( ( a -RRB- ) ( ductus ( ( ( deferens ( -- ( ( ( epididymis -- ) ( ejaculatory duct ) ) -- ) ) ) urethra ) . ) ) )
(ROOT (S (LST (LS a) (-RRB- -RRB-)) (NP (NNS ductus)) (VP (VBZ deferens) (PRN (: --) (NP (NP (NNS epididymis)) (: --) (NP (JJ ejaculatory) (NN duct))) (: --)) (NP (NN urethra))) (. .)))
a) ductus deferens---epididymis---ejaculatory duct---urethra.
(ROOT (S (NP (DT A) (NN vas) (NNS deferens)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (NN tube)) (SBAR (WHNP (WDT that)) (S (VP (VBZ carries) (NP (NN sperm)) (PP (IN from) (NP (NP (DT the) (NNS epididymis)) (PP (TO to) (NP (DT the) (NN urethra)))))))))))) (. .)))