Arm and Forearm Insertions + Origins + Actions

Deltoid Origins:

Anterior Fibers – Clavicle

Middle Fibers – Acromion of Scapula

Posterior Fibers – Spine of Scapula

Deltoid Insertions:

Deltoid Tuberosity of Humerus

Deltoid Action:

Anterior Fibers – Flexion and medial rotation at the shoulder

Middle Fibers – Abduction at the shoulder

Posterior Fibers – Extension and lateral rotation at the shoulder

Triceps Brachii Origin:

Long Head - Glenoid Fossa - Inferior Lip

Lateral Head - Posterior Humerus

Medial Head - Posterior & Medial Humerus

Triceps Brachii Insertion:

Olecranon of Ulna

Triceps Brachii Action:

Extension at the elbow

Biceps Brachii Origin:

Long Head – Glenoid Fossa – superior lip

Short Head – Coracoid Process of Scapula

Biceps Brachii Insertions:

Radial Tuberosity of Radius

Biceps Brachii Action:

Flexion at the elbow

Supination of the forearm

Brachialis Action:

Flexion at the elbow

Coracobrachialis Action:

Flexion at the shoulder

Adduction at the shoulder

Brachioradialis Action:

Flexion at the elbow

Pronator Teres Action:

Pronation of the forearm

Flexor Carpi Radialis Action:

Flexion of the wrist

Palmaris Longus Action:

Flexion of the wrist

Flexor Carpi Ulnaris Action:

Flexion of the wrist

Flexor Digitorum Superficialis Action:

Flexion of the wrist

Flexion of the fingers

Flexor Digitorum Profundus Action:

Flexion of the wrist

Flexion of the fingers

Extensor Carpi Ulnaris Action:

Extension of the wrist

Extensor Carpi Radialis Longus Action:

Extension of the wrist

Extensor Carpi Radialis Brevis Action:

Extension of the wrist

Extensor Digitorum Action:

Extension of the wrist

Extension of the fingers

Extensor Digiti Minimi Action:

Extension of the wrist

Extension of the fingers

Supinator Action:

Supination of the forearm