Human Brain (The introduction)

Human Brain (The introduction) 

Human Brain is located in the Cranial cavity.

             Cranial bones protects it from injury. It weighs 1200-1400 grams. Number of nureons 100 billions. It forms 98% of whole CNS. Study of brain is called Encephalogy. 

Brain is classified into three parts-:

1. Fore brainb(PROSENCEPHALON) -: It           consists of  DIENCEPHALON and TELENCEPHALON it give rise to Thalamus, Hypothalamus  and  cerebral ncortex, corpus stratum amygdala, hippocampus

2. Mid brain :- derived from                                  (MESENCEPHALON) 

3. Hind brain :- (RHOMBENCEPHALON) it consist of MYLENCEPHALON and MESENCEPHALON they give rise to Medula and phones, cerebellum respectively. 

                     Human Brain consists of 3 coats :-    

         1. Dura matar- Thick, tough fibrous tissue 

        2. Arachoind- Thin deelicate connective tissue,  non vascular 

           3. Pia matar:-  Thin, highly vascular and npifgmented. 

Cerebral  spinal fluid is present in Sub archanoid space (CSF). 

   Brain stem which is formed by the composition of Medulla + Pons + Midbrain + Dien Cephalon. It is covered by the cerebrum and cerebellum. Lymph like extracellular fluid secreted by choroid plexuses by filtration of blood which acts as a shock absorber and nourishes brain tissue.

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