forearm muscles anatomy
Posterior Forearm Muscles
(12) Superficial (7): Brachioradialis, Extensor carpi radialis longus, Extensor carpi radialis brevis, Extensor digitorum, Extensor digiti minimi, Extensor carpi ulnaris, Anconeus Deep (5): Supinator, Abductor pollicis longus, Extensor pollicis longus, Extensor pollicis brevis, Extensor indicis
Anterior Forearm Muscles
(8) Superficial: Pronator teres, Flexor carpi radialis, Palmaris longus, Flexor carpi ulnaris Intermediate: Flexor digitorum superficialis Deep: Pronator quadratus, Flexor pollicis longus, Flexor digitorum profundus
Abductor pollicis longus action
Abducts thumb and extends it at CMC joint
Flexor pollicis longus origin
Anterior surface of radius and adjacent interosseous membrane
Abductor pollicis longus insertion
Base of 1st metacarpal bone
Extensor carpi radialis longus insertion
Base of 2nd metacarpal bone
Extensor carpi radialis brevis insertion
Base of 3rd metacarpal bone
Extensor carpi ulnaris insertion
Base of 5th metacarpal bone
Extensor pollicis longus insertion
Base of distal phalanx of thumb
Flexor pollicis longus insertion
Base of distal phalanx of thumb
Extensor pollicis brevis insertion
Base of proximal phalanx of thumb
Flexor digitorum superficialis insertion
Bodies of middle phalanges of medial four digits
Extensor Hood (Expansion)
Common attachment site for all of the tendon pf extensors acting on the digits
Pronator quadratus insertion
Distal half of anterior surface of radius
Pronator quadratus origin
Distal half of anterior surface of ulna
Palmaris longus insertion
Distal half of flexor retinaculum and palmar aponeurosis
Extensor carpi radialis brevis action
Extends and abducts hand at wrist
Extensor carpi radialis longus action
Extends and abducts hand at wrist
Extensor carpi ulnaris action
Extends and adducts hand at wrist
Extensor pollicis longus action
Extends distal phalanx of thumb at MCP and IP joints
Extensor digitorum action
Extends medial four digits at MCP joints; extends hand at wrist joint
Extensor pollicis brevis action
Extends proximal phalanx of thumb at CMC joint
Extensor indicis action
Extension of digit 2 at MCP joint Extension of wrist
Extensor digiti minimi action
Extension of digit 5 at MCP joint Extension of wrist
extensor indicis insertion
Extensor expansion of 2nd digit
Extensor digitorum insertion
Extensor expansions of medial four digits
Extensor digiti minimi insertion
Extensor hood of 5th digit
Flexor digitorum profundus action
Flexes distal phalanges of medial four digits; assists with flexion of wrist
Flexor carpi radialis action
Flexes hand at wrist and abducts it
Flexor carpi ulnaris action
Flexes hand at wrist and adducts it
Palmaris longus action
Flexes hand at wrist and tightens palmar aponeurosis
Brachioradialis action
Flexes mid-pronated forearm at elbow
Flexor digitorum superficialis action
Flexes middle phalanges of medial four digits; also weakly flexes proximal phalanges, forearm, and wrist
Flexor pollicis longus action
Flexes phalanges of 1st digit (thumb)
Flexor carpi unlaris origin
Humeral head: medial epicondyle of humerus Ulnar head: olecranon and posterior border of ulna
Flexor digitorum superficialis origin
Humero-ulnar head: medial epicondyle of humerus, ulnar collateral ligament, and coronoid process of ulna Radial head: superior half of anterior radius
Extensor carpi radialis brevis origin
Lateral epicondyle of humerus
Extensor digitorum origin
Lateral epicondyle of humerus
Extensor digiti minimi origin
Lateral epicondyle of humerus (common extensor tendon)
Extensor carpi ulnaris origin
Lateral epicondyle of humerus and posterior border of ulna
Extensor carpi radialis longus origin
Lateral supracondylar ridge of humerus
Brachioradialis insertion
Lateral surface of distal end of radius
Anatomical Snuffbox Borders
Lateral: Tendons of Extensor pollicis Brevis, Abductor pollicis longus Medial: Extensor pollicis longus Tendon Proximal Border: Styloid Process of the Radius Contents: Radial Artery
Flexor carpi radialis origin
Medial epicondyle of humerus
Palmaris longus origin
Medial epicondyle of humerus
Pronator teres origin
Medial epicondyle of humerus and coronoid process of ulna
Flexor digitorum profundus innervation
Medial part:ulnar nerve Lateral part:median nerve
Flexor carpi radialis innervation
Median nerve (C6-C7)
Pronator teres innervation
Median nerve (C6-C7)
Palmaris longus innervation
Median nerve (C7-C8)
Flexor digitorum superficialis innervation
Median nerve (C8-T1)
Flexor pollicis longus innervation
Median nerve (anterior interosseous)
Pronator quadratus innervation
Median nerve (anterior interosseous) (C7-C8)
Pronator teres insertion
Middle of lateral surface of radius
Flexor digitorum profundus insertion
Palmar bones of distal phalanges of medial four digits
Flexor carpi ulnaris insertion
Pisiform bone, hook of hamate bone, and 5th metacarpal bone
Extensor indicis origin
Posterior surface of ulna and interosseous membrane
Extensor pollicis longus origin
Posterior surfaces of middle third of ulna and interosseous membrane
Extensor pollicis brevis origin
Posterior surfaces of radius and interosseous membrane
Abductor pollicis longus origin
Posterior surfaces of ulna, radius, and interosseous membrane
Pronator teres action
Pronates forearm and flexes elbow
Pronator quadratus action
Pronates forearm and hand
Brachioradialis origin
Proximal part of lateral supracondylar ridge of humerus
Flexor digitorum profundus origin
Proximal part of medial and anterior surfaces of ulna and interosseous membrane
Brachioradialis innervation
Radial nerve (C5-C6)
Extensor carpi radialis longus innervation
Radial nerve (C6-C7)
Extensor carpi radialis brevis innervation
Radial nerve (deep branch) (C7)
Extensor carpi ulnaris innervation
Radial nerve (posterior interosseous)
Extensor pollicis brevis innervation
Radial nerve (posterior interosseous)
Extensor digitorum innervation
Radial nerve (posterior interosseous) (C7-C8)
Extensor pollicis longus innervation
Radial nerve (posterior interosseous) (C7-C8)
Flexor carpi ulnaris innervation
Ulnar nerve (C7-T1)
extensor indicis innervation
posterior interosseous nerve
Extensor digiti minimi innervation
radial nerve
Abductor pollicis longus innervation
radial nerve (posterior interosseous nerve)