Diencephalon and limbic system - components and functions

Where is the diencephalon located?

• Between the cerebral hemispheres and the brainstem

What structures make up the diencephalon?

Locate them on a brain

• Thalamus

• Hypothalamus

• Epithalamus

Where is the thalamus located?

• Part of the diencephalon; superior to the hypothalamus

What is the main function of the thalamus?

• Relay station for information entering the cerebral cortex

What sensory functions does the thalamus perform?

• Processes and integrates sensory input; relays it to the correct cortical destination

What motor function does the thalamus perform?

• Relays motor adjustments from basal nuclei and cerebellum to motor cortex

Where is the hypothalamus located?

• Part of the diencephalon

• Inferior to the thalamus

What is the main function of the hypothalamus?

• Regulates autonomic nervous system and maintains homeostasis

What homeostatic functions does the hypothalamus regulate?

• Body temperature

• Hunger

• Satiety

• Thirst

• Sleep–wake cycles

What emotional functions does the hypothalamus control?

• Initiates physical responses to emotions (pleasure, fear, rage, aggression)

What hormonal functions does the hypothalamus perform?

• Produces ADH, oxytocin, and releasing/inhibiting hormones

Where is the epithalamus located?

• Part of the diencephalon; contains the pineal gland

What is the main function of the epithalamus?

• Produces melatonin to regulate sleep

Where is the pineal gland located?

• Within the epithalamus

What does the pineal gland do?

• Produces melatonin to induce sleep

Where is the limbic system located?

• Includes specific areas of the cerebrum (e.g., prefrontal cortex, hippocampus) and diencephalon (e.g., hypothalamus)

What is the main function of the limbic system?

• Establishes and controls emotions

What additional function does the limbic system perform?

• Involved in the formation of long‑term memories

Where is the hippocampus located?

• Part of the limbic system within the temporal lobe

What is the main function of the hippocampus?

• Converts short‑term memories into long‑term memories

Where is the hypothalamus located (in relation to the limbic system)?

• Part of the diencephalon contributing to limbic emotional responses

What is the role of the hypothalamus in the limbic system?

• Initiates physical responses to emotions (e.g., ↑ HR, sweating, fear, rage)