( ( ( ( ( ( ( The patches ) ( contain ( ( ( sensory ( hair cells ) ) , ) ( which ( ( detect ( ( relative movement ) ( of fluid ) ) ) ( ( ( ( in ( the ( semicircular canals ) ) ) , ) or ) ( of ( ( the otoliths ) ( in ( the ear ) ) ) ) ) ) ) ) ) ) , ) and ) so ) ( enable ( the ( fish ( ( ( to hear ) and ) ( to ( balance correctly ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NNS patches)) (VP (VBP contain) (NP (NP (JJ sensory) (NN hair) (NNS cells)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP detect) (NP (NP (JJ relative) (NN movement)) (PP (IN of) (NP (NN fluid)))) (PP (PP (IN in) (NP (DT the) (JJ semicircular) (NNS canals))) (, ,) (CC or) (PP (IN of) (NP (NP (DT the) (NNS otoliths)) (PP (IN in) (NP (DT the) (NN ear)))))))))))) (, ,) (CC and) (RB so) (S (VP (VB enable) (NP (DT the) (NN fish) (S (VP (VP (TO to) (VP (VB hear))) (CC and) (VP (TO to) (VP (VB balance) (ADVP (RB correctly))))))))) (. .)))
The patches contain sensory hair cells, which detect relative movement of fluid in the semicircular canals, or of the otoliths in the ear, and so enable the fish to hear and to balance correctly.
(ROOT (NP (NP (NP (DT The) (NN hair) (NNS cells) (NN sense)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (ADJP (JJ liquid) (PP (IN in) (NP (NN ear)))) (NNS canals)))) (. .)))