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Brachialis-Action
Flex the elbow (humeroulnar joint)
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Brachialis-Origin
Distal Half of anterior surface of humerus
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Brachialis-Insertion
Tuberosity and coronoid process of ulna
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Brachialis-Innervation
Musculocutaneous, small branch from radial C5, 6
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Brachioradialis-Action
Flex the elbow (humeroulnar joint)
Assist to pronate and supinate the forearm when these movements are resisted
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Brachioradialis-Origin
Proximal two-thirds of the lateral supracondylar ridge of humerus
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Brachioradialis-Insertion
Styloid process of radius
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Brachioradialis-Innervation
Radial C5, 6
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Extensor Carpi Radialis Longus and Brevis-Action
- Extend the wrist (radiocarpal joint)
- Abduct the wrist (r/c joint)
- Assist to flex the elbow (humerulnar joint)
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Extensor Carpi Radialis Longus and Brevis-Origin
- Longus:
- *Distal one-third of the lateral supracondylar ridge of the humerus
- Brevis:
- *Common extensor tendon from the lateral epicondyle of humerus
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Extensor Carpi Radialis Longus and Brevis-Insertion
- Longus:
- *base of 2nd metacarpal
- Brevis:
- *base of 3rd metacarpal
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Extensor Carpi Radialis Longus and Brevis-Innervation
- Longus: Radial C5, 6, 7, 8
- Brevis: Radial C6, 7, 8
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Extensor Carpi Ulnaris-Action
- Extend the wrist (radiocarpal joint)
- Adduct the wrist (r/c joint)
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Extensor Carpi Ulnaris-Origin
Common extensor tendon from the lateral epicondyle of humerus
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Extensor Carpi Ulnaris-Insertion
Base of 5th metacarpal
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Extensor Carpi Ulnaris-Innervation
Radial C6, 7, 8
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Extensor Digitorum-Action
- Extend the 2nd-5th fingers (metacarpophalangeal and interphalangeal joints)
- Assist to extend the wrist (radiocarpal joint)
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Extensor Digitorum-Origin
common extensor tendon from the lateral epicondyle of humerus
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Extensor Digitorum-Insertion
bases of middle and distal phalanges of 2nd-5th fingers
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Extensor Digitorum-Innervation
Radial C6, 7, 8
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Anconeus-Action
Extend the elbow (humeroulnar joint)
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Anconeus-Origin
lateral epicondyle of the humerus
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Anconeus-Insertion
Olecranon process and posterior, proximal surface of ulna
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Anconeus-Innervation
Radial C7, 8
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Extensor Indicis-Action
- Extend the 2nd finger (metacarpophalangeal joint)
- Adduct the 2nd finger
- May assist to extend the wrist (radiocarpal joint)
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Extensor Indicis-Origin
Posterior surface of distal shaft of ulna and interosseous membrane
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Extensor Indicis-Insertion
Tendon of the extensor digitorum at the level of the 2nd metacarpal
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Extensor Indicis-Innervation
Radial C6, 7, 8
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Flexor Carpi Radialis-Action
- Flex the wrist (radiocarpal joint)
- Abduct the wrist (radiocarpal joint)
- May assist to flex the elbow (humeroulnar joint)
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Flexor Carpi Radialis-Origin
Common flexor tendon from medial epicondyle of humerus
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Flexor Carpi Radialis-Insertion
Bases of 2nd and 3rd metacarpals
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Flexor Carpi Radialis-Innervation
Median C6, 7, 8
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Palmaris Longus-Action
- Tense the palmar fascia
- Flex the wrist (radiocarpal joint)
- May assist to flex the elbow (humeroulnar joint)
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Palmaris Longus-Origin
Common flexor tendon from medial epicondyle of humerus
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Palmaris Longus-Insertion
Flexor retinaculum and palmar aponeurosis
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Palmaris Longus-Innervation
Median C6, 7, 8, T1
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Flexor Carpi Ulnaris-Action
- Flex the wrist (radiocarpal joint)
- Adduct the wrist (radiocarpal joint)
- Assist to flex the elbow (humeroulnar joint)
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Flexor Carpi Ulnaris-Origin
- Humeral head:
- *Comon flexor tendon from medial epicondyle of humerus
- Ulnar head:
