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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Definition of accessory. plural. accessories. 1a : an object or device that is not essential in itself but adds to the beauty, convenience, or effectiveness of something else auto accessories clothing accessoriesb : a thing of secondary or lesser importance : adjunct.