Sentence:  The pulmonary vein , however , without the limiting supportive tissue septa as in type 1 , , follows a more direct path to the <WSD>hilum</WSD> and does not maintain this close relationship ( figs. 8 , 22 ) . 
Meaning of the word marked with <WSD> tags:  (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