Fig. 25-7. Inguinal ligament (inset), inguinal canal, and layers of scrotum. The main diagram combines two planes: that of the inguinal ligament and a sagittal plane through the scrotum. The separation of the layers is exaggerated. The fascia transversalis forms most of the posterior wall of the inguinal canal and is prolonged along the ductus deferens as the internal spermatic fascia. Click for high resolution image.