Kinesiology Extrinsic Hand Muscles

Extensor indicis PA

Distal ulna

Extensor indicis DA

Distal phalanx 2nd digit

Extensor indicis action

Extends index finger

Extensor indicis innervation

Radial nerve

Extensor digiti minimi PA

Lateral epicondyle

Extensor digiti minimi DA

Distal phalanx 5th digit

Extensor digiti minimi action

Extends all joints on pinky

Extensor digiti minimi innervation

Radial nerve

Flexor digitorum superficialis PA

Common flexor tendon on the medial epicondyle of humerus, coronoid process of ulna & radius​

Flexor digitorum superficialis DA

4 tendons, each to the sides of the middle phalanges of the fingers​

Flexor digitorum superficialis action

Flexion of MCP & PIP joints and wrist flexion​

Flexor digitorum superficialis innervation

Median nerve

Flexor digitorum profundis PA

Anterior Ulna & interosseus membrane

Flexor digitorum profundis DA

By 4 tendons to the distal phalanx of digits 2-5

Flexor digitorum profundis action

Flexion of the MTP, PIP, and DIP joints, and wrist flexion

Flexor digitorum profundis innervation

Medial half-ulnar nerve, Lateral half-median nerve

Flexor pollicis longus PA

Anterior radius & interosseus membrane​

Flexor pollicis longus DA

Distal phalanx of thumb​

Flexor pollicis longus action

Flexion of the CMC, MCP & IP joints of the thumb and wrist flexion​

Flexor pollicis longus innervation

Median nerve

Extensor digitorum PA

Posterior surface of the radius, ulna, & interosseus membrane​

Extensor digitorum DA

By 4 tendons, each to the base of the extensor mechanism and proximal phalanx of digits 2-5​

Extensor digitorum action

Extension of the fingers

Extensor digitorum innervation

Radial nerve

Abductor pollicis longus PA

Posterior surface of the radius, ulna & interosseus membrane

Abductor pollicis longus DA

Metacarpal of the thumb​

Abductor pollicis longus action

Abduction & extension of the CMC joint of the thumb​

Abductor pollicis longus innervation

Radial nerve

Extensor pollicis brevis PA

Posterior aspect of the radius and interosseus membrane​

Extensor pollicis brevis DA

Dorsal, proximal phalanx of the thumb​

Extensor pollicis brevis action

Extension of the MCP and CMC joints of the thumb

Extensor pollicis brevis innervation

Radial nerve

Extensor pollicis longus PA

Posterior surface of ulna & interosseus membrane

Extensor pollicis longus DA

Dorsal distal phalanx of the thumb​

Extensor pollicis longus action

Extension of the IP, MCP & CMC joints of the thumb​

Extensor pollicis longus innervation

Radial nerve