AP PSYCHOLOGY

Detailed explanation-1: -The ARAS is part of the reticular formation, which consists of a network of neurons in the central portion or core of the brainstem from the medulla through the pons and midbrain and into the diencephalon.

Detailed explanation-2: -The reticular formation is found in the brainstem, at the center of an area of the brainstem known as the tegmentum.

Detailed explanation-3: -Most of the neurons that make up the midbrain reticular formation lie dorsal and lateral to the red nuclei. Collectively, the brainstem reticular formation is involved in regulation of muscle reflexes, coordination of autonomic functions, modulation of pain sensation, and behavioral arousal.

Detailed explanation-4: -The reticular formation is composed of a network of diffuse aggregations of neurons distributed throughout the central parts of the medulla, pons, and midbrain. It fills the spaces between cranial nerve nuclei and olivary bodies and intermixes between ascending and descending fiber tracts.