Can scalp hair suddenly turn white? A case of canities subita

1970 ◽  
Vol 102 (1) ◽  
pp. 102-103 ◽  
Author(s):  
F. Helm
Keyword(s):  
Scalp Hair

Gender determination of caucasoid hair using image analysis

1993 ◽  
Vol 51 ◽  
pp. 216-217
Author(s):  
T.B. Ball ◽  
W.M. Hess
Keyword(s):  
Image Analysis ◽  
Cross Sections ◽  
Scalp Hair ◽  
The Body ◽  
Equivalent Diameter ◽  
Cross Sectional ◽  
Hair Samples ◽  
Length Width ◽  
Morphological Differences

It has been demonstrated that cross sections of bundles of hair can be effectively studied using image analysis. These studies can help to elucidate morphological differences of hair from one region of the body to another. The purpose of the present investigation was to use image analysis to determine whether morphological differences could be demonstrated between male and female human Caucasian terminal scalp hair.Hair samples were taken from the back of the head from 18 caucasoid males and 13 caucasoid females (Figs. 1-2). Bundles of 50 hairs were processed for cross-sectional examination and then analyzed using Prism Image Analysis software on a Macintosh llci computer. Twenty morphological parameters of size and shape were evaluated for each hair cross-section. The size parameters evaluated were area, convex area, perimeter, convex perimeter, length, breadth, fiber length, width, equivalent diameter, and inscribed radius. The shape parameters considered were formfactor, roundness, convexity, solidity, compactness, aspect ratio, elongation, curl, and fractal dimension.

Scalp hair loss after transsphenoidal adenomectomy in patients with acromegaly

2013 ◽  
Vol 79 (3) ◽  
pp. 386-393 ◽  
Author(s):  
Shozo Yamada ◽  
Noriaki Fukuhara ◽  
Hiroshi Nishioka ◽  
Mitsuo Yamaguchi-Okada ◽  
Akira Takeshita ◽  
...  
Keyword(s):  
Hair Loss ◽  
Scalp Hair ◽  
Transsphenoidal Adenomectomy

Human Handedness and Scalp Hair-Whorl Direction Develop From a Common Genetic Mechanism

Genetics ◽  
2003 ◽  
Vol 165 (1) ◽  
pp. 269-276
Author(s):  
Amar J S Klar
Keyword(s):  
Scalp Hair ◽  
Single Gene ◽  
Monozygotic Twins ◽  
Hand Preference ◽  
Genetic Mechanism ◽  
Internal Organs ◽  
Genetic Pathways ◽  
Left Hand ◽  
Learned Behavior ◽  
Random Mixture

Abstract Theories concerning the cause of right- or left-hand preference in humans vary from purely learned behavior, to solely genetics, to a combination of the two mechanisms. The cause of handedness and its relation to the biologically specified scalp hair-whorl rotation is determined here. The general public, consisting of mostly right-handers (RH), shows counterclockwise whorl rotation infrequently in 8.4% of individuals. Interestingly, non-right-handers (NRH, i.e., left-handers and ambidextrous) display a random mixture of clockwise and counterclockwise swirling patterns. Confirming this finding, in another independent sample of individuals chosen because of their counterclockwise rotation, one-half of them are NRH. These findings of coupling in RH and uncoupling in NRH unequivocally establish that these traits develop from a common genetic mechanism. Another result concerning handedness of the progeny of discordant monozygotic twins suggests that lefties are one gene apart from righties. Together, these results suggest (1) that a single gene controls handedness, whorl orientation, and twin concordance and discordance and (2) that neuronal and visceral (internal organs) forms of bilateral asymmetry are coded by separate sets of genetic pathways. The sociological impact of the study is discussed.

scholarly journals Elements alteration in scalp hair of young obese Saudi females

2021 ◽  
Vol 28 (1) ◽  
pp. 122-127
Author(s):  
Hessah Mohammed Al-Muzafar ◽  
Mohammed Taha Al-Hariri
Keyword(s):  
Scalp Hair

The lack of significant changes in scalp hair follicle density with advancing age

2005 ◽  
Vol 152 (4) ◽  
pp. 646-649 ◽  
Author(s):  
R. Sinclair ◽  
A. Chapman ◽  
J. Magee
Keyword(s):  
Hair Follicle ◽  
Scalp Hair

Two Cases of Cephalic Becker Nevus with Asymmetrical Growth of Beard or Scalp Hair

Dermatology ◽  
2003 ◽  
Vol 207 (3) ◽  
pp. 337-338 ◽  
Author(s):  
Hiram Larangeira de Almeida Jr. ◽  
Rudolf Happle
Keyword(s):  
Scalp Hair
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