Bear and bigcats anatomy

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Nervous system of grizzly bear,

Grizzly bears have a central nervous system with nerves and a spinal cord.
Parts of the brain:

(1) cerebral cortex
(2) thalamus
(3) midbrain
(4) pons and medulla 
(5) cerebellum
               
The structures referred to above as well as the hypothalamus and pituitary gland control the bear’s actions. These include avoidance, aggression, learning and memory, hibernative, and reproductive behaviors.
Source: http://daskellah.weebly.com/respiration-...stems.html

Grizzlies bears have a brain that is only about the size of a human's thumb and only weigh 450g compared to a human's brain which weigh about 1,500g but their brain's are very powerful despite their small brains. Grizzlies have an olfactory map in their brain that helps them go places based on the smells of everything around them unlike humans who get around places by seeing things. This means that a Grizzlies percentage their brain is devoted to scent 5 times greater than the percentage that is devoted to smell in human brains. To put in perspective how good a grizzlie's sense of smell is, a normal dog can smell 100 times greater than a human, a hound dog can smell 300 times better than a normal dog and a Grizzly Bear can smell 7 times better than even a hound dog and can smell things from huge distances away.
Source: https://sites.google.com/site/httpsgrizz...me/systems

I did not find much information on brain of grizzly bears. Can anyone help me in this? Reply