forearm muscles anatomy

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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)


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