Ok Back Muscles, very complicated at first. But again with the help of landmarks it can be easily laid out. Latissiumus Dorsi (attatchments: origin, from the Spinious process of the six last thoracic vertebrae and all the lumbar vertebrae: from the sacral vertebrae; from the iliac tuberosity; from posterior third of the iliac crest) is a thin muscle that covers quite a big section of the back. However when the body is articulated other muscles such as the Serratus Anterior/interior the spinal erectors which are big clumps of muscle that look like think columns at the base of your back.
First look at the Deltoids, which form the big bulk at the top of the arm: Attachments origin, from the clavicle (lateral third of the anterior border) from the scapula and its external border of the acromion all attaching to the Humerus. Another example of the clavicle being a big landmark to place.
Above is the Trapezius, it attaches to several landmarks, being the Seventh cervical vertebrae, Clavicle (Acromion process) and finally the medial border of the Scapula.
In these two images the Scapula Section of the Deltoid (labelled 6 for image above and 1 for image to the left) it shows that the muscles tendon that travels back to the scapula. In this space there wouldn't be any deformation as the tenders don't contract so it key when placing these muscles I think about the tendons as these will be mostly flat areas.
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