( ( ( ( i -RRB- ) ( ( ( Somatic ( motor neurons ) ) ( - ( ( by definition ) ( , ( ( ( contact ( skeletal ( muscles ( ii ( -RRB- ( Autonomic motor ) ) ) ) ) ) neurons ) - ) ) ) ) ) ( by ( ( ( ( ( ( definition , ) ( contact ( cardiac muscle ) ) ) , ) ( smooth muscle ) ) or ) glands ) ) ) ) 3 ) . )
(ROOT (S (VP (VBD i) (-RRB- -RRB-) (NP (NP (NP (JJ Somatic) (NN motor) (NNS neurons)) (PRN (: -) (PP (IN by) (NP (NN definition))) (, ,) (NP (NP (NN contact) (JJ skeletal) (JJ muscles) (NN ii) (-RRB- -RRB-) (JJ Autonomic) (NN motor)) (NP (NNS neurons))) (: -))) (PP (IN by) (NP (NP (NN definition)) (, ,) (NP (NN contact) (JJ cardiac) (NN muscle)) (, ,) (NP (JJ smooth) (NN muscle)) (CC or) (NP (NNS glands))))) (NP (CD 3))) (. .)))
i) Somatic motor neurons- by definition, contact skeletal muscles ii) Autonomic motor neurons- by definition, contact cardiac muscle, smooth muscle or glands 3.
(ROOT (S (NP (DT The) (NN motor) (NN system)) (VP (VBZ consists) (PP (IN of) (NP (NP (NNS neurons)) (SBAR (WHNP (WDT that)) (S (VP (VBP carry) (NP (NNS signals)) (PP (TO to) (NP (JJ skeletal) (NNS muscles))))))))) (. .)))
The motor system consists of neurons that carry signals to skeletal muscles.