Objective determination of anatomical landmarks on the body surface: Measurement of the vertebra prominens from surface curvature

1985 ◽  
Vol 18 (6) ◽  
pp. 467-474 ◽  
Author(s):  
B Drerup ◽  
E Hierholzer
Author(s):  
Xiang Liu ◽  
Wangdo Kim ◽  
Burkhard Drerup

The anatomical landmarks on the body surface are important to shape and motion analysis. This paper presents a method for extracting anatomical landmarks on the foot from scattered 3D surface points collected by FastSCAN (Polhemus, Colchester, Vermont, USA). By least squares surface fitting, the surface is reconstructed from the scattered points and the Gaussian curvature and mean curvature are calculated. The landmarks formed by underlying muscles and skeletal structures distinguish themselves clearly on the Koenderink shape index maps. The loci of landmarks avail possible statistical shape analysis and medical applications such as tibial torsion measurement.


In the course of investigations on the production, distribution, and rate of disappearance in the body of immune substances, we were occupied in 1908 and previous years with a series of experiments on agglutinins, and we arrived at conclusions pointing to their close relationship to the blood and blood-forming organs (1, 2). In association with these inquiries, one of us (G. D.), together with W. Ray, published a communication on the relation­ship between the blood volume and the distribution of agglutinins within the circulation (3). It was there shown that the concentration of this substance (agglutinin) in the blood after inoculation into an animal was proportional to the body surface of the animal concerned, and was thus approximately proportional to the two-thirds power of the weight. Hence was deduced the conclusion that the blood volume of the animals examined was proportional to their body surface.


1965 ◽  
Vol 21 (3) ◽  
pp. 495-501 ◽  
Author(s):  
M. I. G. Bloor

The Newtonian theory of inviscid hypersonic flow is extended to obtain a solution uniformly valid in the subsonic region, and that is used to determine the position and shape of the sonic line. The main modification to the theory has to be made near the body surface and an expansion, essentially in terms of the stream function, is employed.For simplicity the solution is limited to the cases of axially- and plane-symmetric flows. As an illustration of the theory the flows past a sphere and a circular cylinder are treated in some detail. Comparison with the numerical results of Garabedian and Lieberstein gives favourable agreement.


1983 ◽  
Vol 17 (1) ◽  
pp. 13-17
Author(s):  
A. I. Levshankov ◽  
M. A. Pushkina ◽  
M. E. Slutskaya ◽  
B. S. Uvarov

2016 ◽  
Vol 3 (10) ◽  
pp. 160512 ◽  
Author(s):  
Daisuke Ishii ◽  
Hiroshi Yamasaki ◽  
Ryosuke Uozumi ◽  
Euichi Hirose

The body surface of aquatic invertebrates is generally thought to be hydrophilic to prevent the attachment of air bubbles. In contrast, some interstitial invertebrates, such as kinorhynchs and some crustaceans, have a hydrophobic body surface: they are often trapped at the water surface when the sediment in which they reside is mixed with air and water. Here, we directly measured the wettability of the body surface of the kinorhynch Echinoderes komatsui , using a microscopic contact angle meter. The intact body surface of live specimens was not hydrophobic, but the anterior part was less hydrophilic. Furthermore, washing with seawater significantly decreased the wettability of the body surface, but a hydrophilic surface was recovered after a 1 h incubation in seawater. We believe that the hydrophobic cuticle of the kinorhynch has a hydrophilic coat that is readily exfoliated by disturbance. Ultrastructural observations supported the presence of a mucus-like coating on the cuticle. Regulation of wettability is crucial to survival in shallow, fluctuating habitats for microscopic organisms and may also contribute to expansion of the dispersal range of these animals.


2020 ◽  
Vol 18 (Suppl.1) ◽  
pp. 695-698
Author(s):  
P. Angelova ◽  
P. Petkov

Reliable data on physical fitness and determination of the functional state of the body reflect the level of physical capabilities and the level of development of motor skills. Objective: Determination of individual physiometric indicators in students. Contingent: 130 female students of Trakia University. The average value of the vital capacity in the studied students is 3, 60, and vital indicator 61,61. With the left and right hand dynamometer, mean right hand values ​​of 15,46 kg were found, and left - 12,76 kg. Force strength is set at 63,42kg. Conclusion: The relative share of students with low values ​​of the vital capacity is high, the values ​​for dynamometry force are also low; there is a disproportion between good physical development due to acceleration factors and recorded retention or deterioration of physical capacity.


1992 ◽  
Vol 42 (1-2) ◽  
pp. 137-143 ◽  
Author(s):  
W. Stendel ◽  
H.-D. Hamel ◽  
H.-U. Sieveking ◽  
Deike Brühne

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