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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Note 2.-- An aircraft is considered to be missing when the official search has been terminated and the wreckage has not been located. Incident. An occurrence, other than an accident, associated with the operation of an aircraft which affects or could affect the safety of operation. There are indeed only two 'official' classifications of aviation incidents, which are defined in ICAO Annex 13. Accident.