Zewdi J Tsegai
Biographic Data
| ID | 1751531 |
|---|---|
| NAME | Zewdi J Tsegai |
| GIVEN NAMES | Zewdi J |
| FAMILY NAME | Tsegai |
| SIGNATURE | TSEGAI Z J |
| AFFILIATIONS | University of Chicago |
| ORCID | 0000-0001-9041-4829 |
| VERIFIED | Yes |
| TOTAL WORKS | 7 |
| TOTAL CITATIONS | 31 |
| AUTHOR COUNT | 7 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2015 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 3 |
Cranial vault thickness, its internal organization, and its relationship with endocranial shape in Neanderthals and modern humans
Compared to the more elongated crania of Neanderthals, modern humans have a rounder, more globular cranial vault. The factors contributing to this globular cranial and endocranial morphology remain poorly understood. Cranial vault thickness (CVT) plays a role in shaping the braincase. It has been proposed that CVT variation in hominins reflects distinct stimuli influencing the cranial vault layers to different degrees. We aim to determine to what…
Exploring facial gracilization through an integrated approach of mandibular ontogeny: Preliminary Results From Chimpanzees
The human face is characterized by a more gracile morphology compared to the more robust features observed in the human fossil record and among our ape relatives. Understanding the mechanisms of growth that lead to adult morphology is key to comprehending the timing and potential causes of the facial changes that occurred during human evolution. Documenting structural changes during ontogeny, such as shape changes, cortical thickening, and bone m…
Structural organization of the cranial vault in Neanderthals and present-day humans: Can endocranial shape characteristics be explained by vault thickness
In studies of hominin brain evolution the shape of the interior braincase (or endocranium) is often used to infer cortical organization. However, the braincase is not only shaped by brain, but also by the interplay of evolutionary and developmental changes of facial size and shape, the development of soft tissues, and neurocranial bone thickness. It therefore remains unclear to what extent the well-documented endocranial shape differences between…
Trabecular Analysis of the Distal Radial Metaphysis during the Acquisition of Crawling and Bipedal Walking in Childhood: A Preliminary Study
In modern day populations, children following a normal pattern of development acquire independent bipedal locomotion between the ages of 9 and 18 months. Variability in the timing of this psychomotor developmental milestone depends on various factors, including cultural influences. It is well known that trabecular bone adapts to changes in biomechanical loading and that this can be influenced by alternative locomotor modes, such as crawling, whic…
Ontogeny and variability of trabecular bone in the chimpanzee humerus, femur and tibia
OBJECTIVES: Trabecular bone structure is known to be influenced by joint loading during life. However, many additional variables have the potential to contribute to trabecular bone structure of an adult individual, including age, sex, body size, genetics, and overall activity level. There is little research into intraspecific variability in trabecular bone and ontogeny of trabecular bone structure, especially in nonhuman primates. MATERIALS AND M…
Trabecular and cortical bone structure of the talus and distal tibia in Pan and Homo
OBJECTIVES: Internal bone structure, both cortical and trabecular bone, remodels in response to loading and may provide important information regarding behavior. The foot is well suited to analysis of internal bone structure because it experiences the initial substrate reaction forces, due to its proximity to the substrate. Moreover, as humans and apes differ in loading of the foot, this region is relevant to questions concerning arboreal locomot…
Human-like hand use in Australopithecus africanus
Getting a grip The evolution of the hand—particularly the opposable thumb—was key to the success of early humans. Without a precise grip, involving forceful opposition of thumb with fingers, tool technology could not have emerged. Skinner et al. analyzed the internal bone structure of Pliocene Australopithecus hands, dated at 3.2 million years old. Internal bone structure reveals the patterns and directions of forces operating on the hand, provid…
Trabecular and cortical bone structure of the talus and distal tibia in Pan and Homo
OBJECTIVES: Internal bone structure, both cortical and trabecular bone, remodels in response to loading and may provide important information regarding behavior. The foot is well suited to analysis of internal bone structure because it experiences the initial substrate reaction forces, due to its proximity to the substrate. Moreover, as humans and apes differ in loading of the foot, this region is relevant to questions concerning arboreal locomot…
Ontogeny and variability of trabecular bone in the chimpanzee humerus, femur and tibia
