This pea-sized master gland of the endocrine system directs chemical changes that regulate the entire organic system.

 -> Pituitary Gland; This part of the brain links the endocrine system to the nervous system via the pituitary gland. It controls body temperature, hunger, thirst, fatigue, anger, and circadian cycles.

 -> Hypothalamus; This structure is a part of the forebrain, located in the medial temporal lobe. It belongs to the limbic system and plays major roles in short term memory and spatial navigation.
 -> Hippocampus; This is an egg-shaped structure that acts as a relay station, passing sensory and motor information from the spinal cord to the cortex. It is also fundamental in sleep and arousal states. It is the beginning of the brain’s formation at 5 weeks in utero.

 -> Thalamus