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Musculoskeletal
Anatomy
Hand
Thumb Anatomy
Thumb Anatomy
Julia R. Crim, MD
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TERMINOLOGY
Definitions
Abduction: Movement away from 2nd digit
Adduction: Movement toward 2nd digit
Opposition: Thumb comes in contact with other fingers; combination of flexion and abduction
Reposition: Return from opposition to anatomic position
GROSS ANATOMY
Features Distinguishing Thumb From Other Digits
1st Carpometacarpal Joint
1st Metacarpophalangeal Joint: Hinge Joint
1st Interphalangeal Joint
Intrinsic Thenar Muscles
Other Intrinsic Muscles
Extrinsic Muscles
Flexor Pulleys
Related Anatomy
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Related Differential Diagnoses
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References
Tables
Tables
TERMINOLOGY
Definitions
Abduction: Movement away from 2nd digit
Adduction: Movement toward 2nd digit
Opposition: Thumb comes in contact with other fingers; combination of flexion and abduction
Reposition: Return from opposition to anatomic position
GROSS ANATOMY
Features Distinguishing Thumb From Other Digits
1st Carpometacarpal Joint
1st Metacarpophalangeal Joint: Hinge Joint
1st Interphalangeal Joint
Intrinsic Thenar Muscles
Other Intrinsic Muscles
Extrinsic Muscles
Flexor Pulleys
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