Nervous tissue is derived from the ectoderm, connective tissues are derived from mesoderm, and gut is derived from the endoderm.
nˈɜːvəs tˈɪʃuː ɪz dᵻɹˈaɪvd fɹʌmðɪ ˈɛktoʊdˌɜːm, kənˈɛktɪv tˈɪʃuːz ɑːɹ dᵻɹˈaɪvd fɹʌm mˈɛsoʊdˌɜːm, ænd ɡˈʌt ɪz dᵻɹˈaɪvd fɹʌmðɪ ˈɛndoʊdˌɜːm.