Which structure protrudes from the hypothalamus and processes olfactory sensation?

Which structure protrudes from the hypothalamus and processes olfactory sensation?

• A. Mammillary bodies
• B. Pituitary gland
• C. Amygdala
• D. Hippocampus

Answer: (A)

The mammillary bodies are two small, rounded protrusions on the underside of the hypothalamus and are part of the limbic system. They receive input from the hippocampus via the fornix and project to the thalamus, forming a pathway important for recollective memory. Smell memories often rely on limbic circuits that connect memory with olfactory processing, so this structure’s role in linking memory to olfactory information explains why it’s described as involved with olfactory sensation. The other options don’t protrude from the hypothalamus: the pituitary is connected below by the infundibulum but isn’t a surface protrusion; the amygdala and hippocampus are part of the limbic system but are not projections from the hypothalamus.

The mammillary bodies are two small, rounded protrusions on the underside of the hypothalamus and are part of the limbic system. They receive input from the hippocampus via the fornix and project to the thalamus, forming a pathway important for recollective memory. Smell memories often rely on limbic circuits that connect memory with olfactory processing, so this structure’s role in linking memory to olfactory information explains why it’s described as involved with olfactory sensation. The other options don’t protrude from the hypothalamus: the pituitary is connected below by the infundibulum but isn’t a surface protrusion; the amygdala and hippocampus are part of the limbic system but are not projections from the hypothalamus.