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The eyelid is supplied by three cranial nerves (III, V, VII) and sympathetic nerve fibres. The oculomotor nerve (CNIII) is the primary nerve responsible for controlling the movement and position of the eyelid. It innervates the levator palpebrae superiorus, the main upper eyelid retractor, and the orbicularis oculi, which is responsible for eyelid closure. The trigeminal nerve (CN V) also plays a role in eyelid function, providing sensory innervation to the eyelid and triggering blinking. The facial nerve (CNVII) is involved in eyelid twitching and blinking, and it supports eyelid protraction.
| Characteristics | Values |
|---|---|
| Nerves controlling eyelid muscles | Cranial nerve VII (the facial nerve), cranial nerve III (the oculomotor nerve), cranial nerve V (the trigeminal nerve), and sympathetic nerve fibers |
| Function of the oculomotor nerve | Controls the main muscle that lifts the upper eyelid and the muscle that constricts or shrinks the pupil |
| Function of the facial nerve | Controls eyelid closure and eyelid twitching |
| Function of the trigeminal nerve | Supplies somatosensory innervation to the eyelid |
| Function of the sympathetic nerve fibers | Contribute to upper eyelid retraction and minor function in eyelid retraction |
| Pathologies | Thrombosis, pituitary tumors, carotid-cavernous fistula, infections, cranial nerve III palsy, cranial nerve VII palsy |
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What You'll Learn
The cranial nerve that controls eyelid muscles is CNIII (oculomotor nerve)
The eyelid is supplied by three cranial nerves: CNIII (oculomotor nerve), CNV (trigeminal nerve), and CNVII (facial nerve). The oculomotor nerve (CNIII) is the third cranial nerve and controls the eyelid muscles. It provides motor and parasympathetic innervation to some of the ocular structures. The superior branch of the oculomotor nerve provides motor innervation to the levator palpebrae superioris, which raises the upper eyelid. The inferior division of CNIII also innervates the inferior rectus muscle, causing lower eyelid retraction.
The oculomotor nerve originates from the oculomotor nucleus, located within the midbrain of the brainstem, and emerges from the anterior aspect of the midbrain. It passes inferiorly to the posterior cerebral artery and superiorly to the superior cerebellar artery. The nerve then pierces the dura mater and enters the lateral aspect of the cavernous sinus, where it receives sympathetic branches from the internal carotid plexus. These fibres travel within the sheath of the oculomotor nerve.
The oculomotor nerve plays a crucial role in controlling eyelid movement and position. When this nerve is damaged, it can result in a condition called palsy, which can be total or partial. Symptoms of palsy include double vision, pupil constriction to light, and weakness of the eyelid muscle. In some cases, infants are born with cranial nerve III palsy, and many patients experience spontaneous recovery within 6-8 months. If symptoms persist beyond this period, surgery on the eye muscles may be considered.
In addition to the oculomotor nerve, the trigeminal nerve (CNV) also plays a role in eyelid innervation. It supplies somatosensory innervation to the eyelid through its ophthalmic (V1) and maxillary (V2) divisions. The ophthalmic division provides sensory innervation to the upper eyelid, while the maxillary division supplies the lower eyelid. The facial nerve (CNVII) is responsible for eyelid closure and innervates the orbicularis oculi muscle, which is the agonist for lid closure.
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The facial nerve (CNVII) controls eyelid protraction
The eyelid is supplied by three cranial nerves: the oculomotor nerve (CNIII), the trigeminal nerve (CNV), and the facial nerve (CNVII). The oculomotor nerve is responsible for controlling the movement and position of the eyelid. It innervates the levator palpebrae superiorus, the main upper eyelid retractor, and the superior tarsal muscle, which helps to raise the eyelid.
The trigeminal nerve supplies somatosensory innervation to the eyelid via its ophthalmic (V1) and maxillary (V2) divisions. The ophthalmic division supplies the upper eyelid as the lacrimal, supraorbital, and supratrochlear nerves, and the medial aspect of both upper and lower eyelids as the infratrochlear nerve. The maxillary division supplies the lower eyelid as the zygomaticofacial and infraorbital nerves.
The facial nerve (CNVII) innervates the orbicularis oculi, frontalis, procerus, and corrugator supercilii muscles, and supports eyelid protraction. The orbicularis oculi is the agonist for lid closure. The temporal and zygomatic branches of the facial nerve supply the orbicularis oculi, the main eyelid protractor. The facial nerve also supplies the corrugator supercilii and the procerus, which contribute to brow depression and secondarily contribute to upper eyelid protraction.
In addition to these cranial nerves, sympathetic nerve fibers also play a role in eyelid function. These fibers contribute to upper eyelid retraction by innervating the superior tarsal muscle (also known as Müller's muscle) and the inferior tarsal muscle, which contributes to lower eyelid retraction. They also have a minor function in eyelid retraction and sweat glands in the forehead.
