Muscles Acting on the Elbow and Forearm Flashcards
Aconeus
Act: Elbow extension, stabilization of ulna during pronation and supination
O: Posterior surface of the lateral epicondyle
I: Lateral border of the olecranon process
Innervation: Radial
Biceps Brachii
Act: Elbow flexion, forearm supination, shoulder flexion
O: Long head: supraglenoid tuberosity of scapula
Short head: coracoid process of scapula
I: Radial tuberosity
Innervation: Musculocutaneous
Brachialis
Act: Elbow flexion
O: Distal one-half of anterior humerus
I: Coronoid process of ulna and ulnar tuberosity
Innervation: Musculocutaneous
Brachioradialis
Act: Elbow flexion, forearm pronation, mat assist with forearm supination
O: Lateral supracondylar ridge of humerus
I: Styloid process of radius
Innervation: Radial
Extensor Carpi Radialis Brevis
Act: Wrist extension and radial deviation
O: Lateral epicondyle via the common extensor tendon and radial collateral ligament
I: Base of 3rd metacarpal
Innervation: Radial
Extensor Carpi Radialis Longus
Act: Wrist extension and radial deviation
O: Supracondylar ridge of humerus
I: Radial side of 2nd metacarpal
Innervation: Radial
Extensor Carpi Ulnaris
Act: Wrist extension and ulnar deviation
O: Lateral epicondyle via the common extensor tendon
I: Ulnar side of the base of the 5th metacarpal
Innervation: Deep radial
Extensor Digitorum Communis
Act: Wrist extension, MCP extension, PIP extension
O: Lateral epicondyle via the common extensor tendon
I: Into the dorsal surface of the base of the middle and distal phalanges of each of the 4 fingers
Innervation: Deep Radial
Flexor Carpi Radialis
Act: Forearm pronation, wrist flexion, radial deviation, elbow flexion
O: Medial epicondyle via the common flexor tendon
I: Palmar aspect of the bases of the 2nd and 3rd metacarpal bones
Innervation: Median
Flexor Carpi Ulnaris
Act: Wrist flexion, ulnar deviation, elbow flexion
O: Humeral head: medial epicondyle via the common flexor tendon
Ulnar head: medial border of the olecranon; proximal two-thirds of the posterior ulna
I: Pisiform, hamate, palmar aspect of the base of the 5th metacarpal
Innervation: Ulnar
Flexor Digitorum Profundus
Act: DIP flexion, PIP flexion, and wrist flexion
O: Anteromedial proximal three-fourths of the ulna and associated interosseous membrane
I: Bases of the digital phalanges of the 2nd through 5th digits
Innervation: Lateral: Median nerve
Medial: Ulnar nerve
Flexor Digitorum Superficialis
Act: PIP flexion, MCP flexion, wrist flexion
O: Humeral head: medial epicondyle via the common flexor tendon; UCL
Ulnar head: coronoid process
Radial head: Oblique line of radius
I: Middle phalanges of the 2nd through 5th digits
Innervation: Median
Palmaris Longus
Act: Wrist flexion
O: Medial epicondyle via the common flexor tendon
I: Flexor retinaculum and palmar aponeurosis
Innervation: Median
Pronator Quadratus
Act: Forearm pronation
O: Anterior surface of the distal one-fourth of the ulna
I: Lateral portion of the distal one-fourth of the radius
Innervation: Anterior interosseous nerve
Pronator Teres
Act: Forearm pronation and elbow flexion
O: Humeral head: proximal to the medial epicondyle of the humerus
Ulnar head: coronoid process
I: Middle one-third of the lateral radius
Innervation: Median
Supinator
Act: Forearm supination
O: Lateral epicondyle, radial collateral ligament, annular ligament, supinator crest of the ulna
I: Proximal one-third of the radius
Innervation: Deep radial
Triceps Brachii
Act: Elbow extension and shoulder extension
O: Long head: infraglenoid tuberosity of the scapula
Lateral head: posterolateral surface of the proximal one-half of the humeral shaft
Medial head: posteromedial surface of the humerus
I: Olecranon process of the ulna
Innervation: Radial
