Identify the following:
1. humerus
8. brachialis
2. anterior compartment
9. lateral head of triceps
3. posterior compartment
10. long head of triceps
4. lateral intermuscular septum
11. medial head of triceps
5. medial intermuscular septum
12. brachial vessels
6. biceps brachii
13. radial nerve
7. coracobrachialis