( ( ( ( ( The ( sperm membrane ) ) ( must ( fuse ( with ( the ( oocyte membrane ) ) ) ) ) ) and ) ( ( the ( sperm head ) ) ( ( along ( with ( associated parts ) ) ) ( must ( be ( drawn ( into ( the ( the egg ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN sperm) (NN membrane)) (VP (MD must) (VP (VB fuse) (PP (IN with) (NP (DT the) (JJ oocyte) (NN membrane)))))) (CC and) (S (NP (DT the) (NN sperm) (NN head)) (ADVP (IN along) (PP (IN with) (NP (JJ associated) (NNS parts)))) (VP (MD must) (VP (VB be) (VP (VBN drawn) (PP (IN into) (NP (DT the) (DT the) (NN egg))))))) (. .)))
The sperm membrane must fuse with the oocyte membrane and the sperm head along with associated parts must be drawn into the the egg.
(ROOT (S (NP (NP (DT The) (NN head)) (PP (IN of) (NP (DT the) (NN sperm)))) (VP (VBZ contains) (NP (DT the) (NN nucleus))) (. .)))
The head of the sperm contains the nucleus.