Which muscle is NOT part of the four-muscle protective layer during thoracic limb amputation?

Which muscle is NOT part of the four-muscle protective layer during thoracic limb amputation?

• A. Pectoral
• B. Deltoideus
• C. Omotransversarius
• D. Latissimus dorsi

Answer: (B)

The protective muscular wrap used after thoracic limb amputation is formed by muscles that cover the ventral and lateral aspects of the limb, creating a cushion over the stump. The muscles typically contributing to this four-muscle envelope are the pectoral muscles, latissimus dorsi, and omotransversarius. The deltoideus sits over the shoulder joint itself and does not participate in forming the protective stump cover. Its role is more about shoulder movement, not creating the ventral-lateral muscular layer used to cushion and protect the amputated limb. So, the deltoideus is not part of the protective four-muscle layer.

The protective muscular wrap used after thoracic limb amputation is formed by muscles that cover the ventral and lateral aspects of the limb, creating a cushion over the stump. The muscles typically contributing to this four-muscle envelope are the pectoral muscles, latissimus dorsi, and omotransversarius. The deltoideus sits over the shoulder joint itself and does not participate in forming the protective stump cover. Its role is more about shoulder movement, not creating the ventral-lateral muscular layer used to cushion and protect the amputated limb. So, the deltoideus is not part of the protective four-muscle layer.