Figure 6b. (a) Transverse T2-weighted fast spin-echo (2,826/120) MR image obtained with an endovaginal coil and (b) corresponding drawing in an asymptomatic 31-year-old female volunteer show the vaginal wall (VW), puborectal muscle (PR), urethral smooth muscle (SM) and striated muscle (ST), urethral mucosa and submucosa (MS), urethropelvic (or parapelvic) ligament (UP) and parapelvic ligament (PU), anorectum (A), and internal anal sphincter (IS).