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What difference between the origin and insertion of a muscle?

The origin of a muscle is where the muscle starts ("the starting point"). The insertion of a muscle is where the muscle ends ("the ending point"). Also, the insertion of t (MORE)

What is the origin and insertion of the psoas muscle?

  Origin   Psoas major originates along the lateral surfaces of the vertebral bodies of TXII and LI-LIV and their associated invertebral discs. Psoas minor, present i (MORE)