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Which nerve block is commonly used for ocular examinations in horses?
Trigeminal nerve block
Corneal nerve block
Auriculopalpebral nerve block
Oculomotor nerve block
The correct answer is: Auriculopalpebral nerve block
The auriculopalpebral nerve block is indeed the most commonly used nerve block for ocular examinations in horses. This specific nerve block inhibits the function of the auriculopalpebral nerve, which provides motor innervation to the orbicularis oculi muscle. By blocking this nerve, the horse's eyelid is relaxed, allowing for a more comprehensive examination of the ocular structures without causing discomfort or reflexive blinking that might hinder the process. This technique is particularly useful in veterinary practice because it allows the clinician to perform a thorough examination of the eye while minimizing stress and with minimal sedation. The other options mentioned do not primarily facilitate ocular examinations in horses. For instance, the trigeminal nerve block focuses on sensory pathways for facial sensation, while the corneal nerve block is more about desensitizing the cornea itself, which is not typically the aim during routine examinations. The oculomotor nerve block is also less relevant as it primarily affects motor control to the eye muscles rather than facilitating a detailed ocular examination.