1. An arched anatomical structure, especially the arched white matter tract in the brain that connects the hippocampus to other regions.
Usage: anatomy; neuroscience
2. In classical architecture, an arched or vaulted structure; a vault or arch.
Usage: architecture; historical

Examples

• The fornix is a major white matter tract in the limbic system of the brain.
• Damage to the fornix can result in memory impairment.
• In Roman architecture, the fornix was a common structural element in buildings and aqueducts.
• The fornix connects the hippocampus to the mammillary bodies and other brain regions.
• Neuroimaging studies often examine the fornix to understand memory-related brain function.