( There ( ( is ( ( ( ( a ( small ( cartilage disc ) ) ) ( between ( your ( lower jaw ) ) ) ) and ) ( skull ( in ( the joint ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (NP (NP (DT a) (JJ small) (NN cartilage) (NN disc)) (PP (IN between) (NP (PRP$ your) (JJR lower) (NN jaw)))) (CC and) (NP (NP (NN skull)) (PP (IN in) (NP (DT the) (NN joint)))))) (. .)))
There is a small cartilage disc between your lower jaw and skull in the joint.
(ROOT (S (NP (NNS Hagfishes)) (VP (VBP have) (NP (NP (DT a) (NN skull)) (VP (VBN made) (PP (IN of) (NP (NN cartilage)))))) (. .)))