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plane |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.07 sec. |
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plane, in mathematics, flat surface of infinite extent but no thickness. An example of a plane, or more exactly of a bounded portion of a plane, is the surface forming one face, or side, of a cube. A plane is determined, or defined, by any of the following: (1) three points not in a straight line; (2) a straight line and a point not on the line; (3) two intersecting lines; or (4) two parallel lines. Two straight lines in space do not usually lie in the same plane. For a given plane in space, a line can either lie outside and parallel to it, intersect the plane in a single point, or lie entirely in the plane; if more than one point of a straight line lies in the plane, then the entire line must lie in the plane. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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? Mentioned in | ? References in periodicals archive | |
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Frontal Plane (also called Coronal Plane)--runs vertically through the body and divides into anterior (front) and posterior (back) segments. Three tests that have been demonstrated to reflect the performance of the rotator cuff muscles were performed with the subject seated and the trunk stabilized: shoulder external rotation in neutral at 0 degrees of elevation, shoulder internal rotation in neutral at 0 degrees of elevation, and shoulder abduction at 90 degrees of elevation and 40 degrees anterior to the frontal plane and neutral shoulder rotation. 1,2) In adults without pathology, the femur is twisted so the head and neck of the femur are angled forward between 15 and 20 degrees from the frontal plane of the body. |
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