Brachialis

O: Distal 1/2 anterior surface humerus

I:  Tuberosity and coronoid process ulna

ACTIONS

Brachioradialis

O - Lateral supracondylar ridge of humerus

I - Styloid process radius

ACTIONS

*Flex elbow

*Assist in pronation/supination (when resisted)

Flexor Group of Forearm

O - Medial epicondyle of humerus

I - Metacarpals or phalanges

ACTIONS

*Flexion of wrist or fingers

*Adduct wrist

*Assist in elbow flexion

Extensor Group of Forearm

O - Lateral epicondyle of humerus

I - Metacarpals or phalanges

Actions

*Extension of wrist and fingers

*Abduct wrist

*Assist elbow flexion

Thenar Eminence

Four short muscles at base of thumb

ACTIONS

* Opposition of thumb

*Adduction of thumb

*Assist in flexion of thumb

*Abduct thumb

*Flex thumb

Hypothenar Eminence

Three short muscles at ulnar side of palm

ACTIONS

*Abduct 5th finger

*Assist in opposition of 5th finger

*Flex 5th finger