Question:
Nerve block for enucleation of eyeball in cattle is
Nerve block for enucleation of eyeball in cattle is
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Bovine Eye Nerve Blocks:
Enucleation Exenteration of Eyeball $\rightarrow$ RETROBULBAR Block Peterson's Block (CN II, III, IV, V, VI).
Dehorning $\rightarrow$ Cornual Nerve Block.
Enucleation Exenteration of Eyeball $\rightarrow$ RETROBULBAR Block Peterson's Block (CN II, III, IV, V, VI).
Dehorning $\rightarrow$ Cornual Nerve Block.
Updated On: Sep 7, 2026
- Paravertebral
- Retrobulbar
- Supra orbital
- Cornual
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Regional ophthalmic anesthesia for transpalpebral enucleation and exenteration of the bovine orbit.
Step 2: Detailed Explanation:
Ophthalmic regional nerve blocks in cattle:
1. Retrobulbar Nerve Block (Peterson's Eye Block 4-Point Retrobulbar Block): Injects local anesthetic (e.g., $15 - 20\text{ mL}$ of $2\%$ lignocaine) into the retrobulbar cone at the orbito-rotundum foramen, desensitizing the optic nerve (CN II), oculomotor (CN III), trochlear (CN IV), ophthalmic/maxillary branches of trigeminal (CN V), and abducent (CN VI). This induces complete sensory anesthesia, globe immobility (akinesia), and mydriasis, which is strictly essential for enucleation extirpation of the eyeball (e.g., in advanced ocular squamous cell carcinoma).
2. Cornual Block: For dehorning.
3. Supraorbital Block: Motor block of upper eyelid.
Step 3: Final Answer:
Thus, the nerve block for enucleation of the eyeball is Retrobulbar, matching option (B).
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