates in the bottom of the orbital cavity in the surrounding area of the optic canal, specifically in the lateral part of the common tendinous ring; the annulus of Zinn. Almost every extraocular muscle originates in the annulus of Zinn, excluding the inferior oblique muscle and levator palpebrae superioris. The lateral rectus is a flat-shaped muscle, wider in its anterior part.
Damage to the abducens nerve (CN VI) can result in paralysis of the lateral rectus muscle, a condition called abducens nerve palsy. This condition can occur from an expanding lesion such as a tumour or a cyst that compresses the abducens nerve itself or its nucleus. The main symptoms of abducens nerve palsy are reflected in the lateral rectus dysfunction, in which the eye is unable to move laterally. Since the abducens nerve only innervates the lateral rectus, other extraocular muscles will not be affected. Therefore, the muscle that is functionally antagonistic to the lateral rectus will overpower it and pull the eyeball to their side.
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It arises from the common tendinous ring
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. The lateral rectus muscle arises from the common tendinous ring, also known as the annulus of Zinn, and runs anteriorly and across the lateral part of the orbit to insert at the lateral side of the eyeball. The annulus of Zinn is located at the apex of the orbit that surrounds the optic canal. The origin of the lateral rectus muscle is specifically in the lateral part of the common tendinous ring, at the bottom of the orbital cavity in the surrounding area of the optic canal.
The common tendinous ring is a structure that provides a point of origin for several muscles, including the lateral rectus muscle. It is a fibrous ring that surrounds the optic canal and is located at the apex of the orbit. The common tendinous ring is also known as the annulus of Zinn, named after the German anatomist Johann Gottfried Zinn.
The lateral rectus muscle is a flat strap-shaped muscle that is wider in its anterior part. It is one of the six extraocular muscles that control eye movements. These muscles, along with the superior and inferior oblique muscles, belong to the extraocular muscles of the eye. The primary action of the lateral rectus muscle is the abduction of the eyeball, which involves moving the eye laterally or side to side.
The lateral rectus muscle works in synergy or opposition with other extrinsic muscles of the eye to produce coordinated movements and direct the gaze. It is unique among the extraocular muscles in being supplied by the abducens nerve (CN VI). The abducens nerve enters the medial surface of the lateral rectus to innervate it. The insertion of the lateral rectus muscle is located around 8 mm from the insertion of the inferior rectus muscle, 7 mm from the insertion of the superior rectus muscle, and 10 mm from the corneal limbus.
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Lateral rectus palsy can be caused by trauma or a tumour
The lateral rectus is one of the six extraocular muscles that control eye movements. It is responsible for abduction, turning the eye laterally in the orbit. The lateral rectus is unique in that it is the only muscle supplied by the abducens nerve (CN VI).
The abducens nerve controls the lateral rectus muscle, and damage to it can result in paralysis of the lateral rectus muscle, a condition known as abducens nerve palsy. This palsy can be caused by a lesion, such as a tumour or cyst, that compresses the abducens nerve or its nucleus. The nerve can be damaged at any point from the pons to the lateral rectus muscle, resulting in sixth nerve palsy. This damage can also be caused by trauma, which can take the form of any injury that causes elevated intracranial pressure, including hydrocephalus, traumatic brain injury with intracranial bleeding, and lesions along the nerve.
Trauma is a common cause of abducens nerve palsy in children, and it can also be caused by neoplasms. The incidence rate of sixth nerve palsy caused by traumatic means ranges from 3% to 30%. The prognosis for lateral rectus palsy caused by trauma or a tumour is generally poor, as nerves do not regenerate or heal well. If the damage is severe, there will be permanent damage.
Abducens nerve palsy can cause horizontal double vision and reduced lateral movement. The patient will be unable to abduct the eye, and the eye will be deviated medially towards the nose due to the unopposed action of the medial rectus. This condition poses significant challenges in patient care and requires careful evaluation to rule out serious underlying causes.
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Frequently asked questions
The lateral rectus is a flat strap-shaped muscle that is wider in its anterior part. It is one of the six or seven extraocular muscles that control eye movements.
The primary function of the lateral rectus muscle is the abduction of the eyeball, or outward movement, of the eye. It works in synergy or opposition with other extrinsic muscles of the eye to produce coordinated movements and direct the gaze.
The lateral rectus is the only muscle supplied by the abducens nerve (CN VI) and branches of the ophthalmic artery.
Damage to the lateral rectus muscle can result in paralysis of the muscle, known as abducens nerve palsy. This can cause horizontal double vision and reduced lateral movement.
