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The intercostal muscles are located between the ribs and play a crucial role in the mechanics of breathing by aiding in the expansion and contraction of the thoracic cavity. Their insertion points are specifically on the ribs.
The correct answer highlights that the intercostal muscles insert from rib 2 to rib 12. This means they span the space between these particular ribs and facilitate the movement necessary for respiration. Each intercostal muscle is attached to the inferior borders of the ribs above and the superior borders of the ribs below, allowing them to lift and expand the rib cage during inhalation.
The other options do not accurately reflect the anatomical positioning of the intercostal muscles. The insertion section does not extend to other structures such as the xiphoid process, the aponeurosis of the linea alba, or ribs outside of the 2-12 range, which reinforces that ribs 2-12 are indeed the correct basis for their anatomical attachments. Understanding the specific insertion points aids in recognizing their function within the respiratory system and provides foundational knowledge for sports massage and related fields.