The first part of the subclavian artery begins from the origin of subclavian artery and extends to the medial border of the scalenus anterior muscle. It gives off following important branches: 1. Vertebral artery. 2. Thyrocervical trunk.
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at first not generally grasped except by the helicopter's inventor. As with Dr. Focke's airplane, many looked upon it as a curio from the world of aviation, merely a a happy personal triumph of a famous aeronautical engineer.