Final answer:
The serrates posterior muscles are not explicitly defined in the information provided, but may refer to muscles that participate in elevating or depressing the ribs during respiration.
Step-by-step explanation:
The serrates posterior muscles are associated with the movements of the rib cage. While the question asks about the serrates posterior specifically, it is important to clarify that there are two relevant sets of muscles: the serratus anterior, which is a large and flat muscle that originates on the ribs and inserts onto the scapula, and the intercostal muscles which draw the ribs together during the process of breathing. When the intercostal muscles contract, they reduce the space between the ribs, facilitating the movements involved in respiration. However, the serrates posterior muscles are not clearly defined in the provided information, which could likely refer to either the serratus posterior superior, which elevates the ribs during inhalation, or the serratus posterior inferior, which depresses the ribs during exhalation.