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The Senn retractor is a surgical instrument commonly used in various procedures to hold back tissues and provide better visibility for the surgeon. It features a double-ended design, with one end typically having a sharp, curved blade and the other end flat or forked to help manipulate tissues. Its primary purpose is to retract skin, muscle, and other tissues during surgery, making it invaluable for creating and maintaining a clear surgical field.

In contrast, Allis tissue forceps are designed for grasping and holding tissue during surgeries, while Mayo scissors are primarily used for cutting tissue and not for retraction. The spay hook, on the other hand, is specifically intended for assisting in spaying procedures by facilitating entry into the abdominal cavity. Each of these instruments serves distinct roles in surgical settings, reinforcing the importance of correct instrument identification in veterinary practice.