How does the contraction of intercoastal muscles make the rib cage move upward and outward? - Quora
Intercostals | Rehab My Patient
External intercostal muscles - Wikipedia
Rib cage anatomy in Homo erectus suggests a recent evolutionary origin of modern human body shape | Nature Ecology & Evolution
External rib structure can be predicted using mathematical models: An anatomical study with application to understanding fractures and intercostal muscle function - Casha - 2015 - Clinical Anatomy - Wiley Online Library