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How are heart and brain among vertebrates homologous organs? Please answer.

homologous organs means that they are similar in structure but perform different function.

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Yes, brains ?as well as of hearts of all vertebrates ?(from fishes to mammals) are homologous organs. Brains of all vertebrates are developed in a similar manner which is easily observed during embryonic development in all vertebrates. All of them have three lobes of brain and similar further divisions ?and their brain is covered by meninges. ?Same way, hearts of all vertebrates are homologous organs consisting of cardiac tissues and connective tissue.
Development of (or the evolution of) vertebra enabled species to move the brain towards the front so that it could occupy its own place and also grow (within limits). In many non-vertebrates, the ?brain? actually called?ganglia?were around the digestive system.
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Homologous organs means that they are similar in structure but perform different function.
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Homologous structures or organs are a result of divergent evolution,i.e., they share common ancestry. In case of brain, it performs similar structure and function in all fishes, amphibians, reptiles birds and mammals. Thus they show common ancestry. Therefore, they are homologous from ancestry point of view and not different function point of view. Similar is the case of heart. They are similar in structure and function. All show arrangement of auricles and ventricles although in varying numbers but similiar basic structures.
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