( ( ( Extrinsic ( and ( Intrinsic Muscles ) ) ) ( of ( the Back ) ) ) . )
(ROOT (NP (NP (NNP Extrinsic) (CC and) (NNP Intrinsic) (NNPS Muscles)) (PP (IN of) (NP (DT the) (NNP Back))) (. .)))
Extrinsic and Intrinsic Muscles of the Back.
(ROOT (S (NP (JJ Intrinsic) (NNS muscles)) (VP (VBP allow) (NP (PRP$ your) (NNS fingers)) (S (VP (TO to) (VP (ADVP (RB also)) (VB make) (NP (NP (JJ precise) (NNS movements)) (PP (IN for) (NP (NNS actions)))))))) (. .)))