- *Posterior surface of proximal two0thirds of ulna
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Flexor Carpi Ulnaris-Insertion
Pisiform, hook or the hamate and base of the fifth metacarpal
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Flexor Carpi Ulnaris-Innervation
Ulnar C7, 8, T1
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Flexor Digitorum Superficialis-Action
- Flex the 2nd-5th fingers (mcp and proximal ip joints)
- Flex the wrist (radiocarpal joint)
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Flexor Digitorum Superficialis-Origin
Common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane and proximal shaft of radius
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Flexor Digitorum Superficialis-Insertion
Sides of middle phalanges of 2nd-5th fingers
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Flexor Digitorum Superficialis-Innervation
Median C7, 8, T1
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Flexor Digitorum Profundus-Action
- Flex the 2nd-5th fingers (mcp and distal ip joints)
- Assist to flex the wrist (radiocarpal joint)
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Flexor Digitorum Profundus-Origin
Anterior and Medial surfaces of proximal three-quarters of ulna
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Flexor Digitorum Profundus-Insertion
Bases of distal phalanges, palmar surface of 2nd-5th fingers
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Flexor Digitorum Profundus-Innervation
- First and second: Medial C7, 8, T1
- Third and fourth: Ulnar C7, 8, T1
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Pronator Teres-Action
- Pronate the forearm (radioulnar joints)
- Assist to flex the elbow (humeroulnar joint)
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Pronator Teres-Origin
Common flexor tendon from the medial epicondyle of humerus and coronoid process of the ulna
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Pronator Teres-Insertion
Middle of lateral surface of the radius
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Pronator Teres-Innervation
Median C6, 7
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Pronator Quadratus-Action
Pronate the forearm (radioulnar joints)
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Pronator Quadratus-Origin
Medial, anterior surface of distal ulna
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Pronator Quadratus-Insertion
Lateral, anterior surface of distal radius
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Pronator Quadratus-Innervation
Medial C7, 8, T1
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Supinator-Action
Supinate the forearm (radioulnar joints)
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Supinator-Origin
Lateral epicondyle of humerus, radial collateral ligament, annular ligament and supinator crest of the ulna
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Supinator-Insertion
Anterior, lateral surface of proximal one-third of radial shaft
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Supinator-Innervation
Radial C5, 6, 7
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Abductor Pollicis Longus-Action
- Abduct the thumb (carpometacarpal joint)
- Extend the thumb (cmc joint)
- Abduct the wrist (radiocarpal joint)
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Abductor Pollicis Longus-Origin
Posterior surface of radius and ulna, and interosseous membrane
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Abductor Pollicis Longus-Insertion
Base of 1st metacarpal
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Abductor Pollicis Longus-Innervation
Radial C6, 7, 8
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Extensor Pollicis Longus and Brevis-Action
- Extend the thumb (interphalgeal joint)
- Extend the thumb (mcp joint and carpometacarpal joints)
- Abduct the wrist (radiocarpal joint)
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Extensor Pollicis Longus and Brevis-Origin
- Longus: posterior surface of ulna and interosseous membrane
- Brevis: posterior surface of radius and interosseous membrane
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Extensor Pollicis Longus and Brevis-Insertion
- Longus: Base of distal phalanx of thumb
- Brevis: Base of proximal phalanx of thumb
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Extensor Pollicis Longus and Brevis-Innervation
Radial C6, 7, 8
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Flexor Pollicis Longus-Action
- Flex the thumb (ip joint)
- Flex the thumb (mcp and carpometacarpal joints)
- Assist to flex the wrist (radiocarpal joint)
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Flexor Pollicis Longus-Origin
Anterior surface of radius and interosseous membrane
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Flexor Pollicis Longus-Insertion
Base of distal phalanx of thumb
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Flexor Pollicis Longus-Innervation
Median C6, 7, 8, T1
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Abductor Pollicis Brevis-Action
- Abduct the thumb (carpometacarpal and mcp joints)
- Assist in opposition of the thumb
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Abductor Pollicis Brevis-Origin
Flexor retinaculum, trapezium and scaphoid tubercles
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Abductor Pollicis Brevis-Insertion
