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S: The Nervous System

FC: The Nervous System By:Desiree M.,Sade L., Danesha R.,Jonniemae M.

1: The neurons are nerve cells. They are made up by a cell body and connecting fibers. It's there job to carry messages throughout the body. Without nerves and neurons we would'nt be able to function. There are many different parts of a neuron. the nucleus and the cytoplasm make up the cell body which is like a control center of a neuron. The cell body makes sure the neurons system is running smoothly. Sticking out from the cell body are dendrites and axon. Dendrites are fibers that gives messages to the cell body. The axon is a long fiber that carries messages away from the body. | The Neuron

2: The Neuron (cont.) | if an axon gets damaged or something. Some neurons also have something thats called neurilemma .(helps the axon grow) There is a space between each nerve cell which is called a synapse. (makes sure the messages being sent to the body are going one way) Protoplasm is the living matter of all cells. The matter of cells divide into 2 groups. 1st is the white matter which is distinguished because it has a myelin sheath or covering whereas. 2nd is gray matter its the other type of matter it dose'nt have a myelin sheath.

3: Sensory Neurons Sensory neurons carry messages from the senses(taste, touch, smell, sight, hearing) to the brain and spinal cord. | Motor Neurons Motor neurons carry messages from the brain and spinal cord to muscles and glands of the body. | Interneuron Interneurons are neuron located entirely within the central nervous system that conducts signals between neurons. | The Three Types Of Neurons

4: Sensory neurons carry messages to the spinal cord. Then an association neuron carries it to a motor neuron then causes the muscle to jerk | The Reflex The reflex is something you do not have to learn to do it is a natural reaction. Reflexes are so fast,your muscles move before you brain can even process. It is a protective mechanism.

5: The Central Nervous System The central nervous system is made of the brain and spinal cord. Both the brain and spinal cord are protected by bone. The body has so many protective mechanisms because trauma to the brain or spinal cord can

6: The Central Nervous System cause extreme disabilities of death. Injury to the brain can result in loss of speech, the ability to think, the ability to feed yourself and etc. Injurys to the spinal cord can cause a person to become paralyzed. The brain has different sections for different tasks. the top of the brain is called the cerebrum,the middle section of the brain is called the cerebellm, the final part of the brain is called mendulla oblongata at the bottom of the brain which controls all the bodies vitals like the heart beat, and it connects to the spinal cord.

7: The Cerebrum The cerebrum is the largest part of the brain. The surface area of the cerebrum is called the cortex. The cortex is folded in ridges called convolutions,and is like the control board. One large ridge,or fissure, divides the cerebrum into two hemispheres. The motor area of the cerebrum is about two inches wide and is located between the ears. Opposite sides of the cerebrum control the other sides of the body.

8: The Cerebrum Behind the motor area is the part of the brain that receives nerve messages for touch. The rear part of the brain is sight. the lower area of the brain is for speech, hearing, taste, and smell. The second layer of the cerebrum is called the cerebral medulla. The cerebrum medulla makes connections throughout the brain.

9: The Cerebellum, Medulla, and Spinal Cord | The cerebellum is divided into two hemispheres. It is in charge of balance and coordination. Injuries to the cerebellum can cause in jerking, unpredictable movements. | The medulla is made up of white matter on the outside and gray matter on the inside. The white matter receives messages from parts of the brain. The gray matter is like a switch board for sensory and motor messages. Some of the gray matter also controls the bodies vitals

10: The spinal Cord is a bundle of nerves attached to 31 pairs of nerves with messages. Some of the nerves carry messages to the brain while others send messages to the brain while others send messages to muscles and glands.

11: The Peripheral Nervous System | The peripheral nervous system connects the brain and the spinal cord to the rest of the body with 43 pairs of nerves. 12 pairs of nerves that connect to the brain and involve sight, balance, etc. they are called the cranial nerves. The other 32 pairs of nerves, called spinal nerves, connect to the spinal cord and extend to all areas of the body. The autonomic nervous system is made up of some cranial and spinal nerves. Autonomic nerves control digestion and other internal activities. There are two divisions of autonomic nerves.

12: The first division of the autonomic nervous system is the parasympathetic division. This division is in charge of slowing the heartbeat or respiration of the body. The second division is the sympathetic divsion,it speeds bodily functions up, like making a heartbeat or respiration faster. | The Peripheral Nervous System

13: THE END:)

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