Saturday, 6 December 2014

Learning Objective 5#

Explain one study related to localization of function in the brain

The brain is is part of the body and it's responsible for thinking recognition and feeling .Brain contains around 10 to 12 billion cells and each has fiber called Axon and Dendrite for providing Electrochemical run through each other . To think and remember things its all caused by the connection of electricity in the brain.




Parts of the human brain Can be divided into 3 parts.

1: Forebrain
The largest part of the brain ,there are a number of notches .And can be divided as follows:

    1.1: Olfactory bulb
In the front part of the brain use to smell(fish, frogs and lizards have this a big part Olfactory bulb)

    1.2: Cerebrum
Largest size and has a lot of notches .Controls on learning ability ,the main control center of muscles ,speech ,sight ,smell ,taste .
     1.3:Thalamus
Acts as the center of neurotransmitters that pass through then separate neurotransmitters to the brain that is related to them.
     1.4: Hypothalamus
Is at the bottom of the brain that connects with Pituitary Gland .Neurons of this part of brain produces nerves hormones which controls the hormones production from Pituitary Gland.

2: Midbrain
Is the part of the brain that connected with Forebrain ,works as a station transportation for neuron between Forebrain and Hidebrain also Forebrain and the eyes controls the movement of the eyeball and iris.

3: Hidebrain

     3.1: Pons
At the front of the Cerebellum. Adjacent to the midbrain to control some functions of the body such as chewing food. Salivation the movement of facial muscles, breathing, listening.
     3.2:Medulla
Is the final part of the brain to the spinal cord. It is the passage of nerve impulses between the brain and the spinal cord. Also is a central control over the mind, such as coughing, sneezing, breathing, heartbeat, etc. hiccup.
     3.3: Cerebellum
The area of the brain that functions in the processing of recognition and control of command. Also is the of the muscle that controls movement and balance. Allows precise movements such as walking, jogging, cycling.


Study 1: Phineas Gage (1848)
Phineas P. Gage was an American railroad construction foreman In the town of Cavendish Vermont state in September 13, 1848 He was doing and explosive things to build a railway .In the process to drop the explosion is to drill down to the rocks that emerge from the ground ,put in the explosion and fill with the sands and then they used a steel rod to press those components inside. On the day Gage forgot to fill the sand ,the steel rod ignited with the rock and got exploded .The steel rod was fired from the ground "Penetrated the left side of his cheek ... Through the back of the left eye and went out through the top of his head".

Everybody was sure that he was going to die but he surprised everyone including Doctor by sitting up and talk normally and getting better .But there was something strange about him which is his personality was totally changed to another person ,he was once a honest trust able and diligent person but after the accident everything like that was gone .He became irresponsible boorish and use abusive words .Eventually he got fired from his job and ended up joining the circus show with Barnum and Bailey.

After he died, and he contributed the skull for medical research. At that time, his case has been studied a lot and it has changed the way scientists view the brain. In this case, it is believed to be the first proof that each part of the brain responsible in different tasks. During the early 1990's the biologists from University of Iowa used the graphic from computer and  visualization techniques to study the way that steel rod penetrates Gage's skull . Both of them confirmed that the rod had destroyed the middle of the bottom part of Frontal lobe which controls about human's emotions but did not damage the part that controls speech and movements. 

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