Nerve tissue transports messages throughout the body. It is composed of two types of nerve cells: neurons and glial cells. Neurons are the functional units of the nervous system, while the glial cells help the neurons function correctly.
A:Stephen Hawking was diagnosed with amyotrophic lateral sclerosis, or Lou Gehrig's Disease, in 1963. Doctors told Hawking that he would live only two more years as a result of this motor neuron disease, but he is still alive as of August 2014.
A:According to chronic pain specialist Dr. Blair Lamb, the sensation of legs or arms falling asleep is usually the result of nerve entrapment or neuropathy. While the condition is often no cause for concern, it can also indicate a stroke, multiple sclerosis, hyperventilation, anxiety, vitamin deficiencies or anemia. Ultimately, many different conditions can combine to cause paresthesia, or the feeling of “pins and needles” associated with a limb falling asleep.
A:The dendrites, or "tentacles," of a neuron pick up an electrical nerve impulse and conduct it toward the soma, or cell body. The nerve impulse travels through the soma and is then conducted down a threadlike fiber called the axon. At the end of the axon, the impulse travels over a gap called a synapse to reach the dendrites of the next cell.
A:The deltoid muscle is innervated by the axillary nerve. The deltoid is a triangular muscle located at the uppermost part of the arm and gives the shoulder its rounded contour. The axillary nerve extends from the brachial plexus, carrying nerve impulses to the deltoid muscle.
A:The New York University Langone Medical Center explains that brain cells begin to die after about four minutes without oxygen. Brain damage caused from a lack of oxygen is called anoxic damage, while hypoxia describes a low-oxygen condition. In other words, someone suffering from a lack of oxygen is said to be hypoxic, but any damage sustained is anoxic damage.
A:The abducens nerve is the sixth cranial nerve. Its main function is to control the lateral rectus muscle of both eyes. By innervating the lateral rectus muscle, the abducens nerve helps move the pupil of the eye, according to Healthline.
A:According to the BBC, the function of nerve cells is to transmit electrical messages and signals throughout the body. There are three types of nerve cells. Sensory neurons collect and transmit information about stimuli, such as sound, light and temperature. Motor neurons transmit electrical impulses from the brain to the rest of the body and are connected to sensory neurons by specialized cells called association neurons.
A:The main job of the nervous system is to send and receive messages throughout the body, explains the Monroe County Women���s Disability Network. It is responsible for controlling and coordinating body functions.
A:A nerve doctor is called a neurologist. A neurologist who specializes in surgical care of nerve-related injuries is called a neurosurgeon. Neurology is a branch of medicine that studies the nerves, brain, nervous system and spine, according to the Johns Hopkins Medicine Health Library.
A:According to the University of Washington, the nervous systems works with other body systems by sending commands to the other systems and receiving information back from them. Additionally, some of the body’s systems and structures, such as the vertebrae and skull, help to protect the central nervous system.
A:According to Neurogenetics at the University of Tennessee Health Science Center, the human body has 95 to 100 billion neurons or nerve cells. The brain alone has at least 85 billion of these cells, although estimates go as high as 1 trillion.
A:The BBC describes a reflex arc as the nerve pathway through which neural impulses travel to cause a quick autonomic response known as a reflex. Reflexes are not something people think about, rather, they are impulsive reactions to stimuli.
A:Albert Einstein's brain was cut into 240 pieces after his death in 1955, and scientists determined that the physicist's parietal lobe was 15 percent larger than normal, and that part of his brain was missing the Sylvian fissure. The parietal lobe deals with spatial, mathematical and three-dimensional abilities. A missing Sylvian fissure allows brain cells to communicate faster in the parietal lobe.
A:The human brain continues developing until a person is around 25, according to the NPR website. An 18-year-old person is only halfway through the process of brain development and change that begins with puberty.
A:Approximately 73 percent of the average human brain is composed of water. The heart is also composed of 73 percent water, while the lungs are 83 percent water. The average human adult body is made up of 60 percent water.
A:The central nervous system, composed of the brain, spinal cord and an extensive neuron network, serves as the control center for all bodily functions. It functions as the transmitter and receiver as well as the pathway for information flow and determines how the body responds to changes in its internal and external environment.
A:The main functions of the cervical spine are to support the skull, provide mobility for the spine and protect the spinal cord, according to Healthline. The cervical spine is located at the upper portion of the spinal column.