Muscles of the Hand

Flexor Digitorum Superficialis Origin/Insertion/Action

Origin: Humeral Head- common flexor tendon from medial epicondyle of humerus, ulnar collatearl ligament of elbow joint, and deep antebrachial fascia Ulnar head- medial side of cornoid process Radial Head- oblique line of radius insertion: 4 tendosn into sides of middle phalanges 2-5th digits action: flexion of PIP of 2-5th digits assists in MCP joint flex and wrist flex

Flexor Carpi Ulnaris Origin/Insertion/Action

Origin: Humeral head- Common flexor tendon from medial epicondyle of humerus Ulnar head- by aponeurosis from the medial margin of olecranon, proximal 2/3 of posterior border of ulna Insertion: Pisiform bone and by ligaments to hamate and 5th metacarpal bones Action: Flex, ulnarly deviate wrist, assist in elbow flexion

Flexor Digitorum Profundus Origin/Insertion/Action

Origin: Anterior and medial surface of proximal 3/4 of ulna, interosseus membrane, and deep antebrachial fascia Insertion: by 4 tendons into bases of distal phalanges, anterior surface Action: Flexes DIP of index finger, ring, and little fingers. Assists in PIP, MCP and wrist flexion

Extensors Digitorum Origin, Insertion, Action

Origin: Common extensor tendon from latearl epicondyle of humerus and deep antebrachial fascia Insertion: Medial bands- insert into base of middle phalanx Lateral Bands- reunite over middle phalanx and insert into base of distal phalanx Action: Extend/radially deviate wrist, MCP joint, IP joints, and assists in abduction index, ring, and little finger.

Extensor Digit minmi Origin, Insertion, Action

Origin: Common extensor tendon from latearl epicondyle of humerus and deep antebrachial fascia Insertion: into expansion of little finger with extensor digitorum tendon Action: Extend MCP joints and IP joints

Extensor Carpi radialis Brevis Origin, Insertion, Action?

Origin: Common extensor tendon from lateral epicondyle of humerus Insertion: Dorsal Surface of base of third metacarpal bone Action: Extend wrist, assists in wrist radial deviation

Extensor Carpi Ulnaris Origin/Insertion/Action

Origin: Common extensor tendon of latearl epicondyle Insertion: base of 5th metacarpal bone Action Extend and ulnarly deviate wrist

Palmaris Longus Origin/insertion/action

Origin: Common flexor tendon from medial epicondyle ofhumerous, deep to antebrachial fascia insertion: flexor retinaculum and palmar aponeurosis action: Tenses palmar fascia, flex wrist assists in elbow flexion

Extensor Carpi Radialis Longus Origin/Insertion/Action

Origin: Distal 1/3 of lateral supracondylar ridge of humerus and lateral intermuscular septum Insertion: Dorsal surface of base of 2nd metacarpal bone, radial side Action: Extend , radially deviates wrist and assists in elbow flexion

Opponens Pollicis Origin/Insertion/Action

Origin: Flexor retinaculum and tubercle of trapezium bone Insertion: Entire length of first metacarpal bone, radial side Action: Opposes thumb CMC

Abductor Pollicis brevis Origin/Insertion/Action

Origin: Flexor retinaculum, tubercle of Trapezium, and tubercle of Scaphoid Insertion: Base of proximal phalanx of thumb Action: palmar abduction of CMC and MCP joint; Extend thumb IP joint and flexion MR of CMC joint

Opponens digit minimi Origin/Insertion/Action

Origin: Hook of hamate and flexor retinaculum Insertion: Entire length of 5th metacarpal, ulnar side Action: Opposes 5th CMC joint

Flexor digit minmi Origin/Insertion/Action

Origin: Hook of hamate, and flexor retinaculum Insertion: base of proximal phalanx of 5th digit Action: Flex MCP joint of little finger assists in opposition Ulnar Nerve

Pronator Quadratus Origin/Insertion/Action

Origin: Medial side, anterior surface of distal 1/4 of ulna Insertion: Latearl side of anterior surface of distal 1/4 of radius Action: Pronate forearm

