During a period of relaxed and average respiration, the muscles associated with inspiration, or the process of inhaling, include the muscles of the diaphragm, the external intercostal muscles, and the interchondral region of the internal intercostal muscles.
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The diaphragm, external intercostal muscles, and accessory muscles such as the sternocleidomastoid, serratus anterior, pectoralis major, and scalene muscles.