Parkinson's Disease and the Human Nervous System
This essay examines the anatomy and function of the healthy human central nervous system before analyzing how Parkinson's disease disrupts those processes. It covers the brain's major divisions, the role of the spinal cord, and the function of neurons as the basic building blocks of the nervous system. The essay then explains how Parkinson's disease destroys dopamine-producing neurons in the substantia nigra, leading to progressive loss of motor function. Epidemiological data on prevalence and mortality are also discussed, providing context for the disease's significance as a public health concern.
- Introduction: Purpose and scope of the essay
- Components of a Healthy Nervous System: Brain, spinal cord, neurons, and ventricles
- Parkinson's Disease: Overview and Prevalence: Statistics, dopamine loss, and disease progression
- Neurological Mechanisms of Parkinson's Disease: Substantia nigra, neurodegeneration, and motor symptoms
- Conclusion: Ongoing research and outlook for patients
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What makes this paper effective
- Uses a compare-and-contrast structure that grounds the discussion of disease in a prior explanation of healthy anatomy, giving readers a useful baseline for understanding what goes wrong.
- Incorporates concrete epidemiological data (e.g., 50,000–60,000 new U.S. cases per year, the 60–80% dopamine-cell loss threshold) to support claims and add credibility.
- Employs accessible analogies—comparing the brain to a computer processor and the spinal cord to bundled cables—to make complex neuroanatomy approachable for a general audience.
Key academic technique demonstrated
The paper demonstrates foundational expository writing by establishing normal function before describing pathology. This technique, common in health science writing, helps readers understand disease as a deviation from a defined baseline rather than as an isolated phenomenon, strengthening the overall explanatory argument.
Structure breakdown
The essay opens with a brief introduction stating its purpose. The first body section systematically reviews healthy CNS anatomy: the brain's three divisions, the ventricles and cerebrospinal fluid, the spinal cord, and neurons. The second body section shifts to Parkinson's disease, covering prevalence statistics, the role of dopamine, the substantia nigra, and the process of neurodegeneration. The paper concludes implicitly within the disease section, noting the progressive nature of the condition and ongoing research efforts.
Introduction
The human central nervous system is a remarkably designed component of the body that enables us to perform the most essential tasks required for survival. It is therefore very important to investigate and understand how this system functions and operates, including how disease and malfunction affect it. The purpose of this essay is to describe the normal anatomical qualities of the human nervous system. To do this, the effects of Parkinson's disease, a disorder of the nervous system, will be analyzed to help contextualize the health of a well-regulated nervous system against one that is not working properly.
Components of a Healthy Nervous System
The central nervous system is the command and control center for the nervous system. This physiological component receives information from and sends information to the peripheral nervous system. The two main organs of the central nervous system are the brain and the spinal cord. The brain processes and interprets sensory information sent from the spinal cord, much like the processor in a computer. The brain and spinal cord are protected by three layers of connective tissue called the meninges.
Within the central nervous system is an organization of hollow cavities called ventricles. These linked cavities in the brain are continuous with the central canal of the spinal cord. The ventricles are filled with cerebrospinal fluid, which is produced by specialized epithelium located within the ventricles called the choroid plexus. This fluid protects the brain and spinal cord from damage while also assisting in the circulation of nutrients to the brain.
Although the brain may be divided and analyzed in many different ways, it consists mainly of three parts: the forebrain, the midbrain, and the hindbrain. The forebrain conducts much of the conscious thinking that occurs within the mind and produces language, thought, and motor function. The thalamus and hypothalamus are located in the forebrain, and most information is processed in the cerebral cortex, also located in the forebrain. The midbrain acts as a bridge between the forebrain and the hindbrain, while the hindbrain helps the person maintain balance and perception.
The spinal cord must also function properly as part of a healthy central nervous system. The spinal cord is a bundle of nerves that runs down through the middle of the spinal column, much like computer cables. These nerves act as wires, transmitting and receiving signals in the body using electrical impulses called stimuli. Ascending nerves carry information from the body to the brain, while descending nerves work in the opposite direction.
Neurons are the basic building blocks of the central nervous system, and every organ within this system is composed of them. In a healthy nervous system, neurons are able to transfer electrical energy to each location of the nerve endings, producing sensory stimuli in the human mind. Neurons are classified as motor neurons, sensory neurons, or interneurons.
Parkinson's Disease: Overview and Prevalence
Parkinson's disease is a significant ailment in today's society. In the United States, 50,000–60,000 new cases of Parkinson's disease are diagnosed each year, adding to the one million people who currently live with this illness. The Centers for Disease Control has identified complications from Parkinson's disease as the 14th leading cause of death in the United States. Worldwide, it is estimated that four to six million people suffer from the condition. There is hope, however, as scientists work toward a cure and make progress in identifying the best treatment options for patients.
Parkinson's disease most often develops later in life, after the age of 50. It is one of the most common nervous system disorders of the elderly. While Parkinson's disease can affect younger adults, this is rare, and the disease can affect both men and women. In the brain, nerve cells use a chemical called dopamine to help control muscle movement. Parkinson's disease occurs when the nerve cells in the brain that produce dopamine are slowly destroyed. Without this chemical, the nerve cells in that part of the brain cannot properly send or receive messages, leading to the loss of muscle function. This condition may worsen as time progresses.
Conclusion
Parkinson's disease illustrates how the deterioration of a specific population of neurons — the dopamine-producing cells of the substantia nigra — can profoundly disrupt the motor functions coordinated by a healthy central nervous system. Understanding the normal anatomy and function of the brain, spinal cord, and neurons is essential for appreciating the extent of that disruption. There is hope, however, as scientists work toward a cure and make progress in identifying the best treatment options for patients with Parkinson's disease.
Works Cited
National Institute of Neurological Disorders and Stroke. "NINDS Parkinson's Disease Information Page." ninds.nih.gov.
National Parkinson Foundation. "Parkinson's Disease Overview." parkinson.org. Viewed 2 April 2013.
"Parkinson's Disease." The New York Times. Viewed 3 April 2013.
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