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Questions and Answers
What is the course of the abducens nerve after entering the cavernous sinus?
What is the course of the abducens nerve after entering the cavernous sinus?
Which extraocular muscle does the abducens nerve supply?
Which extraocular muscle does the abducens nerve supply?
What is the main function of the lateral rectus muscle when stimulated by the abducens nerve?
What is the main function of the lateral rectus muscle when stimulated by the abducens nerve?
In which part of the skull does the abducens nerve enter after moving up the posterior cranial fossa?
In which part of the skull does the abducens nerve enter after moving up the posterior cranial fossa?
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Where does the abducens nerve supply the lateral rectus muscle?
Where does the abducens nerve supply the lateral rectus muscle?
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Which dural sinus houses the abducens nerve on its course?
Which dural sinus houses the abducens nerve on its course?
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What is the function of the abducens nerve?
What is the function of the abducens nerve?
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Through which structure does the abducens nerve pass within the cavernous sinus?
Through which structure does the abducens nerve pass within the cavernous sinus?
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Where would an aneurysm in the internal carotid artery cause damage to the abducens nerve?
Where would an aneurysm in the internal carotid artery cause damage to the abducens nerve?
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What is the consequence of 6th nerve palsy?
What is the consequence of 6th nerve palsy?
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Which major artery runs alongside the abducens nerve in the cavernous sinus?
Which major artery runs alongside the abducens nerve in the cavernous sinus?
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What type of damage to the orbital fissure can potentially affect the abducens nerve?
What type of damage to the orbital fissure can potentially affect the abducens nerve?
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Which cranial nerve supplies the lateral rectus muscle?
Which cranial nerve supplies the lateral rectus muscle?
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What is the result of lesions affecting the abducens nerve?
What is the result of lesions affecting the abducens nerve?
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Which cranial nerve runs through the cavernous sinus along with the internal carotid artery?
Which cranial nerve runs through the cavernous sinus along with the internal carotid artery?
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Which extraocular muscle is affected when the lateral rectus cannot contract?
Which extraocular muscle is affected when the lateral rectus cannot contract?
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Which cranial nerve supplies the superior oblique muscle?
Which cranial nerve supplies the superior oblique muscle?
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Study Notes
Abducens Nerve Pathway
- Enters cavernous sinus after traveling through the posterior cranial fossa.
- Passes through the cavernous sinus, positioned between the internal carotid artery and the dural wall.
- Follows a route alongside the internal carotid artery within the cavernous sinus.
Innervation and Function
- Supplies the lateral rectus muscle, which is responsible for eye abduction.
- The lateral rectus muscle's main function is to move the eye laterally when stimulated by the abducens nerve.
- 6th nerve palsy results in weakness of the lateral rectus, causing the affected eye to deviate medially.
Anatomical Relationships
- The abducens nerve traverses the cavernous sinus adjacent to the internal carotid artery.
- Lies within the cavernous sinus, housed in the superior part of the dural sinus.
- An aneurysm in the internal carotid artery can compress the abducens nerve, leading to dysfunction.
Lesions and Palsies
- Damage to the orbital fissure can potentially affect the abducens nerve, often associated with trauma.
- Lesions affecting the abducens nerve result in impaired lateral movement of the eye.
Other Relevant Cranial Nerves
- The trochlear nerve (CN IV) innervates the superior oblique muscle.
- The oculomotor nerve (CN III) is responsible for supplying other extraocular muscles excluding the lateral rectus.
Clinical Implications
- In cases of abducens nerve dysfunction, the inability to contract the lateral rectus results in diplopia (double vision) due to misalignment of the eyes.
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Description
Test your knowledge about the nerves running through the cavernous sinus, including CN III, CN IV, CN V1, and CN V2. Learn about LR6, SO4, ATR3 mnemonic for nerve supply. Figure 5.Contents of the Cavernous Sinus and its wall 2 of 4 NEURO PHYSIOL...
