Muscles which produce MCP joint adduction
(Note: by convention, digital adduction is defined as movement toward the
middle finger ray, not medially toward the trunk)
Thumb:
Adductor Pollicis
and
Extensor Pollicis Longus
Index:
First Palmar Interosseous
Ring:
Second Palmar Interosseous
Small:
Third Palmar Interosseous
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