Muscles of the Arm

Question 1

Biceps Brachii

Answer 1

Attachments:

Superior/Proximal: Short Head to Tip of Coracoid Process of Scapula & Long Head to Supraglenoid Tubercle of Scapula
Inferior/Distal: Tuberosity of Radius & Fascia of Forearm (via Bicipital Aponeurosis)

Action:

Supinates Forearm & when it is Supine, Flexes Forearm & Short Head Resists Disclocation of Shoulder

Question 2

Coracobrachialis

Answer 2

Attachments:

Superior/Proximal: Tip of Coracoid Process of Scapula
Inferior/Distal: Middle Medial Humerus

Action:

Helps Flex and Adduct Arm & Resists Dislocation of Shoulder

Question 3

Brachialis

Answer 3

Attachments:

Superior/Proximal: Distal Anterior Humerus
Inferior/Distal: Coronoid Process & Tuberosity of Ulna

Action:

Flexes Forearm in all positions

Question 4

Triceps Brachii

Answer 4

Attachments:

Superior/Proximal: Long Head to Infraglenoid Tubercle of Scapula & Lateral Head to Posterior Humerus (Superior to Radial Groove) & Medial Head to Posterior Humerus (Inferior to Radial Groove)
Inferior/Distal: Proximal End of Olecranon of Ulna & Fascia of Forearm

Action:

Chief Extensor of Forearm & Long Head Resists Dislocation (Especially during Adduction)

Question 5

Anconeus

Answer 5

Attachments:

Superior/Proximal: Lateral Epicondyle of Humerus
Inferior/Distal: Lateral Olecranon & Superior Posterior Ulna

Action:

Assists Trices in Extension & Stabilises Elbow & May Abduct Elbow during Pronation