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Sexual dimorphism and interpopulation variability of the skull in time-distanced populations
Šutoová, Denisa ; Bejdová, Šárka (advisor) ; Suchá, Barbora (referee)
This diploma thesis deals with sexual dimorphism and interpopulation variability of skull morphology between recent Egyptian population and a historical population, which is not geographically distanced but originates from the Old Kingdom period (Egypt, 2700-2180 BC). Estimating sex and population affinity is an important part of the process of building a biological profile of unknown human remains, and the skull is one of the best parts of the skeleton to estimate these attributes. Sex estimation is based on the existence of sexual dimorphism, which is very population specific, and sex determination is more reliable when population-specific methods are applied. Therefore, it is required to perform population affinity estimation before sex determination. A total of 143 adult specimens were included in the analysis. 47 three-dimensional exocranial meshes of skulls of individuals originating from the Old Kingdom period (31 males and 16 females) and 96 CT images of the heads from the recent Egyptian population in the age range of 18-86 years. (49 males and 47 females). The material was evaluated using the methods of geometric morphometry. In the analysis of the form, significant differences between the sexes were found. The most sexually dimorphic areas were the supraorbital arches, glabella, arcus...
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The variability of facial expressions in relation to age and sex: pilot study for monitoring the treatment of facial palsy.
Danková, Simona ; Velemínská, Jana (advisor) ; Schmidová, Kamila (referee)
This thesis deals with the analysis of 3D morphological changes and variability in the shape and form of facial expression during five specifically defined facial expressions (raising eyebrows, close both eyes, lips pursing, inflating both cheeks, smile). Changes in facial expression were evaluated in relation to sexual dimorphism and age category of probands using the methods of geometric morphometrics (Dense Correspondence Analysis, Paired Analysis, Principal Component Analysis, Shell-to-Shell Deviation) in program Morphome3cs and RapidForm. The analysis consisted of evaluating the surface of soft tissue changes that occur due to the contraction of facial muscles. Materials used for the analysis are 3D surface facial models of adult healthy people of the Czech nationality (63 women, 58 men) in the age interval 20-60 years. We considered methodology based on Paired Analysis to be more accurate, when we worked only with differences between the neutral expression and facial expression. By choosing a Paired Analysis, we prevented the morphological features of the face from being reflected into the results. Morphological features are a manifestation of sexual dimorphism or age factor as such, but they are not themselves the essence of facial expression. In this way, we analyzed the shape of the face after...
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The variability of facial expressions in relation to age and sex: pilot study for monitoring the treatment of facial palsy.
Danková, Simona ; Velemínská, Jana (advisor) ; Schmidová, Kamila (referee)
This thesis deals with the analysis of 3D morphological changes and variability in the shape and form of facial expression during five specifically defined facial expressions (raising eyebrows, close both eyes, lips pursing, inflating both cheeks, smile). Changes in facial expression were evaluated in relation to sexual dimorphism and age category of probands using the methods of geometric morphometrics (Dense Correspondence Analysis, Paired Analysis, Principal Component Analysis, Shell-to-Shell Deviation) in program Morphome3cs and RapidForm. The analysis consisted of evaluating the surface of soft tissue changes that occur due to the contraction of facial muscles. Materials used for the analysis are 3D surface facial models of adult healthy people of the Czech nationality (63 women, 58 men) in the age interval 20-60 years. We considered methodology based on Paired Analysis to be more accurate, when we worked only with differences between the neutral expression and facial expression. By choosing a Paired Analysis, we prevented the morphological features of the face from being reflected into the results. Morphological features are a manifestation of sexual dimorphism or age factor as such, but they are not themselves the essence of facial expression. In this way, we analyzed the shape of the face after...
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Role of steroid hormones in control of sexually dimorphic traits in eyelid geckos (Eublepharidae)
Tóthová, Lucia ; Kratochvíl, Lukáš (advisor) ; Landová, Eva (referee)
The importance of sex hormones in formation, development and regulation of sexually dimorphic behavior does not need to be stressed. However, their actual organizational and activational effects and interactions in sexual differentiation and determination are not fully understood yet. The aim of our study was to explore the effects of hormonal manipulation in eyelid-geckos (family Eublepharidae) and enlighten the role of steroid hormones in formation of sexual differences. In the first part of our work we tried to reverse sex of Yucatán banded gecko (Coleonyx elegans) by hormonal manipulation in the early embryogenesis. This species has genotypic sex determination with chromosome set X1X2Y. In reverted individuals we aimed to examine the effects of steroid hormones on sexually dimorphic traits and in case of full sexual reversion and fertility of progeny, we would search for the sex-determining gene. In the second part, we studied masculinization effects of testosterone in females of leopard gecko (Eublepharis macularius). In contrast with the Coleonyx elegans mentioned above, this species has temperature dependent sex determination, even though these two species are closely related. Experimental females were implanted with testosterone implants and therefore their testosterone levels were increased in...
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