Circles located on underside of back legs, what are they?

[TeacherChel]

I know it has been asked in the past, but I can't seem to locate the post. What are the circle things that are underneath a BD's back legs. The run in a line from the left side to the right. For the life of me I can't remember what the answer is.

 

[lillybd2008]

Are you thinking of the Femoral Pores?