( It ( ( forms ( ( the ( epithelial lining ) ) ( of ( ( ( ( ( ( the whole ) ( of ( the ( digestive tube ) ) ) ) ( except part ) ) ( of ( ( ( the ( ( mouth and ) pharynx ) ) and ) ( the ( terminal part ) ) ) ) ) ( of ( the rectum ) ) ) ( -LRB- ( ( which ( are ( lined ( by ( involutions ( of ( the ectoderm ) ) ) ) ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ forms) (NP (NP (DT the) (JJ epithelial) (NN lining)) (PP (IN of) (NP (NP (DT the) (NN whole)) (PP (IN of) (NP (DT the) (JJ digestive) (NN tube))) (PP (IN except) (NP (NN part))) (PP (IN of) (NP (NP (DT the) (NN mouth) (CC and) (NN pharynx)) (CC and) (NP (DT the) (NN terminal) (NN part)))) (PP (IN of) (NP (DT the) (NN rectum))) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBN lined) (PP (IN by) (NP (NP (NNS involutions)) (PP (IN of) (NP (DT the) (NN ectoderm))))))))) (-RRB- -RRB-)))))) (. .)))
It forms the epithelial lining of the whole of the digestive tube except part of the mouth and pharynx and the terminal part of the rectum (which are lined by involutions of the ectoderm).
(ROOT (S (NP (DT The) (NN pharynx)) (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 joins) (NP (DT the) (NN mouth)) (PP (TO to) (NP (DT the) (ADJP (JJ digestive) (CC and) (JJ respiratory)) (NNS tracts)))))))))) (. .)))