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.
Knowing where to use a comma before the word âsoâ is often challenging. Sometimes you need it; other times you should omit it because the context is different. The comma is the most common punctuation mark and the one people wrestle with the most, particularly when it involves words such as so, when, where, which, and however. Letâs look at so. The word so serves as different parts of speech, most commonly as a conjunction, which joins two clauses in a sentence.