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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An accessory to the tracheostomy tubes is the obturator (pilot), which is an olive-tipped curved rod that is used to guide the outer cannula and prevent scraping of the tracheal walls while the tube is being inserted.