( ( Both ( ( ( the brain ) and ) ( the ( spinal cord ) ) ) ) ( ( are ( covered ( with ( ( three layers ) ( of ( membranes ( ( ( called meninges ) and ) ( bathed ( in ( ( ( cerebrospinal fluid ) , ) ( which ( ( cushion them ) ( against ( the ( encasing bones ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Both) (NP (DT the) (NN brain)) (CC and) (NP (DT the) (JJ spinal) (NN cord))) (VP (VBP are) (VP (VBN covered) (PP (IN with) (NP (NP (CD three) (NNS layers)) (PP (IN of) (NP (NP (NNS membranes)) (VP (VP (VBN called) (NP (NNS meninges))) (CC and) (VP (VBN bathed) (PP (IN in) (NP (NP (JJ cerebrospinal) (NN fluid)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VB cushion) (NP (PRP them)) (PP (IN against) (NP (DT the) (JJ encasing) (NNS bones)))))))))))))))) (. .)))
Both the brain and the spinal cord are covered with three layers of membranes called meninges and bathed in cerebrospinal fluid, which cushion them against the encasing bones.
(ROOT (S (NP (NP (DT The) (CD three) (NNS layers)) (PP (IN of) (NP (NP (JJ protective) (NNS coverings)) (PP (IN of) (NP (DT the) (JJ spinal) (NN cord)))))) (VP (VBZ is) (VP (VBN called) (NP (DT the) (NNS meninges)))) (. .)))