Origin: Originated from lateral epicondyle of the humerus, supinator crest & fossa of the ulna, radial collateral ligament, annular ligament

Insertion: Inserted into lateral side of proximal one-third of the radius

Innervation: Innervated by deep radial nerve

Action: It supinates the forearm

Origin: Originated from middle one-third of the posterior surface of the radius, interosseous membrane, mid-portion of posterolateral ulna

Insertion: Inserted into radial side of the base of the first metacarpal

Innervation: Innervated by deep branch of radial nerve

Action: It abducts the thumb at carpometacarpal joint

Origin: Originated from interosseous membrane and the posterior surface of the distal radius

Insertion: Inserted into base of the proximal phalanx of the thumb

Innervation: Innervated by deep radial nerve

Action: It extends the thumb at the metacarpophalangeal joint

Origin: Originated from common extensor tendon (lateral epicondyle of the humerus)

Insertion: Inserted into extensor expansion of digits 2-5

Innervation: Innervated by deep radial nerve

Action: It extends the metacarpophalangeal, proximal interphalangeal and distal interphalangeal joints of the 2nd-5th digits; extends wrist

Origin: Originated from common extensor tendon (lateral epicondyle of the humerus)

Insertion: It joins the extensor digitorum tendon to the 5th digit and inserts into the extensor expansion

Innervation: Innervated by deep radial nerve

Action: It extends the metacarpophalangeal, proximal interphalangeal and distal interphalangeal joints of the 5th digit

Origin: Originated from common extensor tendon & the middle one-half of the posterior border of the ulna

Insertion: Inserted into medial side of the base of the 5th metacarpal

Innervation: Innervated by deep radial nerve

Action: It extends the wrist and adducts the hand

Origin: Originated from common flexor tendon & (ulnar head) from medial border of olecranon & upper 2/3 of the posterior border of the ulna

Insertion: Inserted into pisiform, hook of hamate, and base of 5th metacarpal

Innervation: Innervated by ulnar nerve

Action: It flexes wrist, adducts hand

Origin: Originated from anterior surface of radius and interosseous membrane

Insertion: Inserted into base of the distal phalanx of the thumb

Innervation: Innervated by median nerve

Action: It flexes the metacarpophalangeal and interphalangeal joints of the thumb

Origin: Originated from posterior border of the ulna, proximal two-thirds of medial border of ulna, interosseous membrane

Insertion: Inserted into base of the distal phalanx of digits 2-5

Innervation: Innervated by median nerve (radial one-half); ulnar nerve (ulnar one-half)

Action: Flexes the metacarpophalangeal, proximal interphalangeal and distal interphalangeal joints

Origin: Originated from

Humeroulnar head: common flexor tendon

Radial head: middle 1/3 of radius

Insertion: Inserted into shafts of the middle phalanges of digits 2-5

Innervation: Innervated by median nerve

Action: It flexes the metacarpophalangeal and proximal interphalangeal joints

Origin: Originated from lateral epicondyle of the humerus

Insertion: Inserted from lateral side of the olecranon and the upper one-fourth of the ulna

Innervation: Innervated by nerve to anconeus, from the radial nerve

Action: It extends the forearm

Description: Thick, fibrous band of tissue located on the back (dorsal) side of the wrist

Function: keep the extensor tendons aligned and prevent them from shifting during movement. This is crucial for the proper functioning of the wrist and hand

Source: Originated from brachial artery

Branches: It branches into anterior ulnar recurrent artery, osterior ulnar recurrent artery, common interosseous artery, palmar carpal branch, dorsal carpal branch, deep palmar branch, superficial palmar arterial arch

Supply to: It supplies to the medial side of the anterior forearm, posterior forearm, superficial palm, fingers

Source: Originated from brachial artery

Branches: It branches into radial recurrent artery, palmar carpal branch, superficial palmar branch, dorsal carpal branch, 1st dorsal metacarpal artery, princeps pollicis artery, radialis indicis artery, deep palmar arterial arch

Supply to: It supplies to the posterior elbow, posterior forearm, posterior hand, deep portion of palmar side of the hand, thumb

Source: Originated from axillary artery (brachial artery is the continuation of the axillary artery distal to the teres major muscle)

Branches: It branches into deep brachial artery, superior ulnar collateral artery, nutrient artery, inferior ulnar collateral artery; terminal branches are the radial artery and the ulnar artery

Supply to: It supplies to the arm, forearm and hand

Source: Originated from brachial artery

Branches: It branches into anterior ulnar recurrent artery, osterior ulnar recurrent artery, common interosseous artery, palmar carpal branch, dorsal carpal branch, deep palmar branch, superficial palmar arterial arch

Supply to: It supplies to the medial side of the anterior forearm, posterior forearm, superficial palm, fingers

Source: Originated from brachial artery

Branches: It branches into radial recurrent artery, palmar carpal branch, superficial palmar branch, dorsal carpal branch, 1st dorsal metacarpal artery, princeps pollicis artery, radialis indicis artery, deep palmar arterial arch

Supply to: It supplies to the posterior elbow, posterior forearm, posterior hand, deep portion of palmar side of the hand, thumb

Source: Originated from medial cord of the brachial plexus (C8, T1)

Branches: It branches into palmar cutaneous branch, dorsal branch, superficial and deep branches

Motor: It innervate the flexor carpi ulnaris muscle in the forearm and most of the intrinsic hand muscles

Sensory: It provide sensory to the medial forearm, medial wrist, and the ulnar half of the ring finger and the entire little finger

Source: Originated from lateral and medial cords of the brachial plexus

Branches: It braches into anterior interosseous nerve, palmar branch, recurrent (motor) branch, common palmar digital nerve(for digits 1-3)

Motor: It innervates the pronator teres muscle, flexor carpi radialis muscle, palmaris longus muscle, flexor digitorum superficialis muscle, flexor digitorum profundus muscle (radial half), flexor pollicis longus muscle, pronator quadratus muscle, abductor pollicis brevis muscle, flexor pollicis brevis muscle, opponens pollicis muscle

Sensory: It provide sensory to the skin of the radial half of the palm and palmar side of the lateral 3 1/2 digits (and nail bed for these digits)

Source: Originated from radial nerve

Branches: It branches into the dorsal digital branches

Motor: It innervates the sympathetic motor for the skin

Sensory: It provide sensory to the skin of the posterolateral wrist and hand; dorsum of the lateral 3 1/2 digits (excluding the skin over the distal phalanx/nail bed)

Source: Originated from posterior cord of the brachial plexus

Branches: It branches into the posterior brachial cutaneous nerve, inferior lateral brachial cutaneous nerve, posterior antebrachial cutaneous nerve, superficial and deep branches

Motor:

It innervates muscles of the posterior arm: triceps brachii muscle, anconeus muscle

Muscles of the posterior forearm: brachioradialis, extensor carpi ulnaris muscle, extensor carpi radialis longus muscle, extensor carpi radialis brevis muscle, extensor digitorum muscle, extensor digiti minimi muscle, supinator muscle, abductor pollicis longus muscle, extensor pollicis longus muscle, extensor pollicis brevis muscle, extensor indicis muscle

Sensory: It provide sensory to the skin of the posterior arm, forearm and hand