( This ( ( produces ( ( ( ( rhythmic ( ( flexion and ) extension ) ) ( of ( midline structures ) ) ) and ) ( ( external ( and ( internal rotation ) ) ) ( of ( ( paired structures ) ( in ( the body ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ produces) (NP (NP (NP (JJ rhythmic) (NN flexion) (CC and) (NN extension)) (PP (IN of) (NP (JJ midline) (NNS structures)))) (CC and) (NP (NP (JJ external) (CC and) (JJ internal) (NN rotation)) (PP (IN of) (NP (NP (JJ paired) (NNS structures)) (PP (IN in) (NP (DT the) (NN body)))))))) (. .)))
This produces rhythmic flexion and extension of midline structures and external and internal rotation of paired structures in the body.
(ROOT (S (NP (JJ Medial) (NN rotation)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (NN rotation)) (PP (IN of) (NP (NP (DT a) (NN bone)) (PP (IN toward) (NP (NP (DT the) (NN midline)) (PP (IN of) (NP (DT the) (NN body))))))))))) (. .)))