Axon

INVESTIGATION OF THE SPEED OF A NERVE IMPULSE INTRODUCTION The speed of a nerve impulse is an important aspect of the human nervous system and can be altered by different stimulants. In 1850, Hermann von Helmholtz succeeded in measuring the speed of the nerve impulse. He found it to be much slower than the previously believed speed of 50 to 100 meters per second. This finding was then followed by intensive investigation of the nervous system within the framework of the physical and biological sciences

inflammatory destruction.” 4 On the borders of chronic active plaque, there are active microglia and macrophages along with reactive astrocytes. Remyelination is not common and oligodendrocytes are completely lost with a reduction in the density of the axon. Multiple sclerosis can be a very serious disease that can have tremendous deficits on the individual affected. Symptoms can range from mild to severe and many steps have to be taken to make sure patients with this disease can cope with it. The diagnosis

stimuli to the spinal cord. Interestingly, many of these neurons are psuedounipolar (2). They have two axons and a central cell body. The central bodies of these neurons are concentrated in the dorsal root ganglion, which is located in the dorsal root of a spinal nerve. This nodule allows for organization of the neurons, particularly the axons, which join to form neural fibers. The peripheral axons extend away the cell body and end where stimuli will be received. This is where the receptors are located

basic parts: the cell body, dendrites, and axon. Neurons transmit signals to other nerve cells and throughout the body. They are simple components in the nervous system. The cell body includes the nucleus, which is the control center of the neuron. The dendrite branches off the cell body and receives information. The axon is attached to the cell body and sends information away from the cell body to other cells. When the axon goes through myelination, the axon part of the neuron becomes covered and insulated

Question 1: Electron communication is a lot like sending messages through today’s technology. When a neuron is stimulated, it sends an impulse from dendrites down its axon. The impulse is the same in that it fires at one strength and speed, the only difference is in the number of impulses sent. The impulse that is sent is what we call the action potential. A weak stimulus will trigger less frequent action potentials, while a intense stimulus will increase the frequency of action potentials. The

up of the brain, spinal cord and optic nerves. Our bodies are made up of neurons that have cell bodies and axons, they help us with speaking, thinking and every other thing our body does. "Myelin" National Multiple Sclerosis Society. N.p., n.d. Web. 20 Feb. 2017.. says, “Each neuron is made up of a cell body and an axon (the extension of the cell body that carries messages). Most of the axons in the central nervous system are wrapped in myelin, a substance rich in lipids (fatty substances) and proteins

6. This results in the loss of current stability across the nerve, which in turn provides a far less reliable message. Severing of the nerve (axon) can result in numbness or complete paralysis. [Transition: Now that you have a basic intuition of Multiple Sclerosis, lets start by understanding what’s causing it.] B. Causes of Multiple Sclerosis 1. Environmental factors such as trace

had been cut cross-sectionally you would be able to see a butterfly-shaped region, which would appear grey in colour and surrounded by white matter. Found on the outside of the cord, the white matter consist of bundles of nerve fibres called axons. The axons extend the length of the spinal cord supporting communication of the CNS. Each bundle of nerve fibres are responsible for specific types of information they can transmit ascending signals towards the brain and descending signals from the brain

Localization) for Axon Outgrowth Patterning Normally, at the leading edge, the molecular mechanism produces axon outgrowth activity and moves plasma membrane extension of HSN cell body in the ventral direction (Adler et al., 2006). However, in mutants, the different directions of axon outgrowth from the HSN cell body scored to create a probability distribution for axon outgrowth activity directions, diffusion and displacement (Tang and Wadsworth, 2014). Therefore, the axon outgrowth pattering

and performing simple tasks such as buttoning her shirts. She then decided to visit her physician. The Biological aspects: The main functions of the myelin sheaths are to insulate the axon as well as increase the speed at which action potentials are propagated between successive nodes of Ranvier, of the axon. The Nodes of Ranvier contain voltage-gated channels that assist in boosting