Allow your lab partner to rotate passively your trunk, then try to inhale deeply. Describe how a rotated trunk posture alters your ability to inhale deeply. Relate this observation to the influence of trunk rotation on rib movement. Predict how a structural scoliosis affects breathing mechanics. Compare your thoughts with those of a brief commentary on this question.
Inspiration requires concentric activity in the diaphragm .
Intervertebral joints below C2 are triaxial. Examine the orientation of the facet joints in the cervical spine. Examine a model spine to understand how the facets' orientations cause sidebending and rotation to be coupled ipsilaterally in the cervical spine. At a given intervertebral joint, the facet joint surfaces lie in a plane. At the more superior cervical intervertebral joints, the planes lie closer to a horizontal plane.