This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Nerve lying in the spiral groove of humerus is: 
Select and explain. 
A. Musculocutaneous nerve, B. Ulnar nerve, C. Radial nerve, D. Median nerve
C: Radial nerve
Answer: C: Radial nerve 
Explanation: Anatomy of radial nerve Formed by: Axons from Roots: C5 to T1 Brachial plexus Trunks: Superior, Medial and Inferior Cord: Posterior Axons pass through Spiral groove of humerus Fibrous arch attachment of triceps to humerus Lateral intermuscular septum below deltoid inseion Arcade of Frohse: Above supinator and below elbow Branches Above elbow - Above spiral groove (humerus)