Which of the following is located inside the brainstem in between your ears?

A) hippocampus
B) hypothalamus
C) thalamus
D) reticular formation

The reticular formation is a network of neurons in the brainstem that plays a role in regulating arousal, attention, and sleep. It is located in the posterior region of the brainstem, which is in between the ears. The hippocampus is a structure located in the temporal lobes and is involved in memory formation. The hypothalamus is a structure located below the thalamus and is involved in regulating various bodily functions such as temperature, thirst, hunger, and hormonal release. The thalamus is a structure located above the brainstem and is involved in sensory processing and relaying information to the cerebral cortex.