单项选择题
A．musculocutaneous nerve B．median nerve C．ulnar nerve D．axillary nerve E．radial nerve
A．lateral 1/3 of clavicle B．medial border of scapula C．lateral border of first rib D．head of humerus E． pectoralis major
A．it arises from medial cord of brachial plexus B．it innervates triceps brachii C．it supplies posterior group of muscles of arm D．it innervates the coracobrachialis E．it acompanies with deep brachial vessels