9.5 Types of Body Movements - Anatomy and Physiology 2e
https://openstax.org/books/anatomy-and-physiology-2e/pages/9-5-types-of-body-movements
WEBFlexion and extension are typically movements that take place within the sagittal plane and involve anterior or posterior movements of the neck, trunk, or limbs. For the vertebral column, flexion (anterior flexion) is an anterior (forward) bending of the neck or trunk, while extension involves a posterior-directed motion, such as straightening ...
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