Cavernous Sinus Nerves and Contents Quiz & Flashcards

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Questions and Answers

What is the course of the abducens nerve after entering the cavernous sinus?

Runs along the internal carotid artery (correct)

Exits through the optic canal

Pierces into the jugular foramen

Enters the foramen rotundum

Which extraocular muscle does the abducens nerve supply?

Lateral rectus (correct)

Superior rectus

Inferior oblique

Medial rectus

What is the main function of the lateral rectus muscle when stimulated by the abducens nerve?

Elevates the eye

Abducts the eye (correct)

Adducts the eye

Depresses the eye

In which part of the skull does the abducens nerve enter after moving up the posterior cranial fossa?

Petrous part of temporal bone Signup and view all the answers

Where does the abducens nerve supply the lateral rectus muscle?

Superior orbital fissure Signup and view all the answers

Which dural sinus houses the abducens nerve on its course?

Cavernous sinus Signup and view all the answers

What is the function of the abducens nerve?

Mediate eye movements to the lateral side Signup and view all the answers

Through which structure does the abducens nerve pass within the cavernous sinus?

Dorello's Canal Signup and view all the answers

Where would an aneurysm in the internal carotid artery cause damage to the abducens nerve?

Cavernous Sinus Signup and view all the answers

What is the consequence of 6th nerve palsy?

Unilateral External Strabismus At Rest Signup and view all the answers

Which major artery runs alongside the abducens nerve in the cavernous sinus?

Internal Carotid Artery Signup and view all the answers

What type of damage to the orbital fissure can potentially affect the abducens nerve?

Aneurysm Signup and view all the answers

Which cranial nerve supplies the lateral rectus muscle?

Cranial Nerve VI Signup and view all the answers

What is the result of lesions affecting the abducens nerve?

Inability to move the eye laterally Signup and view all the answers

Which cranial nerve runs through the cavernous sinus along with the internal carotid artery?

Cranial Nerve VI Signup and view all the answers

Which extraocular muscle is affected when the lateral rectus cannot contract?

Medial rectus Signup and view all the answers

Which cranial nerve supplies the superior oblique muscle?

Cranial Nerve IV Signup and view all the answers

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...