Externally, this structure contains an irregular ridge known as the raphe, and its appearance is primarily determined by the actions of the dartos and cremaster muscles.  The gubernaculum attaches the developmental predecessor of this structure to nearby organs; the failure of those organs to traverse the inguinal canals and reside in this structure is known as cryptorchidism.  When the dartos and cremaster muscles contract, this structure becomes smaller and more wrinkl
Externally, this structure contains an irregular ridge known as the raphe, and its appearance is primarily determined by the actions of the dartos and cremaster muscles.  The gubernaculum attaches the developmental predecessor of this structure to nearby organs; the failure of those organs to traverse the inguinal canals and reside in this structure is known as cryptorchidism.  When the dartos and cremaster muscles contract, this structure becomes smaller and more wrinkled to ensure the correct temperature for gamete formation.  For 10 points, identify this supporting structure of the male reproductive system, a sac that contains the testes.
Externally, this structure contains an irregular ridge known as the raphe, and its appearance is primarily determined by the actions of the dartos and cremaster muscles.  
scrotum