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vertex

 [ver´teks]
the summit or top, especially the top of the head (ver´tex cra´nii).
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ver·tex

, pl.

ver·ti·ces

(ver'teks, vĕr'ti-sēz), [TA]
1. The topmost point of the vault of the skull, a landmark in craniometry.
2. obstetrics the portion of the fetal head bounded by the planes of the trachelobregmatic and biparietal diameters, with the posterior fontanel at the apex.
[L. whirl, whorl]
Farlex Partner Medical Dictionary © Farlex 2012

vertex

(vûr′tĕks′)
n. pl. ver·tices (-tĭ-sēz′) also ver·texes
1. The highest point; the apex or summit: the vertex of a mountain.
2. Anatomy
a. The highest point of the skull.
b. The top of the head.
3. In astrology, the highest point reached in the apparent motion of a celestial body.
4. Mathematics
a. The point at which the sides of an angle intersect.
b. The point on a triangle or pyramid opposite to and farthest away from its base.
c. A point on a polyhedron common to three or more sides.
d. A point of maximal curvature on a parabola or hyperbola.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

ver·tex

, pl. vertices (vĕr'teks, -ti-sēz) [TA]
1. The topmost point of the vault of the cranium, a landmark in craniometry.
2. obstetrics The portion of the fetal head bounded by the planes of the trachelobregmatic and biparietal diameters, with the posterior fontanel at the apex.
[L. whirl, whorl]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

vertex

1. The top of the head.
2. Any apex or highest point on a body structure.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

vertex

  1. an area on the head of an insect between the compound eyes.
  2. the top of the head.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

vertex

The point where the optical axis intersects a reflecting or refracting surface. In a spectacle lens the back vertex is the point of intersection of the optical axis with the surface nearest to the eye, the other being the front vertex. Plural: vertices.
vertex depth Distance between the posterior pole of a spectacle lens and the plane containing the posterior edge of the lens. The vertex depth s is given by the following formula
s = r − Î(r2y2)
where r is the radius of curvature of the surface of the spectacle lens and y is the semi-diameter at the edge of the surface (Fig. V3). Syn. sag. See apical clearance; lens measure.
vertex distance Distance along the line of sight between the apex of the cornea and the posterior surface of a spectacle lens. This distance normally varies between 11 mm and 15 mm. See apical clearance; spectacle plane.
vertex focal length The linear distance separating the principal focal point (focus) of an optical system or lens from the front or back vertices. They are called the front vertex focal length (fv) and the back vertex focal length (fv), respectively. In the case of a biconcave or biconvex lens the front and back vertex focal lengths are equal. In the case of a positive meniscus lens, the back vertex focal length is shorter than the front vertex focal length and vice versa in the case of a negative meniscus lens. See back vertex power; front vertex power.
vertex power See back vertex power; front vertex power.
Fig. V3 Vertex depth (or sagittal depth) s of a spherical surface ( r , radius of curvature; 2 y , diameter of the surface)enlarge picture
Fig. V3 Vertex depth (or sagittal depth) s of a spherical surface (r, radius of curvature; 2y, diameter of the surface)

Table V1 Vertex depths of various spherical surfaces. They also represent the centre thickness of a planoconvex lens with a front surface of radius of curvature r and diameter 2y, with an edge thickness of zero. Index of refraction of the lens 1.49
lens diameter 2y (mm)
surface power (D)radius r (mm)40506070
14900.410.640.921.25
22450.821.281.842.51
3163.31.231.922.783.79
4122.51.642.583.735.11
5982.063.244.706.46
681.72.493.925.717.88
7702.924.626.759.38
861.33.385.337.8510.99
954.43.816.089.0112.74
10494.276.8610.2614.71
1240.85.238.5513.1319.80
14356.2810.5116.9735.00
1630.67.4312.9424.47
1827.28.7516.45
2024.510.35
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

Patient discussion about vertex

Q. What could make the top of your head hurt to the touch. I don't have a headache. It just hurts when I touch It only hurts on the left side.

A. if it's a deep pain- it might be caused by a trauma to the bode. have you been hurt by something..? if you don't remember - it might be a memory loss from the hit to the head :)
if it's a sort of superficial pain- it might be caused of a wound there. ask someone to have a look and see if there's anything over there. it could even be a tic sitting there...

More discussions about vertex
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References in periodicals archive ?
VirTex is based in Austin, TX, and has manufacturing facilities in Wisconsin, New Jersey, Massachusetts, Virginia, and Juarez, Mexico.
VirTex Enterprises manufactures printed circuit board assemblies and other critical electronic systems for small and medium-sized customer programmes across a wide range of industries, including industrial, aerospace and defense, automotive and medical.
It is clear from results that Keccak is far ahead of other four candidates, on both Virtex 5 and Virtex 6, in terms of throughput per area for both 256-bit and 512-bit variants.
Because of the slow wetting of Pb-free solder pastes, VirTex has experienced issues with achieving complete OSP removal.
AUSTIN, TX -- VirTex Enterprises has acquired fellow EMS firm PPI-Time Zero for an undisclosed sum.
The new members of this flexible system concept are the proFPGA Zynq UltraScale+ ZU11EG, ZU17EG and ZU19EG FPGA modules, which can easily be mounted on the proFPGA uno, duo or quad motherboards and mixed with other proFPGA FPGA modules like Virtex-7, Virtex UltraScale, Virtex UltraScale+ or Kintex UltraScale modules.
Enyx has launched its new FPB2 platform powered by the Xilinx Virtex UltraScale+, a pioneering FPGA that brings its nxFeed solution to the forefront of the market, the company said.
17 January 2014 - US electronic assembly maker VirTex Enterprises LP said it had taken over local sector company MTI Electronics Inc, without disclosing financial details.
The RC340 reportedly features a 16M Gate Xilinx Virtex 4 FPGA, direct access to 32Mb of pipelined SRAM, a DIMM socket for DRAM, as well as dual video inputs and outputs, including both digital video to the DVI standard and analogue video.The RC340 is also available with the PixelStreams video IP library and a suite of electronic system level (ESL) design software.
When Steve Martin - the still youthful managing director of Virtex - set up the firm in 1995, he was just 24-years old and with plenty of time ahead of him taking a risk was part of life.
(Nasdaq:XLNX) has announced immediate availability of the UltraController-II microcontroller reference design that provides a high performance, logic-optimized solution based on the industry standard PowerPC 405 processor immersed in Xilinx Virtex Platform FPGAs.