Origin:

Oblique head: Originated from capitate and base of the 2nd and 3rd metacarpals

Transverse head: Originated from shaft of the 3rd metacarpal

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

Innervation: Innervated by ulnar nerve, deep branch

Action: It adducts the thumb

Origin: Originated from medial side of the third metacarpal bone and the lateral side of the fourth metacarpal bone

Insertion: Inserted into medial base of the proximal phalanx of the third digit and the extensor hood of the third digit

Innervation: Innervated by the deep branch of the ulnar nerve

Action: It abducts the third digit (moves it away from the midline)

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 suplies the posterior elbow, posterior forearm, posterior hand, deep portion of palmar side of the hand, thumb

Source: Originated from brachial artery

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

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

Source: Originated from radial artery, deep branch of ulnar artery

Branches: It branches into palmar metacarpal arteries (2nd-4th), perforating branches

Supply to: It supplies the deep palm, digits including the dorsum of the distal phalangeal segment

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

Branches: It branches into anterior interosseous nerve, palmar branch, recurrent (motor) branch, common palmar digital nerves (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, lateral 2 lumbrical muscles

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 medial cord of the brachial plexus (C8, T1)

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

Motor: It innervtes the flexor carpi ulnaris muscle, flexor digitorum profundus muscle (ulnar half), abductor digiti minimi muscle, flexor digiti minimi brevis muscle, opponens digiti minimi muscle, lumbrical muscles, palmar and dorsal interosseous muscles

Sensory: It provide sensory to the skin of the medial side of the wrist and hand; skin of the medial 1 1/2 digits

Source: Originated from posterior cord of the brachial plexus

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

Motor: It innervates the 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