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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Takeoff and landing gear. Another means of categorizing aircraft is by the type of gear used for takeoff and landing. In a conventional aircraft the gear consists of two primary wheels under the forward part of the fuselage and a tailwheel.