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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Synonym(s): accessory organs (1) , adnexa, annexa. /adÂ·nexa/ (ad-nekÂ´sah) [L., pl.] appendages or accessory structures of an organ, as the appendages of the eye (a. oÂ´culi), including the eyelids and lacrimal apparatus, or of the uterus (a. uÂ´teri), including the uterine tubes and ligaments and ovaries.