OBJECTIVES: Trabecular bone structure is known to be influenced by joint loading during life. However, many additional variables have the potential to contribute to trabecular bone structure of an adult individual, including age, sex, body size, genetics, and overall activity level. There is little research into intraspecific variability in trabecular bone and ontogeny of trabecular bone structure, especially in nonhuman primates. MATERIALS AND M…
Trabecular Analysis of the Distal Radial Metaphysis during the Acquisition of Crawling and Bipedal Walking in Childhood: A Preliminary Study
In modern day populations, children following a normal pattern of development acquire independent bipedal locomotion between the ages of 9 and 18 months. Variability in the timing of this psychomotor developmental milestone depends on various factors, including cultural influences. It is well known that trabecular bone adapts to changes in biomechanical loading and that this can be influenced by alternative locomotor modes, such as crawling, whic…
Human-like hand use in Australopithecus africanus
Getting a grip The evolution of the hand—particularly the opposable thumb—was key to the success of early humans. Without a precise grip, involving forceful opposition of thumb with fingers, tool technology could not have emerged. Skinner et al. analyzed the internal bone structure of Pliocene Australopithecus hands, dated at 3.2 million years old. Internal bone structure reveals the patterns and directions of forces operating on the hand, provid…
Trabecular and cortical bone structure of the talus and distal tibia in Pan and Homo
OBJECTIVES: Internal bone structure, both cortical and trabecular bone, remodels in response to loading and may provide important information regarding behavior. The foot is well suited to analysis of internal bone structure because it experiences the initial substrate reaction forces, due to its proximity to the substrate. Moreover, as humans and apes differ in loading of the foot, this region is relevant to questions concerning arboreal locomot…
Ontogeny and variability of trabecular bone in the chimpanzee humerus, femur and tibia
OBJECTIVES: Trabecular bone structure is known to be influenced by joint loading during life. However, many additional variables have the potential to contribute to trabecular bone structure of an adult individual, including age, sex, body size, genetics, and overall activity level. There is little research into intraspecific variability in trabecular bone and ontogeny of trabecular bone structure, especially in nonhuman primates. MATERIALS AND M…
Trabecular Analysis of the Distal Radial Metaphysis during the Acquisition of Crawling and Bipedal Walking in Childhood: A Preliminary Study
In modern day populations, children following a normal pattern of development acquire independent bipedal locomotion between the ages of 9 and 18 months. Variability in the timing of this psychomotor developmental milestone depends on various factors, including cultural influences. It is well known that trabecular bone adapts to changes in biomechanical loading and that this can be influenced by alternative locomotor modes, such as crawling, whic…
Structural organization of the cranial vault in Neanderthals and present-day humans: Can endocranial shape characteristics be explained by vault thickness
In studies of hominin brain evolution the shape of the interior braincase (or endocranium) is often used to infer cortical organization. However, the braincase is not only shaped by brain, but also by the interplay of evolutionary and developmental changes of facial size and shape, the development of soft tissues, and neurocranial bone thickness. It therefore remains unclear to what extent the well-documented endocranial shape differences between…
Cranial vault thickness, its internal organization, and its relationship with endocranial shape in Neanderthals and modern humans
Compared to the more elongated crania of Neanderthals, modern humans have a rounder, more globular cranial vault. The factors contributing to this globular cranial and endocranial morphology remain poorly understood. Cranial vault thickness (CVT) plays a role in shaping the braincase. It has been proposed that CVT variation in hominins reflects distinct stimuli influencing the cranial vault layers to different degrees. We aim to determine to what…
Exploring facial gracilization through an integrated approach of mandibular ontogeny: Preliminary Results From Chimpanzees
The human face is characterized by a more gracile morphology compared to the more robust features observed in the human fossil record and among our ape relatives. Understanding the mechanisms of growth that lead to adult morphology is key to comprehending the timing and potential causes of the facial changes that occurred during human evolution. Documenting structural changes during ontogeny, such as shape changes, cortical thickening, and bone m…
Biology (7 works) · Anatomy (5 works) · Anatomy (5 works) · Evolution and Paleontology Studies (4 works) · Pleistocene-Era Hominins and Archaeology (4 works) · Osteoporosis (3 works) · Trabecular bone (3 works) · Bipedalism (2 works) · Cranial vault (2 works) · Endocrinology (2 works)