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The oculomotor nerve controls pupil constriction
The eyelid muscle is innervated by three cranial nerves (III, V, VII) and sympathetic nerve fibres. The oculomotor nerve (CNIII) is one of these three nerves that innervate the eyelid muscle. It provides motor and parasympathetic innervation to some of the ocular structures.
The parasympathetic nervous system causes pupillary constriction through a process called miosis. When the oculomotor nerve is damaged, patients lose their pupillary constriction to light and the strength of the eyelid muscle. This condition is called palsy, which can be total or partial. It can be caused by a tumour, an inflammatory disorder, trauma, stroke, or it can be idiopathic.
The oculomotor nerve also innervates the levator palpebrae superioris, which raises the upper eyelid. There are sympathetic fibres that travel with the superior branch of the oculomotor nerve. These fibres innervate the superior tarsal muscle, which helps to keep the eyelid elevated.
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The trigeminal nerve (CN V1) supplies sensory innervation to the eyelid
The eyelid is a muscle innervated by three cranial nerves (III, V, VII) and sympathetic nerve fibres. The trigeminal nerve (CN V1) supplies sensory innervation to the eyelid. The ophthalmic division (V1) arises from the anterior aspect of the trigeminal ganglion, and its sensory supply to the eyelid terminates as the lacrimal, supraorbital, and supratrochlear nerves supplying the upper eyelid. The ophthalmic branch of the trigeminal nerve provides sensory innervation to the eye. The ophthalmic branch of the trigeminal nerve works as the afferent part of the corneal and lacrimation reflex. The facial nerve is the efferent part of the corneal and lacrimation reflex.
The eyelid muscle is responsible for controlling the movement and position of the eyelid. The oculomotor nerve (CN III) provides motor and parasympathetic innervation to some of the ocular structures. The oculomotor nerve originates from the oculomotor nucleus, located within the midbrain of the brainstem, and emerges from the anterior aspect of the midbrain. The nerve then pierces the dura mater and enters the lateral aspect of the cavernous sinus. Within the cavernous sinus, it receives sympathetic branches from the internal carotid plexus.
The oculomotor nerve innervates many of the extraocular muscles, which move the eyeball and upper eyelid. The superior branch of the oculomotor nerve provides motor innervation to the superior rectus and levator palpabrae superioris. The levator palpabrae superioris raises the upper eyelid. Sympathetic fibres travel with the superior branch of the oculomotor nerve and innervate the superior tarsal muscle, which helps to keep the eyelid elevated.
The orbicularis oculi muscle, a striated muscle under the control of the facial nerve (CN VII), is the agonist for lid closure. Activation of the orbicularis oculi muscle and inhibition of the levator palpebrae superioris muscle result in eyelid closure. The preseptal portion of the orbicularis oculi muscle is responsible for voluntary eyelid closure, while the pretarsal orbicularis oculi muscle is responsible for involuntary eyelid closure.
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The superior tarsal muscle helps to raise the eyelid
The eyelid is supplied by three cranial nerves (III, V, VII) and sympathetic nerve fibres. The superior tarsal muscle, also known as the Müller muscle, is an accessory smooth muscle that helps to raise the upper eyelid. It originates on the underside of the levator palpebrae superioris muscle and inserts onto the superior tarsal plate of the eyelid.
The superior tarsal muscle receives its innervation from the sympathetic nervous system. Postganglionic sympathetic fibres originate in the superior cervical ganglion and travel via the internal carotid plexus, where small branches communicate with the oculomotor nerve as it passes through the cavernous sinus. The oculomotor nerve is a cranial nerve (III) that innervates the main upper eyelid retractor, the levator palpebrae superiorus, via its superior branch. The superior tarsal muscle acts synergistically with the levator palpebrae superioris to raise the upper eyelid.
The superior tarsal muscle has a unique function in assisting the levator palpebrae superioris by maintaining upper eyelid elevation after being raised by the levator palpebrae superioris. It lifts the upper eyelid by an additional 2 mm beyond the range of the levator palpebrae superioris, following a sympathetic nervous system response. This synergistic interaction between the superior tarsal muscle and the levator palpebrae superioris is important for maintaining proper eyelid function.
Damage to the superior tarsal muscle can result in a drooping eyelid, a condition known as ptosis or blepharoptosis. This can be corrected through surgical procedures such as Müller muscle-conjunctival resection or levator advancement/resection. These surgeries involve carefully manipulating the muscles and surrounding structures to restore normal eyelid function and appearance.
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Frequently asked questions
The eyelid muscle is innervated by the oculomotor nerve (CNIII), which controls the movement and position of the eyelid.
Oculomotor nerve palsy is a condition where the nerve is damaged, causing double vision and the loss of the ability to control the eyelid and pupil.
The trigeminal nerve (CN V) supplies somatosensory innervation to the eyelid and eye via its ophthalmic (V1) and maxillary (V2) divisions.
Eyelid twitching, or myokymia, is caused by irritation along the seventh cranial nerve, the facial nerve. This can be triggered by excessive screen time, dry eyes, stress, dehydration, or a lack of sleep.
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