Sentence:  Also three other direct pathways of alveolar bronchial arterial supply were noted : via the <WSD>pleura</WSD> ; through the interlobular septa ; and along the terminal bronchiole ( figs. 14 , 17 , 18 , 19 ) . 
Meaning of the word marked with <WSD> tags:  the thin serous membrane around the lungs and inner walls of the chest