Final answer:
The statement about the thalamus being larger on the left side is incorrect; while other brain asymmetries, such as language lateralization and the course of the lateral fissure, are noteworthy distinctions.
Step-by-step explanation:
The statement in the question that is incorrect and does not represent a true anatomical asymmetry in the brain is the claim that the thalamus is larger on the left side than on the right. In truth, anatomical differences between the hemispheres do exist, such as the language-related functions predominantly localized in the left hemisphere for most individuals. Moreover, the lateral fissure does indeed take a steeper upward course on the right, and neurons in the left hemisphere's Broca's area tend to have larger dendritic fields. Additionally, though the representation of sensory and motor functions can vary, the assertion about the region of the sensory and motor cortex being larger on one side uniformly is not widely supported.