Question

write 5 to 6 pages about brain with efrrences

Answer 1

NERVOUS SYSTEM EVOLIVED FROM THE BLASTIC NON-POLARISES NERVE CELLS FOR FORMING A DIFFUSE OF NERVE NET AS SEEN IN THE DIPLOBLASTIC ORAGANISAM TO A HIGHKY ORAGANIZED INTEGRATING SYSTEM.WHITH THE THINK TANK THE BRAIN CONTAINING 100 BILLIONS OF NEURONS.CONTROLLING IT MAN HAS COME TO KNOW MORE ABOUT THE HEAD QUARTERS OF THE NERVOUS SYSTEM.WITH THE HELP OF FUNCTIONAL MAGNETIC RESONANCE IMAGING TECHNIQUE,A THREE DIMENSIONAL MAP OF BRAIN'S FUNCTIONING CAN BE OBTAINED WITH FMRI AND A COMPUTER.THESE STUDIES COULD PINPOINT THE VARIOUS PHYSIOLOGICAL REGIONS OF THE BRAIN AND CORRELATE THEM WITH SPECIFIC TASKS WE PERFORM IN OUR DAILY LIFE.

NEURONS TISSUES HAS CONNECTING CELLS CALLED NEURONS AND SUPPORTING CELLS CALLED GLIAL CELLS.THE SYSTEN MAINLY CONTROLS THE BODY ACTIVITES BY REACTING STIMULI.PROCESSING THEM.AND REACTING TO THEM BY SENDING MOTOR SIGNALS.AMONG THE VERTEBRATES THE NERVOUS SYSTEM REACHED THE PEAK OF EVOLUATION IN MAN ESPECIALLY WITH THE DEVELOPMENT OF THE NEOPALLIUM AND THE CORPOUS CALLOSUM.ALTHOUGH BOTH ARE STRUCTURALLY SIMILAR.FOR EXAMPLE MOST NEURONAL PROCESSING RELATED TO LANGUAGE IS PERFORMED IN THE LEFT HEMISPHERE OF THE RIGHT HANDED PEOPLE AND ABOUT 65%IN THE LEFT HANDED PEOPLE.HIPPOCAMPUS OF THE BRAIN IS RESPONSIBLE FOR THE FORMATION OF AND RECALL OF MEMORY AND SHORTTERM MEMORY.THE LIMBIC SYSTEM OF BRAIN FORMED BY HIPPOCAMPUS.RESEARCH WORK KI GOING ON WHY PEOPLE DEVELOP DEMENTIA,INVOLVING MEMORY LOSS AS SEEN IN ALZHEIMERS.HOWEVER HUMAN BRAIN REMAINS AN ULTRA COMPUTER.THE WORKING MECHANISAM OF WHOSE PROCESSOR HAS BOT YET BEEN DESLCIPHERED OR MAY BE IT CAN NEVER BE DECIPHERED AT ALL..

. HUMAN NERVOUS SYSTEM

It is divided into two parts.

The CNS(Central Nervous System)

The PNS(Peripheral Nervous System).

CNS:The CNS includes the brain and spinal cord.it develops from NEURECTODERM.brain is the LIVING SUPER COMPUTER.it is the site of information processing and control.it is protected in the cranial menings namely,DURA MATTER,ARACHNOID MATER and PIA MATER.Dura matter is the outer most,thick,double layers membrane which lines the inner surface of the cranial cavity.archnoid is middle membrane.it is separated by the duration matter by a narrow subdural space.pia mater is a thin,innermost meaning which closely adheres to the brain.pia mater is separated from the arachnid by the subarachnoid space.the brain can be divided into three major parts

i.FORE BRAIN

ii.MID BRAIN

iii.HIND BRAIN

FORE BRAIN:The fore brain consists of Olfactory bulb,Cerebrum and Diencephalon

OLFACTORY BULB:It receive impulses pertaining to smell from the olfactory epithelium.

CEREBRUM:ITis the major part of brain.cerbral cortex bad gyri and sulsi folds.cerbral cortex has three functional areas.sensory,motor and association areas respectively.

Diencephelon:it had 3 parts

*Epithalamus:non-nervous part.pineal body is present in this

*Thalamus:It lies superior to.mod brain.

It is main center for coordinating sensory and motor signaling

*Hypothalamus:It is thermostat of the body

MID BRAIN:

It mainly concerns on visual and auditory functions.

HIND BRAIN:

CEREBELLUM:it is little brain.

It is responsible for the control and coordination of locomotor activities.is is called the gyroscope of the body.

PANS VAROLI:Involved in the control of the respiratory muscles which is the function of pons.pons had the pneumotaxic centre.

MEDULLA OBLONGATA:VENTRICLES ARE THERE IN THIS.IN THIS FOURTH VENTRICLE CONNECTS TO THE SPINAL CORD.VENTRICLS AND SUBARACHNOID SPACE ARE FILLED WITH CEREBRO SPINAL FLUID.ITBIS ALKALINE AND COLOURLESS WHICH IS FILTERD FROM THE CHORONID PLEXURES INTO THE VENTRICLES OF THE BRAIN

CSF SERVES AS SHOCK ABSORBING MEDIUM.CSF IS RECYCLED 4 TIMES PER DAY IN ORDER TO.CLEAR OUT METABOLITIES AND TOXINS.