( The ( parasympathetic ( system . ) ) )
(ROOT (NP (DT The) (JJ parasympathetic) (NN system) (. .)))
The parasympathetic system .
(ROOT (S (NP (DT The) (JJ parasympathetic) (NN system)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (VP (VBN referred) (S (VP (TO to))) (PP (IN as) (NP (DT the) (JJ craniosacral) (NN system)))))) (. .)))