Sentence:  Except for the coxal socket, the most constant landmarks of the subcoxal region are the midventral <WSD>discrimen</WSD>, resulting from the meeting of opposite subcoxae whose contiguous margins have been infolded posteriorly to form the sternal apophyses, and the pleural suture extending from the dorsal articulation of the coxa  to the pleural wing process. 
Meaning of the word marked with <WSD> tags:  A visible dividing line where two structures come together.