<prompt> Deep inguinal ring is a defect in aponeurosis of:External oblique muscle of abdomenInternal oblique muscle of abdomenTransverse abdominis muscleTransversalis fascia  <response>: Ans. d Transversalis fasciaRef: Bailey Love 26th ed. 955 Deep inguinal ring is the opening in the transversalis fascia through which the ductus deferens and gonadal vessels or round ligament in the female enter the inguinal canal. Located midway between anterior superior iliac spine and pubic tubercle, it is bounded medially by the lateral umbilical fold inferior epigastric vessels and inferiorly by the ilio-pubic tract. Indirect inguinal hernias exit the abdominal cavity through the deep inguinal ring. 