Which French physiologist became Claude Bernard’s teacher and mentor?

The French physiologist who served as Claude Bernard’s teacher and mentor was François Magendie.

Bernard studied under Magendie at the Hôtel-Dieu and the Collège de France during the early 1840s. Recognizing Bernard’s skill in dissection, Magendie hired him as a research assistant, a role in which Bernard contributed to studies on spinal nerves and other physiological topics. Magendie’s influence was significant to Bernard’s intellectual development, though Bernard later advanced the field by emphasizing the necessity of using a guiding hypothesis in experimental research, a practice that differed from Magendie’s purely empirical approach.123