Solution:
The septum in the scrotum is made up of a subcutaneous layer and muscular tissue called dartos muscle, which is composed of bundles of smooth muscle fibres. Dartos muscles help in expanding and contracting scrotum skin. Contraction decreases the surface area for heat loss and expanding increases the surface area which helps in maintaining scrotum temperature. The Cremaster muscles which are composed of skeletal muscle fibres cover testis. They help in moving testes towards the abdomen to maintain the temperature. Along with connective tissue, the Cremaster muscle forms the spermatic cord.