Related Research Articles
An axon or nerve fiber is a long, slender projection of a nerve cell, or neuron, in vertebrates, that typically conducts electrical impulses known as action potentials away from the nerve cell body. The function of the axon is to transmit information to different neurons, muscles, and glands. In certain sensory neurons, such as those for touch and warmth, the axons are called afferent nerve fibers and the electrical impulse travels along these from the periphery to the cell body and from the cell body to the spinal cord along another branch of the same axon. Axon dysfunction can be the cause of many inherited and acquired neurological disorders that affect both the peripheral and central neurons. Nerve fibers are classed into three types – group A nerve fibers, group B nerve fibers, and group C nerve fibers. Groups A and B are myelinated, and group C are unmyelinated. These groups include both sensory fibers and motor fibers. Another classification groups only the sensory fibers as Type I, Type II, Type III, and Type IV.
Myelin is a lipid-rich material that surrounds nerve cell axons to insulate them and increase the rate at which electrical impulses pass along the axon. The myelinated axon can be likened to an electrical wire with insulating material (myelin) around it. However, unlike the plastic covering on an electrical wire, myelin does not form a single long sheath over the entire length of the axon. Rather, myelin ensheaths the axon segmentally: in general, each axon is encased in multiple long sheaths with short gaps between, called nodes of Ranvier. At the nodes of Ranvier, which are approximately one thousandth of a mm in length, the axon's membrane is bare of myelin.
Within a nervous system, a neuron, neurone, or nerve cell is an electrically excitable cell that fires electric signals called action potentials across a neural network. Neurons communicate with other cells via synapses, which are specialized connections that commonly use minute amounts of chemical neurotransmitters to pass the electric signal from the presynaptic neuron to the target cell through the synaptic gap.
Schwann cells or neurolemmocytes are the principal glia of the peripheral nervous system (PNS). Glial cells function to support neurons and in the PNS, also include satellite cells, olfactory ensheathing cells, enteric glia and glia that reside at sensory nerve endings, such as the Pacinian corpuscle. The two types of Schwann cells are myelinating and nonmyelinating. Myelinating Schwann cells wrap around axons of motor and sensory neurons to form the myelin sheath. The Schwann cell promoter is present in the downstream region of the human dystrophin gene that gives shortened transcript that are again synthesized in a tissue-specific manner.
Nervous tissue, also called neural tissue, is the main tissue component of the nervous system. The nervous system regulates and controls body functions and activity. It consists of two parts: the central nervous system (CNS) comprising the brain and spinal cord, and the peripheral nervous system (PNS) comprising the branching peripheral nerves. It is composed of neurons, also known as nerve cells, which receive and transmit impulses, and neuroglia, also known as glial cells or glia, which assist the propagation of the nerve impulse as well as provide nutrients to the neurons.
The pyramidal tracts include both the corticobulbar tract and the corticospinal tract. These are aggregations of efferent nerve fibers from the upper motor neurons that travel from the cerebral cortex and terminate either in the brainstem (corticobulbar) or spinal cord (corticospinal) and are involved in the control of motor functions of the body.
Eliteserien is a Norwegian professional league for association football clubs. At the top of the Norwegian football league system, it is the country's primary football competition. Contested by 16 clubs, it operates on a system of promotion and relegation with the Norwegian First Division.
The dorsal column–medial lemniscus pathway (DCML) is a sensory pathway of the central nervous system that conveys sensations of fine touch, vibration, two-point discrimination, and proprioception from the skin and joints. It transmits information from the body to the primary somatosensory cortex in the postcentral gyrus of the parietal lobe of the brain. The pathway receives information from sensory receptors throughout the body, and carries this in nerve tracts in the white matter of the dorsal column of the spinal cord to the medulla, where it is continued in the medial lemniscus, on to the thalamus and relayed from there through the internal capsule and transmitted to the somatosensory cortex. The name dorsal-column medial lemniscus comes from the two structures that carry the sensory information: the dorsal columns of the spinal cord, and the medial lemniscus in the brainstem.
In medicine, a stinger, also called a burner or nerve pinch injury, is a neurological injury suffered by athletes, mostly in high-contact sports such as ice hockey, rugby, American football, and wrestling. The spine injury is characterized by a shooting or stinging pain that travels down one arm, followed by numbness and weakness in the parts of the arms, including the biceps, deltoid, and spinati muscles. Many athletes in contact sports have suffered stingers, but they are often unreported to medical professionals.
John Axon GC was an English train driver from Stockport who died while trying to stop a runaway freight train on a 1 in 58 gradient at Chapel-en-le-Frith in Derbyshire after a brake failure. The train consisted of an ex-LMS Stanier Class 8F 2-8-0 No. 48188 hauling 33 wagons and a brake van.
Nerve injury is an injury to a nerve. There is no single classification system that can describe all the many variations of nerve injuries. In 1941, Seddon introduced a classification of nerve injuries based on three main types of nerve fiber injury and whether there is continuity of the nerve. Usually, however, nerve injuries are classified in five stages, based on the extent of damage to both the nerve and the surrounding connective tissue, since supporting glial cells may be involved.
Rachel, meaning "ewe", is a feminine given name of Hebrew origin, popularized by the biblical figure Rachel, the wife of Israelite patriarch Jacob.
Rachael Pamela Sporn is an Australian former basketball player and three-time Olympian.
The spinal cord is a long, thin, tubular structure made up of nervous tissue that extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column (backbone) of vertebrate animals. The center of the spinal cord is hollow and contains a structure called the central canal, which contains cerebrospinal fluid. The spinal cord is also covered by meninges and enclosed by the neural arches. Together, the brain and spinal cord make up the central nervous system.
William Edward Armytage Axon was an English librarian, antiquary and journalist for the Manchester Guardian. He contributed to the Dictionary of National Biography under his initials W. E. A. A. He was also a notable vegetarianism activist.
Rachael Boyle is a Scottish international footballer who currently plays as midfielder for Hibernian in the Scottish Women's Premier League.
Axon is an English surname. Notable people with this surname include the following:
Christina Marie Burkenroad Sandoval is a professional footballer who plays as a forward for Liga MX Femenil club CF Monterrey. In January 2016, she was drafted by the Orlando Pride in the National Women's Soccer League. Born and raised in the United States to an American father and a Mexican mother, she plays for the Mexico women's national team.
Rachael Aladi Ayegba is a former Nigerian women's international footballer who played as a goalkeeper. At club level, she played for multiple Finnish clubs between 2005 and 2016. Ayegba is now a bus driver in London.
Rachael Killian is an Australian rules footballer who played for the Adelaide Football Club in the AFL Women's competition. She was drafted by Adelaide with their ninth selection and seventy-first overall in the 2016 AFL Women's draft. She made her debut in the twenty-five point win against the Western Bulldogs at VU Whitten Oval in round two of the 2017 season. She missed the round five match against Brisbane at Norwood Oval as a late withdrawal, before returning for the round six match against Melbourne at TIO Stadium. She was a part of Adelaide's premiership side after the club defeated Brisbane by six points at Metricon Stadium in the AFL Women's Grand Final. She played managed six matches in her debut season.
References
- ↑ Rachael Axon at the Norwegian Football Federation (in Norwegian)
- ↑ Rachael Axon at Soccerway
