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The Human Nervous System
Transcript of The Human Nervous System
Michael’s Nervous System presentation from Gr.4
My father Fun Facts A newborn baby sees the world upside down because it's brain didn’t learn to change the image right-side up yet.
If we lined up all the neurons in our body it would be almost 1000 km long.
The left side of the brain controls the right side of the body and the right side of the brain controls the left side of the body.
There are more neurons in the human brain then the stars in the Milky Way.
There is 70 km of nerves in your body. Your brain tells you what to do and how to react. Your brain has neurons that learn more every time after communicating with each other. Different parts of your brain stores different knowledge and controls different parts of your body. There are eight main lobes of your brain, a cerebellum and a brain stem. Your brain is mainly made of water, fat and protein. It is protected by a bony skull. About the Brain The Eight Main Lobes, the Cerebellum & the Brain Stem The eight main lobes of your brain are called the frontal lobes, parietal lobes, occipital lobes and the temporal lobes. Because the right and left sides of your brain are separated, there are two lobes for each name. Each lobe of your brain contribute in a lot of functions, so I will just tell you the main functions. I will also talk about the Cerebellum and the Brain Stem.
Frontal Lobes: Located behind your forehead, they are responsible for functions such as emotions, reasoning, judgment, problem solving, and planning. They also play a role in memory.
Parietal Lobes: Located behind the Frontal Lobes at the top back of your head, they control sensation and taste. Sensation includes pain, pressure, hot or cold, etc. They also play a role in language.
Temporal Lobes: Found under the Parietal and the Frontal Lobes, about the level around the ears at the side of the brain, they are responsible for hearing such as recognizing parts of speech and certain sounds. They also contribute in memory and emotion.
Occipital Lobes: Located at the back of your head, they are responsible for vision and recognizing objects.
Cerebellum: Located under the Temporal and Occipital Lobes, it is responsible for coordination, balance and movement.
Brain Stem: Located under the Temporal Lobes it is responsible for basic involuntary functions that include breathing, beating of the heart, blood pressure and sneezing. The five senses include sensory, vision, hearing, smell and taste. When sensory happens, nerve endings in your skin can tell you what and how you feel. Your body has about twenty different types of nerve endings that all feel different types of feelings, like hot, cold, pain, etc. Vision is actually just light rays bouncing of objects into your eyes. There are two special types of cells in your eyes that receive the image and sends it to the brain. However, when the image is sent to the brain it is up-side down! It is the brain's job to turn it right-side up. What you hear is actually sound waves traveling through the air. It goes into your ear and hits your eardrum that causes vibrations that move your cilia. Your cilia then turns the vibrations into messages that are sent to your brain. What you smell are odor particles. They are so small that you can't even see them with a microscope. Each odor particle fits into a neuron and a message of what your smelling is sent to your brain. You taste what you eat with taste buds. The neurons in your taste buds send messages to your brain of what your tasting. The Cells There are two types of tiny cells called neurons and glial cells throughout the Nervous System. There are more than a 100 billion neurons in your Nervous System and about 10 times more glial cells! The jobs of neurons are to send messages to your brain. Every neuron consists of a cell body, an axon, and a dendrite. Dendrites are little tentacles that receive messages from other neurons. The Axon is where the neuron sends messages. The cell body is where the nutrients for the cell is produced and where the Nucleus belongs. Neurons throughout your Nervous System die every day and can't reproduce in most areas but there are enough for your lifetime. Neurons are also fed by glial cells that attach themselves to neurons and feed them. Glial Cells can also reproduce. Neurons pass messages on until it reaches your brain, then your brain decides what to do and sends a message back. Those neurons are connected through nerves, where large amounts of neurons are linked together. Almost all those nerves connect to the spinal cord, the cord running down your back that is connected to your brain. Neurons in the spinal cord are also responsible for reflexes. A reflex occurs when you have to do something quick like after you touched something hot it only goes to your spinal cord because you need to react fast. How the System Works