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Medanta Institute of

Dr. Ajaya N Jha
nstitute of Neurosciences

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1. Human brain, blood circulation and carotid artery: Introduction

The brain is the centre of the nervous system in all living beings. It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste and smell. The human brain is the most complex organ of the body. Human brain is estimated to contain 15-33 billion cells. These cells communicate with all the parts of the body.

Like human beings need food to survive and carry on their normal life, so do cells require blood and oxygen to provide them with nutrients to survive, multiply and grow. The circulatory system is an organ system that passes nutrients (such as amino acids, electrolytes and lymph), gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases, stabilize body temperature and pH etc.

Four major vessels (two internal carotid arteries in front and two Vertebral arteries in the back of the neck) supply blood to the brain. They arise from the arch of aorta which is a major vessel arising from the heart.

Have a figure which also shows Vertebral arteries


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