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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guide, incisal, angle, n See angle, incisal guide. guide plane, n a fixed or removable orthodontic appliance designed to deflect the functional path of the mandible and alter the positions of specific teeth.