Base of proximal phalanx of thumb
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Abductor Pollicis Brevis-Innervation
Median C6, 7, 8, T1
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Flexor Pollicis Brevis-Action
- Flex the thumb (carpometacarpal and mcp joints)
- Assist in opposition of the thumb
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Flexor Pollicis Brevis-Origin
- Superficial head: Flexor retinaculum
- Deep head: trapezium, trapezoid and capitate
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Flexor Pollicis Brevis-Insertion
base of proximal phalax of thumb
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Flexor Pollicis Brevis-Innervation
- Superficial head: Median C6, 7, 8, T1
- Deep head: Ulnar C8, T1
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Opponens Pollicis-Action
Opposition of the thumb at the carpometacarpal joint (bringing the pads of the thumb and 5th finger together)
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Opponens Pollicis-Origin
Flexor retinaculum and tubercle of the trapezium
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Opponens Pollicis-Insertion
Entire length of the 1st metacarpal bone, radial surface
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Opponens Pollicis-Innervation
Median C6, 7, 8, T1
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Adductors Pollicis-Action
- Adduct the thumb (carpometacarpal and mcp joints)
- Assist to flex the thumb (mcp joint)
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Adductors Pollicis-Origin
Capitate, 2nd and 3rd metacarpals
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Adductors Pollicis-Insertion
Base of proximal phalanx of thumb
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Adductors Pollicis-Innervation
Ulnar C8, T1
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Lumbricals of the hand-Action
- Extend the 2nd-5th fingers at the ip joints
- flex the 2nd-5th fingers at the mcp joints
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Lumbricals of the hand-Origin
Surfaces of the flexor digitorum profundus tendons
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Lumbricals of the hand-Insertion
Externsor aponeurosis on dorsal surface of phalanges
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Lumbricals of the hand-Innervation
- 2nd and 3rd fingers: Median C6, 7, 8, T1
- 4th and 5th fingers: Ulnar C7, 8, T1
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Palmar Interossei-Action
- Adduct the thumb, 2nd, 4th, and 5th fingers toward the third finger
- Assist to felx the thumb, 2nd, 4th, and 5th fingers at the mcp joints
- Assist to extend the thumb, 2nd 4th and 5th fingers at the ip joints
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Palmar Interossei-Origin
Bae of the 1st, 2nd 4th, and 5th metacarpals
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Palmar Interossei-Insertion
Base of the proximal phalanx of the related finger and the extensor aponeurosis
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Palmar Interossei-Innervation
Ulnar C8, T1
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Dorsal Interossei-Action
- Abduct the 2nd, 3rd, and 4th fingers at the mcp joints
- Assist to flex the 2nd, 3rd, and 4th fingers at the mcp joints
- Assist to extend the 2nd, 3rd, and 4th fingers at the ip joints
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Dorsal Interossei-Origin
Adjacent sides of all metacarpals
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Dorsal Interossei-Insertion
Base of the proximal phalanx of the 2nd, 3rd, and 4th fingers and the extensor aponeurosis
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Dorsal Interossei-Innervation
Ulnar C8, T1
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Abductor Digiti Minimi-Action
- Abduct the 5th finger (mcp joint)
- Assist in opposition of the fifth finger toward the thumb (mcp joint)
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Abductor Digiti Minimi-Origin
pisiform and tendon of flexor carpi ulnaris
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Abductor Digiti Minimi-Insertion
Base of proximal phalanx of 5th finger, ulnar surface
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Abductor Digiti Minimi-Innervation
Ulnar C7, 8, T1
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Flexor Digiti Minimi Brevis-Action
- Flex the 5th finger (mcp joint)
- Assist in opposition of the 5th finger toward the thumb
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Flexor Digiti Minimi Brevis-Origin
Hook of hamate and flexor retinaculum
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Flexor Digiti Minimi Brevis-Insertion
Base of proximal phalanx of 5th finger, palmar surface
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Flexor Digiti Minimi Brevis-innervation
Ulnar C7, 8, T1
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Opponens Digiti Minimi-Action
Opposition of the 5th finger at the carpometacarpal joint
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Opponens Digiti Minimi-Origin
Hook of hamate and flexor retinaculum
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Opponens Digiti Minimi-Insertion
Shaft of 5th metacarpal, ulnar surface
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Opponens Digiti Minimi-Innervation
Ulnar C7, 8, T1
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