Anatomy: Ultrasound guided interscalene block is performed at the root/trunk level of the brachial plexus (approx. C6/7 vertebral level, corresponding to the cricoid cartilage level). At this level, the roots/trunks lie wedged between the scalene muscles (Fig.1).ig. 1. Interscalane nerve block: illustration of the roots/trunks at the C6/7 vertebral level lying in between the anterior and middle scalene muscles. At the immediate supraclavicular level, the trunks/divisions are closely grouped superolateral (and posterolateral) to the subclavian artery.
When a word like and, or, and but (called conjunctions) joins two standalone sentences, you should put a comma before it. (The real name for a standalone sentence within a longer sentence is independent clause .). Words like and, or, and but are known as conjunctions.
Using a Comma before And in a List. Writers frequently wonder whether a comma should go before the conjunction and in a list of three or more items. Despite the fact that not all style books agree on this issue, we recommend using a comma after the next-to-last item in a seriesâthe serial comma, as it is called.