The is a network of nerves located in the brainstem. a. reticular formation b. cerebral cortex c. hypothalamus d. medulla

The correct answer is A. The reticular formation is a network of nerves located in the brainstem.

Explanation:

The reticular formation is a structure of the brainstem, from the rostral part of the annular protuberance to the caudal part of the diencephalon, which is responsible for circadian sleep / wake cycles. Phylogenetically it is one of the oldest parts of the brain. It is formed by neurons of different sizes and shapes scattered in the white matter. This system seems to intervene in the state of consciousness. Similarly, reticular formation modulates alertness and is composed of diffuse neuronal systems with different monoamines as neurotransmitters.

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