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Quotation from The Canon of Medicine, Book I by Ibn Sina (Avicenna)
“But physicians still keep to the opinion that the brain is the chief seat of sentient life, and that each sense has its own distinct member whereby it manifests function.”
The Canon of Medicine, Book I, Part 1, para. 141 (the faculties), trans. O. Cameron Gruner (1930)

After giving Aristotle's view that the heart is the source of all faculties, Ibn Sina contrasts the physicians' Galenic view, which he then calls superficial.
Citation: "But physicians still keep to the opinion that the brain is the chief seat of sentient life, and that each sense has its own distinct member whereby it manifests function." — Ibn Sina (Avicenna), The Canon of Medicine, Book I, Part 1, para. 141 (the faculties), trans. O. Cameron Gruner (1930). (id avicenna-canon-of-medicine-book-i-q2)
Portrait: Avicenne., Unknown engraver, CC0.