Extensor Pollicis Longus Origin/Insertion,Action

Origin: Middle 1/3 of posterior surface of ulna, distal to origin of APL & IO Insertion: base of distal phalanx of thumb, dorsal surface Action: Extend IP joint, assits thumb MCP & CMC extension, assits wrist radia deviation and extension

Abductor Pollicis Longus origin/insertion/action

Origin: Post. Surface of body fo ulna distal to orign of supinator , IO, and post. surface of middle 1/3 of radius Insertion: Base of 1st metacarpal bone (radial side) Action: extend CMC joint of thumb and wrist radial deviation, assists wrist flexion

Extensor Indicis Origin, Insertion, Action

Origin: Posterior surface of body of ulna, distal to orign of EPL Insertion:Extensor expansion of index finger w/ extensor digitorum longus tendon Actin: Extend MCP joints & extend IP joint of index finger

Abductor Digiti Minmi Origin, Insertion, Action

Origin: Tendon of flexor carpi ulnaris and PISIFORM bone Insertion: by 2 slips into base of proximal phalanx & the other into ulnar border of extensor expansion

Flexor Pollicis Longus Origin/Insertion/Action??

Origin: anterior and medial surface of roximal 3/4 of ulna, IO membrane and deep anterbrachial fascia Insertion: By 4 tendons into bases of distal phalanges, anterior surface Action: Flexes DIP of index, middle ring and little fingers Assists in PIP, MCP, and wrist flexion

Flexor Digitorum Profundus Peripheral & Segmental Innervation

Peripheral- Lateral: Median Nerve (ant IO nerve) Medial: Ulnar nerve Segmental: (C7), C8, T1

Flexor Pollicis Longus Peripheral and Segmental Innervation?

Peripheral: Ant. Interosseous (median) Segmental: (C6), C7, C8, T1

Pronator Quadratus Peripheral and Segmental Innervation?

Peripheral: Ant. Interosseous (median) Segmental: (C7), C8, T1

Abductor Pollicis Brevis Peripheral and Segmental Innervation?

Peripheral: Medial Nerve Segmental: C6-T1

Flexor Polllicis Brevis Peripheral and Segmental Innervation?

Peripheral: Median (superifical head) (C6), (C7), (C8), (T1) Ulnar (deep head) C8, T1 Segemt

Opponens Pollicis Peripheral and Segmental Innervation?

Peripheral: Median Nerve Segmental: (C6), (C7), (C8), (T1)

Palmaris Longus Peripheral & Segmental Innervation

Peripheral: Median Nerve Segmental: C(6), C7, C8, (T1)

Extensors Carpi Radialis Brevis Peripheral and Segmental Innervation?

Peripheral: Post. Interosseous Nerve (Radial) Segmental: C6, C7, C8

Extensor carpi Ulnaris Peripheral and Segmental Innervation?

Peripheral: Post. Interosseous Nerve (radial) Segmental: (C6), C7, C8

Abductor Pollicis Longus Peripheral and Segmental Innervation?

Peripheral: Post. Interosseous nerve Segmental: (C6), C7, C8

Extensor Digit minimi Peripheral and Segmental Innervation?

Peripheral: Post. Interosseous nerve (radial) Segmental: (C6), C7, C8

Extensor Pollicis Longus Peripheral and Segmental Innervation?

Peripheral: Post. interosseous nerve Segmental: (C6), C7, C8

Extensor Carpi Radialis Longus Peripheral and Segmental Innervation?

Peripheral: Radial Nerve Segmental: (C5), C6, C7, (C8)

Flexor Carpi Ulnaris Peripheral and Segmental Innervation?

Peripheral: Ulnar Nerve Segmental: (C7), C8, (T1)

Flexor Pollicis Brevis Origin/Insertion/Action

origin: Superficial head: flexor retinaculum and trapezium bone Deep head: trapezoid and capitate bones Insertion: base of proximal phalanx of thumb, radial side, and extensor expansion Action: Flex MCP, CMC of thumb Assists in opposition, may extend IP joint