( ( ( The walls ) ( of ( the pharynx ) ) ) ( ( consist ( of ( ( ( two layers ) ( of fascia ) ) ( which ( surround ( ( a series ) ( of muscles ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS walls)) (PP (IN of) (NP (DT the) (NN pharynx)))) (VP (VBP consist) (PP (IN of) (NP (NP (CD two) (NNS layers)) (PP (IN of) (NP (NN fascia))) (SBAR (WHNP (WDT which)) (S (VP (VBP surround) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NNS muscles)))))))))) (. .)))
The walls of the pharynx consist of two layers of fascia which surround a series of muscles.
(ROOT (S (NP (NP (DT The) (NN pleura)) (SBAR (WHNP (WDT that)) (S (VP (VBZ surrounds) (NP (DT the) (NNS lungs)))))) (VP (VBZ consists) (PP (IN of) (NP (CD two) (NNS layers)))) (. .)))