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The Thenar Eminence Group of intrinsic muscles of the hand is composed of the:
- The muscles of the thenar eminence group attach from the transverse carpal ligament and the scaphoid and trapezium to the thumb.
- The abductor pollicis brevis and flexor pollicis brevis attach distally onto the proximal phalanx of the thumb.
- The opponens pollicis attaches distally onto the metacarpal of the thumb.
- The transverse carpal ligament is also known as the flexor retinaculum.
- Abducts the thumb at the carpometacarpal joint.
- Flexes the thumb at the carpometacarpal joint.
- Medially rotates the thumb at the carpometacarpal joint.
- Opposes the thumb at the carpometacarpal joint.
- Flexes the thumb at the metacarpophalangeal joint.
- All three muscles of the thenar eminence group attach onto the thumb.
- There are three analogous muscles of the hypothenar eminence group that attach onto the little finger: abductor digiti minimi manus, flexor digiti minimi manus, and opponens digiti minimi.