what are accessory muscles for breathing
Inspiration. Accessory muscles are used in addition to the diaphragm for breathing, but this is not normal. Accessory muscles used for inhalation include the scalene, sternomastoid and trapezium, which are found around the shoulders and neck.
accessory muscles of respiration-in labored breathing, the use of muscles other than the diaphragm and intercostals. the sternocleidomastoid, spinal, neck, and abdominal muscles and even the platysma, may be used. their use is a sign of an abnormal or labored breathing pattern.
The diaphragm is the main muscle of respiration (normal/relaxed breathing), assisted by the intercostals. No accessory muscles should be recruited during normal respiration unless there is a respiratory disorder. During quiet inspiration, the diaphragm and intercostals are activated.