Nerve

A nerve is an enclosed, cable-like bundle of axons (nerve fibers, the long and slender projections of neurons) in the peripheral nervous system. A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons to peripheral organs.

In the central nervous system, the analogous structures are known as tracts. Neurons are sometimes called nerve cells, though this term is potentially misleading since many neurons do not form nerves, and nerves also include non-neuronal Schwann cells that coat the axons in myelin.

Each nerve is a cordlike structure that contains many axons. Within a nerve, each axon is surrounded by a layer of connective tissue called the endoneurium. The axons are bundled together into groups called fascicles, and each fascicle is wrapped in a layer of connective tissue called the perineurium. Finally, the entire nerve is wrapped in a layer of connective tissue called the epineurium.

Anatomy

Nerves are categorized into three groups based on the direction that signals are conducted:

Nerve (2013 film)

Nerve is a 2013 Australian psychological thriller film currently filming directed by Sebastien Guy. It stars Christian Clark and Georgina Haig.

Cast

External links

Nerve (upcoming film)

Nerve is an upcoming American drama thriller film directed by Henry Joost and Ariel Schulman and written by Jessica Sharzer, based on the novel Nerve by Jeanne Ryan. The film stars Dave Franco, Emma Roberts, Kimiko Glenn, Juliette Lewis, Emily Meade and Marc John Jefferies. Principal photography began on April 13, 2015 in New York City.

Cast

Production

In February 2014, it was announced that Henry Joost and Ariel Schulman would be directing the film, from a screenplay by Jessica Sharzer, based on the novel of the same name by Jeanne Ryan. In January 2015, it was announced that Emma Roberts and Dave Franco had joined the cast of the film. In April 2015, it was announced that Kimiko Glenn had joined the cast of the film, portraying the role of Emma Robert's characters worried friend. That same day, it was announced that rapper Richard "MGK" Baker had joined the cast of the film.

Complete quadrangle

In mathematics, specifically projective geometry, a complete quadrangle is a system of geometric objects consisting of any four points in a plane, no three of which are on a common line, and of the six lines connecting each pair of points. Dually, a complete quadrilateral is a system of four lines, no three of which pass through the same point, and the six points of intersection of these lines. The complete quadrangle was called a tetrastigm by Lachlan (1893), and the complete quadrilateral was called a tetragram; those terms are occasionally still used.

Diagonals

The six lines of a complete quadrangle meet in pairs to form three additional points called the diagonal points of the quadrangle. Similarly, among the six points of a complete quadrilateral there are three pairs of points that are not already connected by lines; the line segments connecting these pairs are called diagonals. Due to the discovery of the Fano plane, a finite geometry in which the diagonal points of a complete quadrangle are collinear, some authors have augmented the axioms of projective geometry with Fano's axiom that the diagonal points are not collinear, while others have been less restrictive.