Arm and elbow OIA Flashcards
Coracobrachialis
Origin: Coracoid process
Insertion: Mid-shaft of humerus on antero-medial
surface
Innervation: Musculocutaneous nerve (C5 - C7)
Action: Adduction and flexion of the arm
Brachialis
Origin: Anterior distal half of the humerus
Insertion: Tuberosity of ulna
Innervation: Musculocutaneous nerve (C5 and C6)
Action: Flexion of forearm
Biceps brachii
Origin: Long head – Supraglenoid tubercle of scapula;
short-head – coracoid process
Insertion: Radial tuberosity
Innervation: Musculocutaneous nerve (C5 & C6)
Action: Flexion and supination of forearm
Triceps brachii
Origin: Long head: Infraglenoid tubercle
Lateral head: Posterior surface of humerus
Medial head: Posterior surface of humerus
Insertion: Olecranon
Innervation: Radial nerve (C6 - C8)
Action: Extension of forearm
Long head: can also extend & adduct
the arm
Flexor carpi ulnaris
Origin: Medial epicondyle & olecranon
Insertion: Pisiform, hamate & 5th metacarpal
Innervation: Ulnar nerve (C7, C8)
Action: Flexes & adducts wrist (ulnar deviation)
Palmaris longus
Origin: Medial epicondyle
Insertion: Palmar aponeurosis and flexor retinaculum
Innervation: Median nerve (C7, C8)
Action: Flexes wrist & tenses palmar aponeurosis
Flexor carpi radialis
Origin: Medial epicondyle
Insertion: Base of metacarpals II & III
Innervation: Median nerve (C6, C7)
Action: Flexes and abducts the wrist
Pronator teres
Origin: Medial epicondyle & coronoid process
Insertion: Lateral surface mid-shaft of radius
Innervation: Median nerve (C6, C7)
Action: Pronation
Flexor digitorum superficialis
Origin: Medial epicondyle & margin coronoid process; oblique line of radius
Insertion: 4 tendons – middle phalanges of the index, middle, ring and little fingers
Innervation: Median nerve (C7, T1)
Action: Flexes wrist, flexes middle and proximal phalanges of digits 2-5
Flexor digitorum profundus
Origin: Anterior & medial surface of ulna & interosseous membrane
Insertion: Four tendons – distal phalanges of the index, middle, ring & little fingers
Innervation: Interosseous branch of the medial and ulnar nerves (C8, T1)
Action: Flexes distal interphalangeal joints
Flexor pollicis longus
Origin: Anterior surface of radius & interosseous membrane
Insertion: Base of distal phalanx of thumb
Innervation: Medial nerve (C7, C8)
Action: Flexes distal phalanx of the thumb
Pronator quadratus
Origin: Distal fourth of anterior surface of the ulna
Insertion: Distal fourth of anterior surface of the radius
Innervation: Median nerve (C7, C8)
Action: Pronation
Brachioradialis
Origin: Lateral supra-epicondylar ridge
Insertion: lateral side of the base of the styloid process of the radius
Innervation: Radial nerve (C5, C6)
Action: Flexes the forearm at the elbow
Extensor carpi radialis longus
Origin: Lateral supraepicondylar ridge
Insertion: Base of metacarpaI II
Innervation: Radial nerve (C6, C7)
Action: Extends & abducts the wrist
Extensor carpi radialis brevis
Origin: Lateral epicondyle
Insertion: Base of metacarpal III
Innervation: Deep branch of radial nerve ( C7, C8)
Action: Extends & abducts the wrist
Extensor digitorum
Origin: Lateral epicondyle
Insertion: 4 tendons (extensor hoods) – base of middle & phalanges of index, middle, ring & little fingers
Innervation: Posterior interosseous (C7, C8)
Action: Extends the index, middle, ring & little fingers
Extensor digiti minimi
Origin: Lateral epicondyle
Insertion: Dorsal digital expansion on the 1st phalax of the little finger
Innervation: Posterior interosseous (C7, C8)
Action: Extends the little finger
Extensor carpi ulnaris
Origin: Lateral epicondyle & posterior border of ulna
Insertion: Tubercle on the base of the medial side of metacarpal V
Innervation: Posterior interosseous (C7, C8)
Action: Extends & adducts the wrist
Anconeus
Origin: Lateral epicondyle
Insertion: Olecranon process & proximal posterior surface of ulna
Innervation: Radial nerve (C7, C8)
Action: Abduction of the ulna in pronation - The anconeus abducts the ulna during pronation to maintain the center of the palm over the same point when the hand is flipped. It is also considered to be an accessory
extensor of the elbow joint
Supinator
Origin: Superior – Lateral epicondyle; Deep – Superior crest of ulna
Insertion: Lateral surface of radius superior to the anterior oblique line
Innervation: Posterior interosseous (C6, C7)
Action: Supination
Abductor pollicus longus
Origin: Posterior surface of ulna & radius, and interosseous membrane
Insertion: Lateral side of base of metacarpal I
Innervation: Posterior interosseous (C7, C8)
Action: Abducts carpometacarpal joint of thumb
Extensor pollicis brevis
Origin: Posterior surface of radius & interosseous membrane
Insertion: Dorsal surface of base of proximal phalanx of the thumb
Innervation: Posterior interosseous (C7, C8)
Action: Extension of thumb, adduction of the wrist
Extensor pollicis longus
Origin: Posterior surface of ulna & interosseous membrane
Insertion: Dorsal surface of base of the distal phalanx of thumb
Innervation: Posterior interosseous (C7, C8)
Action: Extension of thumb, abduction of wrist
Extensor indicis
Origin: Posterior surface of ulna & interosseous membrane
Insertion: Extensor hood of index finger
Innervation: Posterior interosseous (C7, C8)
Action: Extension of the wrist and joints of the second digit
