( ( A ( vas deferens ) ) ( ( is ( ( a ( long ( , ( narrow tube ) ) ) ) ( that ( ( carries ( sperm ( from ( the epididymis ) ) ) ) ( to ( ( the ( seminal vesicles ) ) ( during ejaculation ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN vas) (NNS deferens)) (VP (VBZ is) (NP (NP (DT a) (JJ long) (, ,) (JJ narrow) (NN tube)) (SBAR (WHNP (WDT that)) (S (VP (VBZ carries) (NP (NP (NN sperm)) (PP (IN from) (NP (DT the) (NNS epididymis)))) (PP (TO to) (NP (NP (DT the) (JJ seminal) (NNS vesicles)) (PP (IN during) (NP (NN ejaculation)))))))))) (. .)))
A vas deferens is a long, narrow tube that carries sperm from the epididymis to the seminal vesicles during ejaculation.
(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)))))))))))) (. .)))