单项选择题
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
A．musculocutanous nerve B．median nerve C．ulnar nerve D．radial nerve E．axillary nerve