In brachial plexus nerve arising from root is: (A) Nerve to serratus anterior, (B) Axillary nerve, (C) Ulnar nerve, (D) Suprascapular nerve
Answer is A. Nerve to serratus anterior or long thoracic nerve arises from the nerve root of C5-C7. Injury to this nerve causes the condition called winging of scapula due to paralysis of serratus anterior muscle. B D Chaurasia 7th edition Page no: 45