Arm

Question 1

Biceps brachii

Answer 1

Attachments:
- short head (medial): coracoid process
- long head (lateral): supraglenoid tubercle
- radial tuberosity, deep fascia of arm via bicipital aponeurosis
Actions:
- flexion and supination of the forearm
- short head: resists shoulder dislocation
Innervation:
- musculocutaneous nerve C5, C6 & C7

Question 2

Brachialis

Answer 2

Attachments:
- distal half of anterior surface of humerus
- coronoid process and ulnar tuberosity
Actions:
- flexion of the forearm in all positions
Innervation:
- musculocutaneous nerve C5 & C6

Question 3

Coracobrachialis

Answer 3

Attachments:
- coracoid process 
- middle 1/3 of medial humerus
Actions:
- adduction of the humerus
- flexion of the humerus 
- resists dislocation of shoulder
Innervation: 
- musculocutaneous nerve C5, C6 & C7

Question 4

Triceps brachii

Answer 4

Attachments:
- long head: infraglenoid tubercle
- medial head: posterior surface of humerus inferior to radial groove
- lateral head: posterior surface of humerus superior to radial groove
- proximal surface of olecranon and fascia of forearm
Actions:
- extension of the forearm
- long head may also extend and adduct the humerus
- resists dislocation of the humerus
Innervation:
- radial nerve C6, C7 & C8