Skeletal asymmetry

Kanchan, Tanuj; Kumar, TK Susheel; Kumar, G. Pradeep; Yoganarasimha, K.

doi:10.1016/j.jflm.2007.05.009

Cited by 51 publications

(48 citation statements)

References 8 publications

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“…This right-sided dominance in hand dimensions is related to handedness of individuals. More stress and strain on the dominant side, depending on the occupation, may cause differences between the sides, often referred to as directional asymmetry [51]. As far as bilateral asymmetry is concerned, studies by Bhatnagar et al [20] and Agnihotri et al [25] did not demonstrate any significant right or left differences in both hands.…”

Section: Tablementioning

confidence: 99%

A study of correlation of hand and foot dimensions for personal identification in mass disasters

Kanchan

Krishan

Sharma

et al. 2010

Forensic Science International

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Section: Tablementioning

confidence: 99%

A study of correlation of hand and foot dimensions for personal identification in mass disasters

Kanchan

Krishan

Sharma

et al. 2010

Forensic Science International

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“…In contrast, the opposite DA (i.e., larger and thicker bones on the left) is found for the lower extremities, which have been hypothesized to originate from a compensation to balance the more intensified use of the right arm. This pattern is termed cross-asymmetry and has been observed at the individual level and population level (Auerbach & Ruff, 2006;Kanchan et al, 2008).…”

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confidence: 94%

“…Although handedness has a genetic basis, it is influenced by environmental factors as well (Tang & Verstynen, 2002). In humans, the majority of individuals is right-handed, i.e., they preferentially use the right hand for many tasks, which is thought to lead to longer and thicker bones in the right upper extremities (Auerbach & Ruff, 2006;Kanchan, Kumar, Kumar, & Yoganarasimha, 2008). In contrast, the opposite DA (i.e., larger and thicker bones on the left) is found for the lower extremities, which have been hypothesized to originate from a compensation to balance the more intensified use of the right arm.…”

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confidence: 99%

When right differs from left: Human limb directional asymmetry emerges during very early development

Dongen

Galis

Broek

et al. 2014

Laterality: Asymmetries of Body, Brain and Cognition

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The often observed directional asymmetry (DA) in human limb bones may have a genetic/developmental basis and/or could emerge from different mechanical loadings across sides due to handedness. Because behavioural lateralization in itself has a genetic basis, it has been suggested that DA in limbs could develop prenatally as a pre-adaptation to adult life. However, the presence of consistent differences in the size of left and right limb bones in early development is understudied. We study asymmetry in limb bones during early development (10-20 weeks of gestation) in a sample of 178 aborted foetuses. Statistically significant DA was found in several upper and lower limb bones, where the right-hand side was consistently larger than the left. We argue that this pattern is probably the consequence of developmental processes related to internal asymmetric positioning of organs.

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“…A dominance of right handedness is found among recent humans, historic populations, fossil hominids but also nonhuman primates [72][73][74][75][76][77][78][79][80][81][82][83]. Directional asymmetry of the upper limbs is also influenced by working conditions [16,[77][78][79][80][81][82][83][84][85][86][87][88][89], and working conditions differed between !Kung san males who followed a hunter gatherer subsistence and Kavango men who were horticultural pastoralists. On the other hand, directional asymmetry patterns triggered by handedness can also be interpreted as signs of fitness.…”

Section: Discussionmentioning

confidence: 99%

Androgen Levels and Body Size Are Associated with Directional as Well as Fluctuating Asymmetry Patterns in Adult !Kung San and Kavango Males from Northern Namibia

Kirchengast

Christiansen

2017

Symmetry

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Abstract:Fluctuating asymmetry is mainly interpreted as an indicator of developmental instability, while directional asymmetry of the upper limbs is associated with handedness. The association patterns between adult androgen levels and fluctuating as well directional asymmetry patterns are still unclear. In the present study, the association between adult androgen levels, body size and directional as well as fluctuating asymmetry pattern was tested among !Kung San and Kavango males from northern Namibia. Serum concentrations of testosterone (Tser) and 5α-dihydrotestosterone (DHT) as well as salivary testosterone (Tsal) concentrations were obtained from 114 !Kung San and 136 Kavango men aged 18-40 years. Fluctuating and directional asymmetry were determined from eight paired traits. Signed and unsigned asymmetry, composite fluctuating and directional asymmetry were calculated. !Kung San males surpassed their Kavango counterparts in the directional asymmetry but also in composite directional asymmetry (CDA) significantly. Among !Kung San males, DHT correlated significantly negatively with parameters of fluctuating asymmetry as well as with parameters of directional asymmetry. Free testosterone of the saliva correlated significantly negatively with asymmetry of hand length. Among Kavango males, DHT is negatively associated with foot breadth asymmetry, but positively associated with wrist asymmetry. Although the correlations between asymmetry patterns and androgen levels are weak, it can be concluded that among !Kung San males adult androgen levels are negatively associated with a high quality phenotype.

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Skeletal asymmetry

Cited by 51 publications

References 8 publications

A study of correlation of hand and foot dimensions for personal identification in mass disasters

A study of correlation of hand and foot dimensions for personal identification in mass disasters

When right differs from left: Human limb directional asymmetry emerges during very early development

Androgen Levels and Body Size Are Associated with Directional as Well as Fluctuating Asymmetry Patterns in Adult !Kung San and Kavango Males from Northern Namibia

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