Myelin

non-cancerous (benign). It is generally caused by abnormal and uncontrolled cell division, normally either in the brain itself (neurons, glial cells (astrocytes, oligodendrocytes, ependymal cells), lymphatic blood vessels), in the cranial nerves (myelin-producing Schwann cells), in the brain envelopes (meninges), skull, pituitary and pineal gland, or spread from cancers primarily located in other organs (metastatic tumors). Brain tumors are of two types: primary and secondary. Primary brain…

spinal nerves. Nerves — that are created of special cells referred to as neurons. Neurons are comprised of a nerve fibre, a cell body and an axone. Impulses travel to the nerve fibre into the cell body so onto the axone. A special sheath referred to as myelin, that will increase the the conductivity of the neuron, covers some…

is a live weakened virus that normally causes no symptoms or only very mild ones. However, wild-type measles can infect the central nervous system and even cause post infectious encephalomyelitis, probably because of an immune-mediated response to myelin proteins. A population-based study of measles, mumps, and rubella vaccination and autism was conducted by the Massachusetts Medical Society asks the question: Is there a relation between MMR vaccinations and autism? The question could be…

The human nervous system is our electrical wiring of the body that transmits signals between different parts of the body. It has two components; the central nervous system and the peripheral nervous system. The nervous system is an intricate part of your body and life that 's made up of two separate systems, the brain, and spinal cord. During prenatal growth, the nervous system experiences many changes to gain its compound structure. The events of this early development include the…

1. Discuss what a neuron is and the functions of its basic parts (dendrites, soma, axon, myelin sheath). A neuron is a nerve cell. There are about 10,000 specific types of neurons, but there are three most common neurons: sensory, motor, and interneurons. A sensory neuron sends signals to help your brain understand what is going on around you in your environment. Sensory neurons are what make up your senses, (smell, touch, see, taste, and hear.)…

1. Distinguish between afferent and efferent nerves. Afferent nerves are the sensory nerves. They carry information from the world to the brain and spinal cord. Efferent nerves are the motor nerves they carry information out of the brain and spinal cord to other parts of the body. Afferent nerves take in information and efferent nerves carry out information. 2. Study Figure 2.1. What makes up the Central Nervous System (CNS)? The central nervous system is made up of the brain and…

The lab for this week was a rather intriguing, which was appropriate for the very first lab of the semester. What a great way to start off too! Our take home lab tied in nicely with Monday’s lesson on drugs and their impairments on the brain. While I had enjoyed the comedic presentation on such a serious topic – complete with hilarious commentary over disconcerting visuals – it was nice to sit back and skim of the surface of the vast capabilities of the human brain. Admittedly, the information…

The structure of the brain is constantly changing from birth throughout the lifetime. It states that as our brain ages we start to lose our memory, retrieve new information etc. Also, people usually who are above age sixty an experience in cognitive decline, for example: weaken memory loss, decision making, social skills, remembering, paying attention, problem solving, and unclear thoughts. The experience of cognitive and memory loss as aging affects our daily routine and can impact out…

Guillain–Barré syndrome Guillain-Barre, pronounced: gee-YAH-buh-RAY, syndrome is a rare disorder in which your body's immune system attacks your peripheral nerves instead of invading organisms. I chose this topic because my father suffered for over 7 years with this debilitating disease. I have only known one person to have it, him. I have heard of it because it is one of the questions on the Influenza administration questionnaire form. I feel it is a unique and often misdiagnosed disease.…

The brain and body are more alike than people think. The brain sends signals to the body to do things. Stress is a state of mental or emotional strain or tension resulting from very demanding circumstances. When the brain senses danger, right away, it sends nerve signals down to the spinal cord to the adrenal glands. This tells them to release the hormone called adrenaline. Once this adrenaline is released, it raises a person's blood pressure and increases your heart rate. The hypothalamus…