T1 myotome tests which finger movements?

T1 myotome tests which finger movements?

• A. Elbow extension and wrist flexion
• B. Knee extension
• C. Finger abduction and adduction (interossei)
• D. Shoulder abduction and external rotation

Answer: (C)

Testing the T1 myotome focuses on the intrinsic hand muscles that move the fingers. T1 controls the interossei, which handle finger abduction (spreading the fingers apart) and adduction (pulling them together toward the middle finger). So asking someone to spread their fingers and then bring them back together directly assesses T1 function. If these movements are weak or asymmetric, it points to a T1-related issue in the intrinsic hand muscles, often linked to the ulnar-innervated interossei. In contrast, the other movements involve different regions: elbow extension and wrist flexion engage higher cervical roots, knee extension involves lumbar roots, and shoulder abduction with external rotation involves C5–C6.

Testing the T1 myotome focuses on the intrinsic hand muscles that move the fingers. T1 controls the interossei, which handle finger abduction (spreading the fingers apart) and adduction (pulling them together toward the middle finger). So asking someone to spread their fingers and then bring them back together directly assesses T1 function. If these movements are weak or asymmetric, it points to a T1-related issue in the intrinsic hand muscles, often linked to the ulnar-innervated interossei. In contrast, the other movements involve different regions: elbow extension and wrist flexion engage higher cervical roots, knee extension involves lumbar roots, and shoulder abduction with external rotation involves C5–C6.