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.... TIIVI 24 September - neetguide : NEURAL CONTROL AND COORDINATION 21.4.1 Forebrain memory and commun function of cerebrum* dienceschlon -Righ cerebral hemu cerebral scompus callosum cortex (bass) athchi - mylnatio culus sensory 321 The forebrain consists of cerebrum, thalamus and hypothalamus (Figure 21.4). Cerebrum forms the major part of the human brain. A deep repithalamus Helt crebral wimbio system here cleft divides the cerebrum longitudinally into two halves, which are termed as the left and right cerebral hemispheres. The hemispheres are (144mall) connected by a tract of nerve fibres called corpus callosum. The layer of only in mammalian Brain cells which covers the cerebral hemisphere is called cerebral cortex and is thrown into prominent folds. Therefore cortex is referred to as the grey are Guysu and - becoz they have non- matter due to its greyish appearance. The neuron cell bodies are concentrated here giving the colour. The cerebral cortex contains motor mobom, ROH motor areas, sensory areas and large regions that are neither clearly sensory nor senious nor motor in function. These regions called as the association areas are responsible for complex functions like intersensory associations, memory associalion and communication. Fibres of the tracts are covered with the myelin sheath, white matter - myalin sheath which constitute the inner part of cerebral hemisphere. They give an den thalamus- sensory and opaque white appearance to the layer and, hence, is called the white matter. molow signalering The cerebrum wraps around a structure called thalamus, which is a major hypothalum- termoregulation coordinating centre for sensory and motor signaling. Another very important part of the brain called hypothalamus lies at the base of the sexual adivdy, dunking satily wnbre, os moregulation thalamus The hypothalamus contains a number of centres which control body temperature, urge for eating and drinking. It also contains several amygdala-anger and Hage groups of neurosecretory cells, which, secrete hormones called hippocampus - converts S.T.M. hypothalamic hormones. The inner parts of cerebral hemispheres and a group of associated deep structures like amygdala, hippocampus, etc. age to long term memory form a complex structure called the limbic lobe or limbic system. Along with the hypothalamus, it is involved in the regulation of sexual behaviour, expression of emotional reactions (e.g., excitement, pleasure, rage and emotional system, excitement and sexual behaviour. fear), and motivation. supruior calliculi w (conudinalion) eyes & head ...
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