The<unk> is a cervical barrier type of birth control.  It is a soft latex or silicone dome with a spring molded into the rim.  The spring creates a seal against the walls of the vagina.
Diaphragm 
Internal intercostal muscles
Chylopericardium
External intercostal muscles
Intercostal muscle
Abdominal wall
Gumma 
Subcostales muscle