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Summary Information: Scalene Muscles. Scalene Muscles: The scalene muscles are a group of three paired muscles located in the lateral neck. The scalene muscles include the scalenus anterior, scalenus medius, and scalenus posterior.The scalene muscles originate from the cervical vertebrae and insert on the ribs.calene Muscles: The scalene muscles are a group of three paired muscles located in the lateral neck.
Since the nerves of the brachial plexus pass through the space between the anterior and middle scalene muscles, that area is sometimes targeted with the administration of regional anesthesia by physicians. The nerve block, called an interscalene block, may be performed prior to arm or shoulder surgery.he action of the anterior and middle scalene muscles is to elevate the first rib and laterally flex (bend) the neck to the same side; the action of the posterior scalene is to elevate the second rib and tilt the neck to the same side.