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34 terms

Muscles of the Hand

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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
Palmaris Longus Peripheral & Segmental Innervation
Peripheral: Median Nerve
Segmental: C(6), C7, C8, (T1)
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 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
Flexor Digitorum Profundus Peripheral & Segmental Innervation
Peripheral-
Lateral: Median Nerve (ant IO nerve)

Medial: Ulnar nerve

Segmental: (C7), C8, T1
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 Pollicis Longus Peripheral and Segmental Innervation?
Peripheral: Ant. Interosseous (median)

Segmental: (C6), 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
Flexor Polllicis Brevis Peripheral and Segmental Innervation?
Peripheral: Median (superifical head) (C6), (C7), (C8), (T1)
Ulnar (deep head) C8, T1

Segemt
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
Pronator Quadratus Peripheral and Segmental Innervation?
Peripheral: Ant. Interosseous (median)

Segmental: (C7), C8, T1
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
Abductor Pollicis Brevis Peripheral and Segmental Innervation?
Peripheral: Medial Nerve

Segmental: C6-T1
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
Opponens Pollicis Peripheral and Segmental Innervation?
Peripheral: Median Nerve

Segmental: (C6), (C7), (C8), (T1)
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 Carpi Ulnaris Peripheral and Segmental Innervation?
Peripheral: Ulnar Nerve
Segmental: (C7), C8, (T1)
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 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
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
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
Extensor Carpi Radialis Longus Peripheral and Segmental Innervation?
Peripheral: Radial Nerve
Segmental: (C5), C6, C7, (C8)
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
Extensors Carpi Radialis Brevis Peripheral and Segmental Innervation?
Peripheral: Post. Interosseous Nerve (Radial)

Segmental: C6, C7, C8
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 Digit minimi Peripheral and Segmental Innervation?
Peripheral: Post. Interosseous nerve (radial)

Segmental: (C6), C7, C8
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
Extensor carpi Ulnaris Peripheral and Segmental Innervation?
Peripheral: Post. Interosseous Nerve (radial)

Segmental: (C6), C7, C8
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 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
Abductor Pollicis Longus Peripheral and Segmental Innervation?
Peripheral: Post. Interosseous nerve

Segmental: (C6), C7, C8
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
Extensor Pollicis Longus Peripheral and Segmental Innervation?
Peripheral: Post. interosseous nerve

Segmental: (C6), C7, C8