【評論主題】39.牽張（stretch）肱三頭肌長頭時，適合的姿勢為：①肩關節伸直 ②肩關節屈曲 ③肘關節伸直 ④肘關節屈曲(A)②④(B)①③(C)②③(D)①④

【評論內容】肱三頭肌長頭的起、止點放別為起點：infraglenoid tubercle of the scapula by a broad tendon closely related to the shoulder joint capsule止點：olecranon process of the ulna動作包含GH joint ext和humeroulnar joint ext故要牽張肌肉（肌肉拉長）時，需做出與動作（肌肉縮短）相反的姿勢，即②肩關節屈曲、④肘關節屈曲。