Median nerve anaesthesia is sometimes indicated in the diagnosis of forelimb lameness in the horse in conjunction with the ulnar nerve block, but the localisation of the nerve to perform a precise deposition of the anaesthetic solution around and close to the nerve is difficult to achieve using the conventional blind technique. The objectives of this paper are to describe the ultrasonographic anatomy of the median nerve and the technique for performing an ultrasound‐guided anaesthetic block of the nerve. The median nerve is imaged using a microconvex (or linear) probe in transverse section performed proximally to the chestnut on the medial aspect of the forearm. Distribution of the anaesthetic solution around the nerve is done by initially inserting the needle caudally and then cranially to the nerve and injecting 4–6 mL at each site. Control of the needle penetration avoids erroneous intravascular or intramuscular injections or sudden horse reaction. Ultrasound‐guided injection has the potential to safely and accurately block the median nerve.

中文翻译：

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超声引导下正中神经阻滞

在诊断前臂la足和尺神经阻滞时，有时会指示中枢神经麻醉，但是使用麻醉药难以实现神经的局部定位，以精确麻醉剂沉积在神经周围和附近。传统的盲法。本文的目的是描述正中神经的超声解剖学以及执行超声引导的神经麻醉阻滞的技术。使用微凸（或线性）探头在前臂内侧向栗子近侧的横截面中对正中神经进行成像。麻醉剂在神经周围的分布是通过先将针头尾部插入，然后向神经缝隙地插入神经，然后在每个部位注射4–6 mL。控制针头穿透可避免错误的血管内或肌肉内注射或突然的马反应。超声引导注射有可能安全，准确地阻断正中神经。