( Reticular ( ( formation ( ( A network ) ( of ( ( nerve fibers ) ( located ( in ( ( the center ) ( of ( ( the medulla ) ( that ( helps ( regulate ( attention ( , ( arousal ( , ( and sleep ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Reticular)) (VP (VBZ formation) (NP (NP (DT A) (NN network)) (PP (IN of) (NP (NP (NN nerve) (NNS fibers)) (VP (VBN located) (PP (IN in) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (NP (DT the) (NN medulla)) (SBAR (WHNP (WDT that)) (S (VP (VBZ helps) (VP (VB regulate) (NP (NN attention) (, ,) (NN arousal) (, ,) (CC and) (NN sleep))))))))))))))) (. .)))
Reticular formation A network of nerve fibers located in the center of the medulla that helps regulate attention, arousal, and sleep.
(ROOT (S (NP (JJ Reticular) (NN formation)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (NN formation)) (SBAR (WHNP (WDT that)) (S (VP (VBZ regulates) (NP (NN sleep) (CC and) (NN arousal))))))))) (. .)))