Brain. Meninges, ventricles, cerebrospinal fluid & blood supply Hindbrain and midbrain Forebrain Limbic system. Brain Description. Brain weighs 3 to 3.5 pounds Major portions -- brainstem, cerebrum, and cerebellum cerebrum is 83% of brain volume
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Longitudinal fissure separates 2 cerebral hemispheres.
In fish, amphibians, and reptiles monitors day and season length
Endocrine function in mammals, secreting melatonin
Seasonal sexual cycles
Humans - circadian
Association areas interpret information
Somatosensory area is postcentral gyrus
Ditto for Motor Homunculus