Concerning the Cranial Development in the Greenish Elaenia, Myiopagis viridicata (Vieillot)

1967 ◽  
Vol 78 (2) ◽  
pp. 529 ◽  
Author(s):  
Raymond McNeil
Keyword(s):  
Cranial Development

scholarly journals Mammalian skull heterochrony reveals modular evolution and a link between cranial development and brain size

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Daisuke Koyabu ◽  
Ingmar Werneburg ◽  
Naoki Morimoto ◽  
Christoph P. E. Zollikofer ◽  
Analia M. Forasiepi ◽  
...  
Keyword(s):  
Brain Size ◽  
Cranial Development ◽  
Modular Evolution ◽  
Mammalian Skull

Subclassification of Anencephalic Human Fetuses According to Morphology of the Posterior Cranial Fossa

2004 ◽  
Vol 7 (6) ◽  
pp. 601-606 ◽  
Author(s):  
Jens Fog Lomholt ◽  
Birgit Fischer-Hansen ◽  
Jean W. Keeling ◽  
Ingermarie Reintoft ◽  
Inger Kjær
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Posterior Cranial Fossa ◽  
Cranial Morphology ◽  
Bony Tissue ◽  
Cranial Development ◽  
Future Assessment ◽  
The Central Nervous System ◽  
Cranial Fossa ◽  
Base Of The Skull

Anencephaly is a designation for congenital absence of the cranial vault with cerebral hemispheres completely missing or decreased to small masses attached to the base of the skull. The etiology is unknown. Whether the bony tissue or soft brain tissue is a primary factor is also unknown. The present study has focused on the posterior cranial fossa in anencephaly. The goal is to determine whether differences in the posterior cranial fossa could provide a basis for subclassification of anencephalic fetal skeletons. Twenty-three human anencephalic fetuses, at gestational ages 13 to 22 weeks, were studied. Radiologic and cephalometric analyses, including measurements of bone sizes and different angles, were performed. Permission for autopsy of the central nervous system was not available. For comparison of anencephalic findings with normal conditions, standards from a recent publication were used. Foot length served as a parameter for age comparison. The study showed 2 morphologic types of the posterior cranial fossa. One type had a fossa cranial morphology close to normal morphology, whereas the other had a malformed and much smaller posterior cranial fossa. The latter condition was presumed to be due to a primary error in chondral and cranial development. The current skeletal subgrouping might be essential for clinicians' or pathologists' future assessment of the autopsy results. The skeletal subgrouping should, if possible, be associated with karyotyping and analysis of the central nervous system. The goal is to distinguish between congenital conditions resulting in anencephaly and acquired conditions resulting in anencephaly.

scholarly journals Cranial bone histology ofMetoposaurus krasiejowensis(Amphibia, Temnospondyli) from the Late Triassic of Poland

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2685 ◽  
Author(s):  
Kamil Gruntmejer ◽  
Dorota Konietzko-Meier ◽  
Adam Bodzioch
Keyword(s):  
Bone Development ◽  
Cranial Bone ◽  
Late Triassic ◽  
Cranial Development ◽  
Biomechanical Loading ◽  
Calcified Cartilage ◽  
Single Bone ◽  
Occipital Condyles ◽  
Dermal Bones ◽  
Metoposaurus Krasiejowensis

In this study, 21 skull bones ofMetoposaurus krasiejowensisfrom the Late Triassic of Poland were investigated histologically. Dermal bones show a diploë structure, with an ornamented external surface. The ridges consist of mostly well vascularized parallel-fibered bone; the valleys are built of an avascular layer of lamellar bone. The thick middle region consists of cancellous bone, with varying porosity. The thin and less vascularized internal cortex consists of parallel-fibered bone. The numerous Sharpey’s fibers and ISF are present in all bones. The cyclicity of growth is manifested as an alternation of thick, avascular annuli and high vascularized zones as well as a sequence of resting lines. The detailed histological framework of dermal bones varies even within a single bone; this seems to be related to the local biomechanical loading of the particular part of the skull. The dynamic processes observed during the ornamentation creation indicate that the positions of the ridges and grooves change during growth and could be a specific adaptation to changing biomechanical conditions and stress distribution during bone development. In the supratemporal, the cementing lines show that the remodeling process could be involved in the creations of sculpture. The common occurrence of ISF suggests that metaplastic ossification plays an important role during cranial development. Endochondral bones preserved the numerous remains of calcified cartilage. This indicates that ossification follows a pattern known for stereospondyl intercentra, with relatively slow ossification of the trabecular part and late development of the periosteal cortex. The large accumulation of Sharpey’s fibers in the occipital condyles indicates the presence of strong muscles and ligaments connecting the skull to the vertebral column.

Predictive statistical model of early cranial development

2021 ◽  
pp. 1-1
Author(s):  
Antonio Reyes Porrasperez ◽  
Robert F Keating ◽  
Janice Lee ◽  
Marius George Linguraru
Keyword(s):  
Statistical Model ◽  
Cranial Development

scholarly journals The BMP Ligand Gdf6 Prevents Differentiation of Coronal Suture Mesenchyme in Early Cranial Development

PLoS ONE ◽  
2012 ◽  
Vol 7 (5) ◽  
pp. e36789 ◽  
Author(s):  
Dawn E. Clendenning ◽  
Douglas P. Mortlock
Keyword(s):  
Coronal Suture ◽  
Cranial Development
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