CEREBRUM - forebrain

Cerebrum is the most developed and 2/3 part of the total brain

1.Cerebrum consist of two cerebral hemispheres. On the dorsal surface, a longitudinal groove deep clefti present between two cerebral hemispheres called as median fissure. Both the cerebral hemispheres are partially connected with each other by a curved thick band (tract) of nerve fibres called corpus callosum Largest commisure and specific character of mammalian brain) 

2.Each cerebral hemisphere is divided into 4 lobes-Anterior, middle, posterior and lateral.

Anterior lobe is also called frontal lobe largest lobe. Middle lobe is also called parietal lobe

3. Central sulcus separates frontal lobe from parietal lobe. Lateral lobe or temporal lobe is separated from frontal lobe and parietal lobe by incomplete sulcus called lateral sulcus Posterior lobe is abo called occipital lobe. It is separated from parietal lobe by a sulcus called parieto occipital sulcus

4. Many ridges and grooves are found on dorsal surface of cerebral hemisphere. Ridges are known as syri while grooves are called sulci. These cover the 2/3 part of carrebrum.

Gri and sulci are more developed in human being so human being are most intelligent living beings

5.The lasser of cells which covers the cerebral hemisphere is called cerebral cortex and is thrown into prominent folds. The cerebral.cottes is referred to as the grey matter due to its greyish appearance thick laser of grey matter is called nepalium/palm The neuron cell bodies are concentrated here giving the colour. The cerebral cortex contains motor areas, sensory areas and large regions that are neither clearly sensory nor motor in function. These regions called as the association areas are responsible for complex functions.liba Intienensory associations, memory and communication. Fibres of the tracts are covered with the relin sheath. which constitute the inner part of cerebral hemisphere. They she an opaqe white appearance to the layer and, hence, is called the white matter.

6.The inner parts of cerebral hemispheres and a group of associated deep structures like amygdala. hippocampus..etc.. forma 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 fear, and motivation. It also concern with collection and autonomic response.