The definition of theme can be broken into two categories: the thematic concept of a work and the thematic statement. The thematic concept refers to what a reader understands the work to be about, while the thematic statement refers to what the work says about that subject in question.
Latissimus Dorsi Anatomy Study. Origin: Spinous processes of thoracic T7-T12, 9th to 12th ribs, the lumbar and sacral vertebrae (via the thoracolumbar fascia), and the posterior third of the external lip of the iliac crest. Occasionally by a slip from the posterior surface of the inferior angle of the scapula.
The latissimus dorsi is the widest muscle in the human body and is  also known as the lats. Yes, the latissimus dorsi does compress the  abdomen.