anatomy forearm/wrist/hand muscles- dpt

supinator

p- lat. epicondyle; radial collateral lig; supinator crest of ulna

d- prox. 1/3 of radius, dorsal/ lateral aspects

n- radial n

s- C5,6

a- forearm supination

extensor indicis

p- distal 1/3 dorsal aspect of ulna and membrane

d- ulnar aspect of ext. dig. communis tendon

n- radial n

s- C7,8

a- ext. MCP of index finger

extensor pollicis longus

p- mid 1/3 dorsal ulna and membrane

d- dorsal aspect base of distal phalanx of thumb

n- radial n

s- C7,8

a- extend thumb IP joint

extensor pollicis brevis

p- mid 1/3 dorsal radius and membrane

d- dorsal aspect of base of prox. phalanx of thumb

n- radial n

s- C7,8

a- extend thumb MCP

abductor pollicis longus

p- mid 1/3 dorsal aspect of radius and ulna and membrane

d- lat. aspect base of 1st MC

n- radial n

s- C7,8

a- extend/abduct thumb at CMC joint

extensor carpi radialis longus

p- distal 1/3 lat. supracondylar ridge; lat. epicondyle

d- dorsal aspect of base of 2nd MC

n- radial n

s- C6,7

a- wrist ext

extensor carpi radialis brevis

p- lat. epicondyle

d- dorsal aspect of base of 3rd MC

n- radial n

s- C7,8

a- wrist ext

extensor digitorum (communis)

p- lat. epicondyle

d- 4 tendons, each to dorsal aspects of bases of middle and distal phalanges of fingers 2-5

n- radial n

s- C7,8

a- ext. MCPs digits 2-5

extensor carpi ulnaris

p- lat. epicondyle

d- ulnar aspect, base of 5th MC

n- radial n

s- C7,8

a- wrist ext.

brachioradialis

p- prox. 2/3 lat. supracondylar ridge

d- radial styloid

n- radial n

s- C5,6,7

a- elbow flexion; accessory pro/sup.

extensor digiti minimi

p- ulnar aspect of EDC tendon and membrane

d- EDC tendon on dorsum of 1st phalanx of 5th finger

n- radial n

s- C7,8

a- ext. of MCP of 5th digit

anconeus

p- dorsal aspect of lat. epicondyle

d- lat. aspect of olecranon; prox ¼ dorsolateral aspect of ulna

n- radial n

s- C7,8 T1

a- ext. elbow; traction of joint capsule

flexor pollicis longus

p- middle ½ ant. aspect of radius and membrane

d- palmar aspect of base of distal phalanx of thumb

n- median n

s- C8, T1

a- flex thumb IP

flexor digitorum profundus

p- prox. ¾ anteromed. aspect of ulna and membrane

d- 4 tendons to fingers 2-5, each to ant. aspect of base of distal phalanx

n- 2 ulnar heads: ulnar n; 2 radial heads: median n

s- C8, T1

a- flex. DIP digits 2-5

pronator quadratus

p- distal ¼ ant. ulna

d- distal ¼ anterolateral radius

n- median n

s- C8, T1

a- forearm pronation

flexor digitorum superficialis (sublimis)

p- med. epicondyle; medial aspect of coronoid process; prox. 1/3 ant. aspect of radius

d- 4 tendons to fingers 2-5: ant. aspects of bases of middle phalanges

n- median n

s- C7,8, T1

a- flex. PIP of digits 2-5

flexor carpi radialis

p- medial epicondyle

d- ant. aspect of base of 2nd MC

n- median n

s- C6,7

a- wrist flexion

flexor carpi ulnaris

p- medial epicondyle; prox. 2/3 posteromed. aspect of ulna

d- pisiform and hamate

n- ulnar n

s- C7, 8

a- wrist flexion

palmaris longus

p- medial epicondyle

d- flexor retinaculum and palmar fascia

n- median n

s- C7,8

a- wrist flexion, draws palmar fascia centrally

pronator teres

p- med. epicondyle; med. aspect of coronoid

d- mid 1/3 lat. aspect of radius

n- median n

s- C6,7

a- forearm pronation, elbow flexion

flexor pollicis brevis

p- lateral head: ridge on trapezium and flexor retinaculum; medial head: trapezoid and capitate bones

d- radial and ulnar sides of palmar surface base of prox. phalanx of thumb with 2 sesamoids

n- lat. head: median n.; med. head: ulnar n.

s- C8, T1

a- flex. MCP of thumb

abductor pollicis brevis

p- ridge of trapezium; tuberosity of scaphoid

d- radial/palmar aspects of base of 1st phalanx of thumb

n- median n

s- C8, T1

a- abduct thumb at CMC

adductor pollicis

p- palmar aspect of capitate; palmar aspect of base of 2nd MC; palmar aspect of distal 2/3 of 3rd MC

d- ulnar/palmar aspect of base of 1st phalanx of thumb

n- ulnar n

s- C8, T1

a- adduct thumb at CMC

opponens pollicis

p- ridge of trapezium; flexor retinaculum

d- palmar/ radial aspect of 1st MC (entire length)

n- median n

s- C8, T1

a- opposition at CMC

abductor digiti minimi

p- pisiform; tendon of FCU

d- palmar/ ulnar aspects of base of prox. phalanx of 5th finger

n- ulnar n

s- C8, T1

a- abduct 5th digit at MCP

flexor digiti minimi

p- hook of hamate

d- palmar/ ulnar aspects of base of 1st phalanx of 5th digit

n- ulnar n

s- C8, T1

a- flex 5th finger at MCP

opponens digiti minimi

p- hook of hamate

d- ulnar/ palmar aspects of 5th MC (entire length)

n- ulnar n

s- C8, T1

a- oppose 5th finger at CMC

lumbricales

p- 1st: radial side 1st FDP; 2nd: radial side 2nd FDP; 3rd: adj. sides FDP tendons 2&3; 4th: adj. sides FDP tendons 3&4

d- extensor hood mech

n-1st &2nd: median n; 3rd&4th: ulnar n

s- C8, T1

a- flex MCP, ext. IP fingers 2-5

palmaris brevis

p- palmar aponeurosis

d- fascia/ skin ulnar side of palm

n- ulnar n

s- C8, T1

a- approximates thenar and hypothenar sides

palmar interossei

p- #1: ulnar/palmar aspects of 2nd MC; #2: radial/palmar aspects of 4th MC; #3: radial/palmar aspects of 5th MC

d- #1: ulnar aspect base of 1st phalanx of 2nd digit; #2: radial aspect base of 1st phalanx of 4th digit; #3: radial aspect base of 1st phalanx of 5th digit

(also attach to extensor hoods of digits 2,4,5)

n- ulnar n

s- C8, T1

a- adduct digits 2,4,5; flex MCP, extend IPs

dorsal interossei

p- adj. sides of metacarpals

d- #1: radial side base of 1st phalanx of 2nd digit; #2: radial side base of 1st phalanx of 3rd digit; #3: ulnar side base of 1st phalanx of 3rd digit; #4: ulnar side base of 1st phalanx of 4th digit

n- ulnar n

s- C8, T1

a- abduct digits 2,3,4; extend IPs of 2,3,4