In Greek, especially early poetry, the φρήν is the seat of emotion - particularly fear, joy, grief, anger. In the plural, it's a physical part of the body, but it's not completely clear what it is. Generally, it is translated as "midriff." Eg, Iliad 16. 481: But Patroclus in turn rushed on with the bronze, and not in vain did the shaft speed from his hand, but smote his foe where the midriff (φρένες) is set close about the throbbing heart. It's also the seat of the mind and mental faculties such as thought, imagination, etc.

Close to the English is the Greek ἦτορ and καρδία ,which both mean the physical heart, the source of life, and the location of feelings, passion, etc. Strangely enough, Thucydides takes the καρδία to physically mean the stomach.

In tragedy, the liver, ἧπαρ, is often assumed to be the bodily location of strong emotions particularly fear, anger, and love.