Are the ribs cover by the visceral serosa?

No, the ribs are not covered by the visceral serosa. Instead, the visceral serosa is a membrane that covers the organs within the thoracic and abdominal cavities, such as the lungs and the intestines. The ribs, being part of the skeletal system, are covered by a layer of periOSteum, which is a dense connective tissue that surrounds bones.