Muscles PKT part II UE fall 2026

PA: Extensor Indicis

Posterior surface of distal third of ulna and interosseous membrane

DA: Extensor Indicis

Extensor expansion of 2nd digit

A: Extensor Indicis

MP, DIP, PIP extension of 2nd digit enabling its independent extension. Wrist extension

N: Extensor Indicis

Radial (posterior interosseous) C7

PA: Opponens Pollicis

Flexor retinaculum and tubercles of scaphoid and trapezium

DA: Opponens Pollicis

Lateral side of 1st metacarpal

A: Opponens Pollicis

Oppositon of 1st digit

N: Opponens Pollicis

Median (recurrent branch) C8

PA: Flexor Pollicis Brevis

Flexor retinaculum and tubercles of scaphoid and trapezium

DA: Flexor Pollicis Brevis

Lateral side of base of proximal phalanx of 1st digit

A: Flexor Pollicis Brevis

MP flexion of 1st digit

N: Flexor Pollicis Brevis

Superficial head: Median (recurrent branch) C8, Deep head: Ulnar (deep branch) T1

PA: Adductor Pollicis

Oblique head: base of 2nd and 3rd metacarpals, capitate, and adjacent carpals, Transverse head: anterior surface of shaft of 3rd metacarpal

DA: Adductor Pollicis

Medial side of base of the proximal phalanx of 1st digit

A: Adductor Pollicis

CMC adduction of 1st digit

N: Adductor Pollicis

Ulnar (deep branch) T1

PA: Abductor Digiti Minimi

Pisiform

DA: Abductor Digiti Minimi

Medial side of base of proximal phalanx of 5th digit

A: Abductor Digiti Minimi

MP abduction and flexion of 5th digit

N: Abductor Digiti Minimi

Ulnar (deep branch) T1

PA: Flexor Digiti Minimi Brevis

Hook of hamate and flexor retinaculum

DA: Flexor Digiti Minimi Brevis

Medial side of base of proximal phalanx of 5th digit

A: Flexor Digiti Minimi Brevis

MP flexion of 5th digit

N: Flexor Digiti Minimi Brevis

Ulnar (deep branch) T1

PA: Opponens Digiti Minimi

Hook of hamate and flexor retinaculum

DA: Opponens Digiti Minimi

Medial border of 5th metacarpal

A: Opponens Digiti Minimi

Opposition of 5th digit

N: Opponens Digiti Minimi

Ulnar (deep branch) T1