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The thalamus and hypothalamus.
The midbrain is one the upper part of the brain stem
The hypothalamus is below the thalamus.
The two parts are the thalamus and the hypothalamus. The hypothalamus is beneath the thalamus, so the answer to your question is the hypothalamus.
The thalamus helps the hypothalamus. The job of the thalamus is somewhat like a switchboard.
There are three main regions of the brain: the forebrain, the midbrain, and the hindbrain. The forebrain is broken down into the cerebrum, thalamus, hypothalamus, and pineal glands. The midbrain is subdivided into the tectum and the cerebral peduncies. And the hindbrain includes the brainstem, and the cerebellum.
The cerebral aqueduct connects the third and fourth ventricles in the brain.
The hypothalamus is in control of homeostasis and the process of negative feedback (for example: blood solute level and body temperature). This is in contrast to the thalamus which is a sort of relay organ of the brain designed to transmit the sensory electrical pulse onto the more specialised organ (e.g. retina (eye) --> optic nerve --> thalamus --> primary visual cortex --> visual association cortex). It is slightly large and positioned above of the hypothalamus.
The brain stem does not have three parts. The brain has three parts that include the brain stem. The other two parts are the cerebrum and the cerebellum.