( ( T ( he ( penis ( consists ( of ( ( three tubes ) ( of ( ( ( ( tissue , ) ( one ( containing ( the urethra ) ) ) ) and ) ( ( two ( long tubes ) ) ( filled ( with ( spongy tissue ) ) ) ) ) ) ) ) ) ) ) ) ( , ( ( called ( ( corpora , ) ( which ( swell ( when ( ( ( engorged ( with blood ) ) , ) ( producing ( an erection ) ) ) ) ) ) ) ) . ) ) )
(ROOT (SINV (S (ADVP (RB T)) (NP (PRP he)) (ADVP (RB penis)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD three) (NNS tubes)) (PP (IN of) (NP (NP (NN tissue)) (, ,) (NP (NP (CD one)) (VP (VBG containing) (NP (DT the) (NN urethra)))) (CC and) (NP (NP (CD two) (JJ long) (NNS tubes)) (VP (VBN filled) (PP (IN with) (NP (JJ spongy) (NN tissue))))))))))) (, ,) (VP (VBD called)) (NP (NP (NN corpora)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP swell) (SBAR (WHADVP (WRB when)) (S (VP (VBD engorged) (PP (IN with) (NP (NN blood))) (, ,) (S (VP (VBG producing) (NP (DT an) (NN erection))))))))))) (. .)))
T he penis consists of three tubes of tissue, one containing the urethra and two long tubes filled with spongy tissue, called corpora, which swell when engorged with blood, producing an erection.
(ROOT (S (NP (DT The) (JJ human) (NNS penis)) (VP (VBZ contains) (NP (NP (DT the) (NN urethra)) (, ,) (CONJP (RB as) (RB well) (IN as)) (NP (NP (CD three) (NNS cylinders)) (PP (IN of) (NP (ADJP (RB spongy) (JJ erectile)) (NN tissue)))))) (. .)))
The human penis contains the urethra, as well as three cylinders of spongy erectile tissue.