Fourth cranial nerve

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Fourth cranial nerve

Fourth cranial nerve

The fourth cranial nerve, the trochlear nerve, is the nerve supply to the superior oblique muscle of the eye, one of the muscles that moves the eye. Paralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, double vision).

RELATED TERMS
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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.

Superior
The anatomical term for "above". i.e. the head is superior to the shoulder. Typically used in humans only. See Cranial/Caudal/Inferior.

Muscle
Tissue made up of bundles of long, slender cells that contract when stimulated.

Eye
The organ of sight. The eye has a number of components. These components include but are not limited to the cornea, iris, pupil, lens, retina, macula, optic nerve, choroid and vitreous.

Paralysis
Inability to move parts of the body.

SIMILAR TERMS
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Four Hundred Bed Hospital
The Four Hundred Bed Hospital is a hospital in Pecs, Hungary.

Fourth disease
A disorder characterized by a rash due to a toxin produced by Staphylococcus aureus (Staph aureus bacteria).

Fourth stage of labor
The hour or two after delivery when the tone of the uterus is established and the uterus contracts down again expelling any remaining contents. These contractions are hastened by breast-feeding, which stimulates production of the hormone oxytocin.

Fourth ventricle
One cavity in a system of four communicating cavities within the brain that are continuous with the central canal of the spinal cord.

PREVIOUS AND NEXT TERMS
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Fornix
In anatomy, a vaultlike or arched structure.

Fornix cerebri
An arching fibrous band in the brain connecting the two lobes of the cerebrum. (The cerebrum is the largest part of the brain and consists of two hemispheres separated by a deep longitudinal fissure). Each fornix -- there are two -- in the brain is an arched tract of nerves.

Fornix conjunctivae
The fornix of the conjunctivae refers to loose arching folds connecting the conjunctival membrane lining the inside of the eyelid with the conjunctival membrane covering the eyeball.

Fornix uteri
The fornix of the uterus refers to the anterior (front) and posterior (back) recesses into which the upper vagina is divided. These vaultlike recesses are formed by protrusion of the cervix into the vagina. The fornix uteri is also known as the fornix vaginae (the vaginal fornix).

Founder effect
The positive effect on gene frequency when a population (a colony) has only a small number of original settlers (founders) one or more of whom had that gene. For example, the gene for Huntington disease was introduced into the Lake Maracaibo region in Venezuela early in the 19th century. So there are now over a hundred persons with Huntington disease and at least 900 persons at risk for that deadly disease in that region, the largest known aggregation with the Huntington gene in the world.

Fourth cranial nerve

Fourth disease
A disorder characterized by a rash due to a toxin produced by Staphylococcus aureus (Staph aureus bacteria).

Fourth stage of labor
The hour or two after delivery when the tone of the uterus is established and the uterus contracts down again expelling any remaining contents. These contractions are hastened by breast-feeding, which stimulates production of the hormone oxytocin.

Fourth ventricle
One cavity in a system of four communicating cavities within the brain that are continuous with the central canal of the spinal cord.

Fraction, ejection
The portion of blood that is pumped out of a filled ventricle as a result of a heartbeat. The heart does not eject all of the blood that is in the ventricle. Normally, about two-thirds of the blood is pumped out with each beat. That fraction is referred to the ejection fraction.

Fracture, basilar
A break in bone at the base of the skull. About a half of basilar fractures are caused by bicycle or motor vehicle accidents, about a quarter by falls, and a tenth by recreational activities, particularly by diving accidents. The balance are due to other causes. No matter what cause, the risk of death with a basilar fracture is appreciable. The term "basilar" means located at or near the base of a structure, especially the skull.

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This dictionary contains 25007 terms.

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