Arm Muscles

Fig.1 Biceps.

Biceps

Origin: Humerus
Insertion: Radius and ulna
Action: Flex elbow

Fig.2 Triceps.

Triceps

Origin: Scapula and humerus
Insertion: Ulna
Action: Extend the elbow

Fig.3 Brachialis and Coraco brachialis.

Brachialis

Origin: Humerus
Insertion: Ulna
Action: Flex elbow

Coraco brachialis

Origin: Scapula
Insertion: Humerus
Action: Adduction

Fig.4 Brachiordialis and Extensor carpi.

Brachiordialis

Origin: Humerus
Insertion: Radius
Action: Flex and laterally rotate the elbow

Extensor carpi radialis

Origin: Humerus
Insertion: Carpals
Action: Extends and abducts the hand

Extensor carpi ulnaris

Origin: Humerus
Insertion: Carpals
Action: Extends and adducts the hand

Extensor carpi digitorum

Origin: Humerus
Insertion: Phalanges
Action: Extends the hands and fingers

Fig.5 Flexor carpi radialis and Flexor carpi ulnaris.

Flexor carpi radialis

Origin: Humerus
Insertion: Carpals
Action: Flexes the wrist joint

Flexor carpi ulnaris

Origin: Humerus
Insertion: Carpals
Action: Flexes the wrist joint

Fig.6 Supinator radii brevis.

Supinator radii brevis

Origin: Humerus
Insertion: Radius
Action: Pronation and small flexion

Fig.7 Flexor carpi digitorum.

Flexor carpi digitorum

Origin: Humerus and radius
Insertion: Carpals
Action: Flexes hand and fingers

Fig.8 Pronator teres.

Pronator teres

Origin: Humerus
Insertion: Radius and Ulna
Action: Supination