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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Define rotary-wing aircraft: rotorcraft; specifically : helicopter âusually used in plural rotorcraft; specifically : helicopter âusually used in pluralâ¦ See the full definition