Covering of Spermatic Cord

The coverings of the spermatic cord include the external spermatic fascia, cremaster muscle, and internal spermatic fascia. The coverings are originally part of the abdominal wall. The external spermatic fascia is part of the external abdominal oblique and contains the dartos muscle. The dartos muscle is a layer of smooth muscle and is responsible for the wrinkling of the scrotal skin. The cremaster muscle is part of the internal abdominal oblique. The role of the cremaster muscle is to pull the scrotum in towards the body when it is cold. The body heat would ensure that the testes are at the right temperature for sperm production. When it is too warm the cremaster muscle would relax and the scrotum would be further from the body. The internal spermatic fascia is part of the transversalis fascia.