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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aviation (ËeÉªvÉªËeÉªÊÉn) n 1. (Aeronautics) a. the art or science of flying aircraft b. the design, production, and maintenance of aircraft 2. (Military) US military aircraft collectively [C19: from French, from Latin avis bird]