EDUCATION (CBSE/UGC NET)

Detailed explanation-1: -The reticular activating system (RAS) is a network of neurons located in the brain stem that project anteriorly to the hypothalamus to mediate behavior, as well as both posteriorly to the thalamus and directly to the cortex for activation of awake, desynchronized cortical EEG patterns.

Detailed explanation-2: -The reticular formation may be best known for its role in promoting arousal and consciousness. This function is mediated by the reticular activating system (RAS), also known as the ascending arousal system.

Detailed explanation-3: -The reticular activating system (RAS) is composed of an ascending tract and a descending tract. The ascending RAS is responsible for human consciousness level and integrates the functions of the brain stem with cortical, cerebellar, thalamic, hypothalamic, and sensory receptor functions.

Detailed explanation-4: -Often called a “sensory clearing house, ” the thalamus regulates arousal, receiving and processing sensory inputs from brain regions important in senses like vision and hearing and relaying these inputs to the cortex.

Detailed explanation-5: -Collectively, the brainstem reticular formation is involved in regulation of muscle reflexes, coordination of autonomic functions, modulation of pain sensation, and behavioral arousal.