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Type:
Educational Exhibit
Keywords:
Anatomy, Neuroradiology brain, MR, Computer Applications-Detection, diagnosis, Biological effects, Outcomes
Authors:
A. R. SIVAJI; TBILISI/GE
DOI:
10.1594/ecr2017/C-1914
Background
Efferent connections :
Autonomic & locomotor control centres of brainstem & spinal cord
Cranial nerve nuclei- dorsal nucleus of vagus
Cerebral cortex indirectly through diencephalic nuclei
Red nucleus,
substantia nigra, tectum of midbrain
Functional Divisions of Reticular activating system:
1.Ascending reticular activating system(ARAS)commonly termed as reticular activating system (RAS).It is believed to be responsible for maintaining a state of alertness & consciousness
2.
Descending reticular system(DRS) consists of descending pathways to brainstem,lateral & anterior horn cells in the spinal cord.
Functions of Reticular formation
· Maintains the normal state of consciousness or wakefulness through its connections with cerebral cortex by ARAS
· Regulates respiration,heart rate blood pressure
· Controls muscular activity throughreticulospinal projections to LMN &indirectly by influencing the activities of cerebellum,
red nucleus,
substantia nigra,
corpus striatum & cerebral cortex
· Controls receptivity of sensory end organs
· Controls threshold of central sensory pathways
· Regulates endocrine,
visceral & emotional functions through its connections with hypothalamus & limbic lobe