The mesencephalon is ancient in origin, meaning its general architecture is shared with the most ancient of vertebrates. Dopamine produced in the "substantia nigra" plays a role in motivation and habituation of species from humans to insects.= = = Dakota Fanning = = =
ð ə WORD_BOUNDARY m ɛ s ə n s ɛ f æ l ə n WORD_BOUNDARY ɪ z WORD_BOUNDARY eɪ n t̠ʃ ə n t WORD_BOUNDARY ɪ n WORD_BOUNDARY ɔ ɹ ɪ d̠ʒ ɪ n WORD_BOUNDARY m iː n ɪ ŋ WORD_BOUNDARY ɪ t s WORD_BOUNDARY d̠ʒ ɛ n ə ɹ ɹ ə l WORD_BOUNDARY ɑ ɹ k ɪ t ɛ k t̠ʃ ə ɹ ɹ WORD_BOUNDARY ɪ z WORD_BOUNDARY ʃ ɛ ɹ d WORD_BOUNDARY w ɪ ð ð ə WORD_BOUNDARY m oʊ s t WORD_BOUNDARY eɪ n t̠ʃ ə n t WORD_BOUNDARY ʌ v WORD_BOUNDARY v ɜː t ɪ b ɹ eɪ t s WORD_BOUNDARY d ɑ p ʌ m iː n WORD_BOUNDARY p ɹ ə d uː s t WORD_BOUNDARY ɪ n ð ə WORD_BOUNDARY s ə b s t æ n ʃ ə WORD_BOUNDARY n ɪ ɡ ɹ ə WORD_BOUNDARY p l eɪ z WORD_BOUNDARY ʌ WORD_BOUNDARY ɹ oʊ l WORD_BOUNDARY ɪ n WORD_BOUNDARY m oʊ t ɪ v eɪ ʃ ə n WORD_BOUNDARY æ n d WORD_BOUNDARY h æ b ɪ t̠ʃ uː eɪ ʃ ə n WORD_BOUNDARY ʌ v WORD_BOUNDARY s p iː s iː z WORD_BOUNDARY f ɹ ʌ m WORD_BOUNDARY h j uː m ə n z WORD_BOUNDARY t ʊ WORD_BOUNDARY ɪ n s ɛ k t s WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY d ʌ k oʊ t ə WORD_BOUNDARY f æ n ɪ ŋ WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY