<prompt> Cervical pa of esophagus all are true except?Arise at cricoid levelSite of poosystemic anastomosisForeign body obstruction common at this levelStriated muscle fibres positive  <response>: Poosystemic Poo caval anastomosis is seen in lower pa abdominal pa of esophagus.Cervical esophagus begins at lower border of cricoid cailage at C6 veebral level as a downward continuation of pharynx.Muscularis externa of cervical esophagus contains only skeletal muscle striated muscle fibers.Foreign body obstruction is common in this pa of esophagus. 