Where do the intercostal muscles originate?

The intercostal muscles originate from the inferior border of the ribs, specifically the lower edge of the first eleven ribs. This anatomical feature is crucial for their function in assisting with the mechanics of breathing. As these muscles contract, they elevate the ribcage, allowing for expansion of the thoracic cavity and aiding both inhalation and exhalation.

The choice highlighting the ribs 2-12 would not be accurate since the first rib is essential for the complete function of the intercostal muscles. Moreover, while the xiphoid process and iliac crest are important landmarks in the human body, they are not associated with the origin of the intercostal muscles, which directly involve the ribs for their attachment and functional role. Understanding the anatomy and origin of these muscles is fundamental for topics related to respiratory mechanics and sports massage therapy.