Question:
Which eye-ball muscles are innervated by abducent nerve?
Which eye-ball muscles are innervated by abducent nerve?
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A useful mnemonic for extraocular muscle innervation is:
- $\text{SO}_4$: Superior/Dorsal Oblique by CN IV.
- $\text{LR}_6 + \text{RO}_6$: Lateral Rectus and Retractor Oculi by CN VI.
- All others are innervated by CN III.
- $\text{SO}_4$: Superior/Dorsal Oblique by CN IV.
- $\text{LR}_6 + \text{RO}_6$: Lateral Rectus and Retractor Oculi by CN VI.
- All others are innervated by CN III.
Updated On: Aug 24, 2026
- Ventral rectus and medial rectus
- Lateral rectus and retractor oculi
- Retractor oculi and dorsal rectus
- Dorsal oblique and ventral oblique
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The extraocular muscles of the eye are responsible for moving the eyeball. They are innervated by three cranial nerves: the oculomotor nerve (CN III), the trochlear nerve (CN IV), and the abducent nerve (CN VI).
Step 2: Detailed Explanation:
Let us review the innervation of the extraocular muscles in domestic animals:
- The trochlear nerve (CN IV) innervates the dorsal oblique muscle.
- The abducent nerve (CN VI) innervates the lateral rectus muscle and, in domestic animals that possess it, the retractor oculi muscle.
- The oculomotor nerve (CN III) innervates all the remaining extraocular muscles: the dorsal rectus, ventral rectus, medial rectus, and ventral oblique muscles.
Therefore, the lateral rectus and retractor oculi are innervated by the abducent nerve.
Step 3: Final Answer
The correct option is (B).
The extraocular muscles of the eye are responsible for moving the eyeball. They are innervated by three cranial nerves: the oculomotor nerve (CN III), the trochlear nerve (CN IV), and the abducent nerve (CN VI).
Step 2: Detailed Explanation:
Let us review the innervation of the extraocular muscles in domestic animals:
- The trochlear nerve (CN IV) innervates the dorsal oblique muscle.
- The abducent nerve (CN VI) innervates the lateral rectus muscle and, in domestic animals that possess it, the retractor oculi muscle.
- The oculomotor nerve (CN III) innervates all the remaining extraocular muscles: the dorsal rectus, ventral rectus, medial rectus, and ventral oblique muscles.
Therefore, the lateral rectus and retractor oculi are innervated by the abducent nerve.
Step 3: Final Answer
The correct option is (B).
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