Arm (Brachium) Muscles: Flexor Compartment

Biceps Brachii Purposeful Activity:

Combing your hair, washing your face

Biceps Brachii Action:

• Forearm supination (most powerful supinator of

the forearm) • Elbow flexion (when forearm is supinated)

• Shoulder flexion

Biceps Brachii Origin: Short head

coracoid process of scapula

Biceps Brachii Origin: Long head

supraglenoid tubercle

Biceps Brachii Insertion:

Radial tuberosity and bicipital aponeurosis

Biceps Brachii Innervation:

Musculocutaneous nerve (C5, C6)

Brachialis Purposeful Activity:

Eating soup, brushing your teeth

Brachialis Action:

Elbow flexion (regardless of forearm position,

always “on” when elbow flexion is needed)

Brachialis Origin:

Distal half of anterior surface of humerus

Brachialis Insertion:

Coronoid process and tuberosity of ulna

Brachialis Innervation:

Musculocutaneous nerve (C5, C6)