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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1 Accessory cloud (WMO supplementary feature) â secondary cloud that is associated with but separate from a main cloud. 2  Anvil (WMO supplementary feature incus) â the anvil top of a cumulonimbus cloud.