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This Concept Map, created with IHMC CmapTools, has information related to: Peterson Nerve Block, Peterson Nerve Block (MO) areas blocked 1. Opthalmic & Maxillary branches of the trigeminal nerve., Peterson Nerve Block (MO) disadvanatges 1. It is known to be a more challenging nerve block, lots of practice! 2. If you're not in the right location, it's not going to be effective. (Block failure) Complications: apnea & death, Peterson Nerve Block (MO) Is used to Desensitizes the eye along with the orbit for eye surgeries (e.g enucleations). It can also be used when dehorning adult bovine animals. Used for cattle & horses., Peterson Nerve Block (MO) advantages 1. It is known to be safer than retrobulbar block since there is less risk of penetration and hemorrhage. 2. More effective 3. Injecting the meninges surrounding the optic nerve is minimized.