
Cerebrum: The largest part of the brain, accounting for about 85% of its weight, measures approximately 15–17 cm in length in adults.
Cerebellum: Located below the cerebrum, it is smaller, weighing about 150 g, and is around 10 cm wide.
Brainstem: A smaller structure measuring about 7.5 cm in length, it connects the brain to the spinal cord.
Thalamus: Roughly the size of a walnut, it serves as the relay center for sensory and motor signals.
Pituitary Gland: A pea-sized structure critical for hormone regulation, measuring around 1 cm in diameter.