Thenar muscles
- Abductor pollicis brevis: flexor retinaculum, scaphoid, trapezium → base of proximal phalanx of thumb
- Flexor pollicis brevis: flexor retinaculum / trapezium and trapezoid-capitate region → base of proximal phalanx
- Opponens pollicis: flexor retinaculum and trapezium → first metacarpal
Hypothenar muscles
- Abductor digiti minimi: pisiform → base of proximal phalanx of little finger
- Flexor digiti minimi brevis: hook of hamate and flexor retinaculum → base of proximal phalanx
- Opponens digiti minimi: hook of hamate and flexor retinaculum → fifth metacarpal
Interossei
- Dorsal interossei abduct the fingers (DAB)
- Palmar interossei adduct the fingers (PAD)
Lumbricals
Originate from FDP tendons and insert into the extensor expansion.
Diagram
