Bassett Collection Large Image - Lane Medical Library, Stanford University Medical Center

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Arm

Relation of left radial nerve to triceps muscle, posterior view

The long and lateral heads of the triceps muscle have been transected (19) and reflected laterally.

1 .	Teres minor muscle
2 .	Circumflex scapular artery
3 .	Teres major muscle
4 .	Muscular branches of radial nerve
5 .	Triceps brachii muscle (long head, reflected laterally)
6 .	Muscular branches brachial artery
7 .	Triceps brachii muscle (lateral head, reflected laterally; pointer on intramuscular aponeurosis which unites long and lateral heads of muscle)
8 .	Teres major muscle (area of origin)
9 .	Radial nerve (retracted medially)
10 .	Coracobrachialis muscle (in background)
11 .	Brachial artery
12 .	Muscular branch of radial nerve (to lateral head of triceps)
13 .	Upper pointer: Deep brachial artery (continues distally as radial collateral artery) Lower pointer: Body of humerus (covered by periosteum pointer on sulcus of radial nerve)
14 .	Dorsal antebrachial cutaneous nerve
15 .	Triceps brachii muscle (medial head)
16 .	Superior ulnar collateral artery
17 .	Muscular branch of radial nerve (to lower part of medial head of triceps and to anconeus muscle)
18 .	Muscular branch of radial nerve (to medial head of triceps)
19 .	Triceps brachii muscle (transected; upper pointer, lateral head; lower pointer, long head)