In the substance of the formatio reticularis are two small nuclei of gray matter. The one near the dorsal aspect of the hilus of the inferior olivary nucleus is called the<unk>  (inferior central nucleus, nucleus of Roller.)
Sublingual nucleus
Reticulotegmental nucleus
Ventral lateral nucleus
Paramedian reticular nucleus
Gigantocellular reticular nucleus
Lentiform nucleus
Periventricular nucleus
Arcuate nucleus 