telencephalon In the most primitive living vertebrates, the hagfishes and lampreys, the cerebrum is a relatively simple structure receiving nerve impulses from the olfactory bulb. endbrain MAT:0000421 Wikipedia:Telencephalon In the amniotes, the cerebrum becomes increasingly large and complex. In reptiles, the paleopallium is much larger than in amphibians, and its growth has pushed the basal nuclei into the central regions of the cerebrum. BAMS:CB BIRNLEX:1115 HBA:4007 EMAPA:16910 cerebral BAMS:CH uberon EV:0100165 supratentorial region MESH:D013687 telenencephalic The cerebrum of birds has evolved along different lines to that of mammals, although they are similarly enlarged, by comparison with reptiles. However, this enlargement is largely due to the basal ganglia, with the other areas remaining relatively primitive in structure. MA:0000183 BTO:0000239 CALOHA:TS-1018 EFO:0000912 BM:Tel VHOG:0000283 Part of the forebrain consisting of paired olfactory bulbs and cerebral hemispheres.[AAO] In ray-finned fishes and most pronounced in teleosts the roof plate of the embryonic telencephalon extends laterally with the effect that the paired alar plates forming the hemispheric walls roll out lateroventrally in a process called eversion. This is unlike the development in other vertebrate groups. [ZFA:0000079, ISBN:3764351209] neuronames:31 DHBA:10158 MIAA:0000421 TAO:0000079 cerebrum In ray-finned fishes the inner surfaces of the lateral and ventral regions of the cerebrum bulge up into the ventricles. FMA:62000 PBA:128011350 telencephalic The anterior and dorsal forebrain neuromere, includes the olfactory bulb. Kimmel et al, 1995.[TAO] XAO:0000012 Organ component of neuraxis that has as its parts the cerebral cortex, cerebral white matter, basal ganglia, septum and fornix, as well as subcortical gray and white matter structures[FMA:62000]. BAMS:IV UBERON:0001893 UMLS:C0039452 MBA:567 relationship loss: develops_from presumptive telencephalon (TAO:0000571)[TAO] GAID:621 SCTID:263353005 ZFA:0000079 In mammals the cortex covers almost the whole of the cerebral hemispheres. EHDAA2:0001982 AAO:0010479 Part of the forebrain consisting of paired olfactory bulbs and cerebral hemispheres. BAMS:Tel From an evolutionary standpoint, the telencephalon is the most recent brain structure: the amphioxus does not have this structure as a morphological entity. Overt telencephalon is present in the hagfish and lamprey to receive numerous input fibers from various parts of the CNS, similar to gnathostomes.[well established][VHOG] dolphins are the only species (other than humans) to have cerebra accounting for as much as 2 percent of their body weight. cerebellum regional part of brain