<prompt> Layers which are penetrated with trochar cannula in production of pneumoperitoneum areSkin superficial fasciaDeep fasciaRectus abdominisTransversus abdominis  <response>: .CO2 is commonly used to create pneumoperitoneum as- It is readily available It is cheaper It suppresses the combustion It is easily absorbed by tissues It has a high diffusion coefficient It is quickly released respiration Other gases used are: Air, nitrous oxide, helium, argon.Pneumoperitoneum is created up to a pressure of 15 mmHg which distends the abdominal cavity adequately to have proper visualisation of the abdominal contents. Laparoscope is inseed through the umbilical po 10 mm. Abdomen is evaluated for any pathology. Liver, gallbladder, pelvic organs are visualised. Additional pos 3-4 through trocars are placed depending on the procedure to be done. It may be eitherm5 mm po or 10 mm po. These pos are placed in such a way to have a proper triangulation of instruments for dissection.To use clip applicator 10 mm po is required.Pneumoperitoneum is created using veress needle through umbilical incision. Access can be achieved by open method through an umbilical incision. ref:SRB;S manual of surgery,ed 3,pg no 1140 