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Eighth cranial nerve
Eighth cranial nerve The eighth cranial nerve is the vestibulocochlear nerve. The vestibulocochlear nerve is responsible for the sense of hearing and it is also pertinent to balance, to the body position sense. Problems with the vestibulocochlear nerve may result in deafness, tinnitus (ringing or noise in the ears), dizziness, vertigo and vomiting. The 12 cranial nerves, the vestibulocochlear nerve included, emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column.
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Cranial
The anatomical term for towards the head; also the general term for of the head. i.e. the lungs are cranial to the pelvis. See Caudal/Inferior/Superior
Nerve
Tissue that conveys sensation, temperature, position information to the brain.
Balance
A biological system that enables us to know where our bodies are in the environment and to maintain a desired position. Normal balance depends on information from the inner ear, other senses (such as sight and touch) and muscle movement.
Deafness
A general term for the complete or partial loss of the ability to hear from one or both ears. Deafness may result from ear diseases; vestibulocochlear nerve diseases; or brain diseases.
Tinnitus
Sounds that are perceived in the absence of any external noise source which may take the form of buzzing, ringing, clicking, pulsations, and other noises. Objective tinnitus refers to noises generated from within the ear or adjacent structures that can be heard by other individuals. The term subjective tinnitus is used when the sound is audible only to the affected individual. Tinnitus may occur as a manifestation of cochlear diseases; vestibulocochlear nerve diseases; intracranial hypertension; craniocerebral trauma; and other conditions.
Dizziness
Painless head discomfort with many possible causes including disturbances of vision, the brain, balance (vestibular) system of the inner ear, and gastrointestinal system. Dizziness is a medically indistinct term which laypersons use to describe a variety of conditions ranging from lightheadedness, unsteadiness to vertigo.
Vertigo
Dizziness.
Vomiting
The release of stomach contents through the mouth.
Skull
The bony framework of the head.
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Eight-day measles
An acute highly contagious viral disease with fever, runny nose, cough, red eyes, and a spreading skin rash. The eight-day measles is the ordinary measles, also known as rubeola, a potentially disastrous disease. Measles may be complicated by ear infections, pneumonia, encephalitis (that can cause convulsions, mental retardation. and even death), the sudden onset of low blood platelet levels with severe bleeding (acute thrombocytopenic purpura) or a chronic brain disease that occurs months to often years after an attack of measles (subacute sclerosing panencephalitis). During pregnancy measles may trigger miscarriages or premature delivery. Measles can be prevented through vaccination. The disease is also called the hard measles and (depending on how long you think it lasts) the seven- day measles, the nine-day measles, or the ten-day measles, and morbilli.
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Ehlers-Danlos syndrome
A heritable disorder of connective tissue with easy bruising, joint hypermobility (loose joints), skin laxity, and weakness of tissues. There are a number of different types of Ehlers-Danlos syndrome (EDS) which share the foregoing features but can be categorized into at least nine different types.
Ehlers-Danlos syndrome, dermatosparaxis type
A genetic disorder characterized by extremely fragile and sagging skin caused by mutation in the ADAMTS2 gene. People with this form of Ehlers-Danlos syndrome have soft, doughy skin that is very fragile and bruises easily. The skin sags and wrinkles, and extra (redundant) folds of skin may be present as children get older. Joints are very loose, which can delay the development of motor skills such as sitting, standing, and walking. Infants with the condition are born with a soft out-pouching called a hernia around the belly-button. Other symptoms include a small chin, a blue tinge to the part of the eyeball that is usually white (the sclera), and mild overgrowth of body hair.
Ehrlichiosis
An acute (abrupt onset) disease, clinically similar to Rocky Mountain spotted fever with high fever, headache, malaise, and muscle pain but without a rash. Laboratory features include leukopenia (low white blood cell count), thrombocytopenia (low platelet count), mild anemia, and elevation in the levels of hepatic aminotransferase enzymes. Clinical symptoms and laboratory abnormalities respond promptly to therapy with the antibiotics tetracycline or doxycycline, and the majority of patients become afebrile within 24 to 48 hours after the start of such treatment. The diagnosis of ehrlichiosis rests on the detection of ehrlichia either by direct means or by the indirect means of serologic studies. Three methods are available for detection: inspection of peripheral-blood smears, PCR testing, and tissue culture.
Eicosapentaenoic acid
One of the principal omega-3 fatty acids. Abbreviated EPA. The body has a limited ability to manufacture EPA by converting the essential fatty acid, alpha-linolenic acid (ALA) which is found in flaxseed oil, canola oil or walnuts.
Eight-day measles
An acute highly contagious viral disease with fever, runny nose, cough, red eyes, and a spreading skin rash. The eight-day measles is the ordinary measles, also known as rubeola, a potentially disastrous disease. Measles may be complicated by ear infections, pneumonia, encephalitis (that can cause convulsions, mental retardation. and even death), the sudden onset of low blood platelet levels with severe bleeding (acute thrombocytopenic purpura) or a chronic brain disease that occurs months to often years after an attack of measles (subacute sclerosing panencephalitis). During pregnancy measles may trigger miscarriages or premature delivery. Measles can be prevented through vaccination. The disease is also called the hard measles and (depending on how long you think it lasts) the seven- day measles, the nine-day measles, or the ten-day measles, and morbilli.
Eighth cranial nerve
Eisoptrophobia
An abnormal and persistent fear of mirrors. Sufferers experience undue anxiety even though they realize their fear is irrational. Because their fear often is grounded in superstitions, they may worry that breaking a mirror will bring bad luck or that looking into a mirror will put them in contact with a supernatural world inside the glass.
Ejaculatory duct
A canal in the male formed by union of the vas deferens and the duct from the seminal vesicle. The ejaculatory duct passes through the prostate. Semen passes through them at the time of ejaculation.
ELA2
The gene encoding the enzyme elastase 2 (neutrophilic elastase). Mutations in ELA2 cause cyclic neutropenia.
Elastase
An enzyme that digests and degrades a number of proteins including elastin, an elastic substance in the lungs and some other organs that supports their structural framework. Elastase is specifically inhibited by alpha-1 antitrypsin.
Elastase 1
Pancreatic elastase, a member of the pancreatic family of serine proteases. Although termed elastase, this powerful protease can hydrolyze numerous proteins, including elastin. The gene ELA1 that encodes elastase 1 is on chromosome 12q13.
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