Which of the following is not a permanent mucosal fold?: (A) Spiral valve of heister, (B) Gastric rugae, (C) Plica semilunaris, (D) Transverse rectal fold
Answer is B. The gastric folds (or gastric rugae) may be seen during esophagogastroduodenoscopy or in radiological studies. They provide the stomach with increased surface area for nutrient absorption . image ref - britannica.com