Which one of the following muscles is primarily an accessory muscle of respiration?

Name: Which one of the following muscles is primarily an accessory muscle of respiration?
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Question

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The serratus posterior superior muscle is primarily an accessory muscle of respiration, aiding in elevating the ribs during deep inhalation. The latissimus dorsi, serratus anterior, and erector spinae group are all primarily involved in movements of the back, shoulders, and arms, and are not directly involved in respiration.

Which One of the Following Muscles Is Primarily an Accessory