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Occipital Bone (occipital + bone)
Selected AbstractsMicro-focus X-ray computed tomography images of the 3D structure of the cranium of a fetus with asymmetric double malformationCONGENITAL ANOMALIES, Issue 1 2006Takashi Shibata ABSTRACT,, Reconstructed micro computed tomography (Micro-CT, µ-CT) images have revealed the detailed three-dimensional structure of the cranium of human fetal congenital anomalies for the first time. The objects were a head and a cervix of female autosite and a parasite consisting of only a head conjoined to the scapular region of the autosite of an asymmetric double malformation (asymmetric conjoined twins, heteropagus twinning) at a gestational age of 8 months. The cranium of the autosite was normal, but that of the parasite was characterized by otocephaly (agnathia, synotia, and monorhina) and almost all the cranial bones were of an abnormal shape. It is suggested that a part of occipital bone (the basioccipital and exoccipital bones), the vomer and cribriform plate were absent and this resulted in the fusion and overlapping of bilateral temporal and craniofacial bones that should have been adjacent to them. This resulted in a reformation and relocation of most of the cranial bones. Micro-CT is a useful tool to visualize the detailed bone structure which has not been clarified by the conventional dissection methods and other imaging technologies and is a powerful instrument for studying congenital anomalies. [source] Endocranial lesions in non-adult skeletons: understanding their aetiologyINTERNATIONAL JOURNAL OF OSTEOARCHAEOLOGY, Issue 2 2004M. E. Lewis Abstract Reactive new bone on the endocranial surface of the skull in non-adults has recently received a lot of attention in the palaeopathological literature. These features appear as layers of new bone on the original cortical surface, expanding around meningeal vessels, as isolated plaques, ,hair-on-end' extensions of the diploë or, as ,capillary' impressions extending into the inner lamina of the cranium. These lesions are commonly found on the occipital bone, outlining the cruciate eminence, but have also been recorded on the parietal and frontal bones, and appear to follow the areas of venous drainage. Although recognized as resulting from haemorrhage or inflammation, their precise aetiology is still a matter of controversy. This paper outlines their possible causes and examines their nature and distribution in a group of non-adults from four archaeological sites in England. It is recommended that, when recording these lesions in the future, additional skeletal pathologies, the age of the child, and nature and distribution of the lesions also be taken into account. Copyright © 2004 John Wiley & Sons, Ltd. [source] Primary Non-Hodgkin Lymphoma of the Skull Base Presenting with Garcin Syndrome: MRI ManifestationsJOURNAL OF NEUROIMAGING, Issue 3 2009Ayami Nakamura MD ABSTRACT Primary non-Hodgkin lymphoma of the skull base is a rare disorder. We report a case of primary non-Hodgkin lymphoma of the skull base presenting with Garcin syndrome. MRI revealed peculiar lesions in the cavernous sinus, clivus, and occipital bone. Diagnosis was made by biopsy of the tumor in the cavernous sinus. [source] Skull thickness in patients with cleftsORTHODONTICS & CRANIOFACIAL RESEARCH, Issue 2 2010T Arntsen To cite this article: Arntsen T, Kjær I, Sonnesen L, Mølsted K: Skull thickness in patients with clefts Orthod Craniofac Res 2010;13:75,81 Structured Abstract Authors,,, Arntsen T, Kjær I, Sonnesen L, Mølsted K Objectives,,, The purpose was to analyze skull thickness in incomplete cleft lip (CL), cleft palate (CP), and combined cleft lip and palate (UCLP). Setting and Sample Population,,, Copenhagen School of Dentistry and Copenhagen Cleft Lip and Palate Centre. Patients with cleft lip, cleft palate, and combined cleft lip and palate and normal adult men. Material and Methods,,, Four groups of patients comprised the study. One group of patients with CL (24 patients; 7 women, mean age 6; 17 men, mean age 7.1), one group of patients with UCLP (28 patients; 11 women, mean age 6.6; 17 men, mean age 6.7), one group of patients with CP (57 male patients aged 18,33), and one normal adult male control group. The CL and UCLP groups were compared. The CP group was compared with the normal adult male control group. Results,,, CL women had a significantly thinner occipital bone compared with CL men (p = 0.027). Women with UCLP had significantly thicker occipital bone than the control women (incomplete CL) (p = 0.014). The study showed gender differences in skull thickness in different cleft types. It also demonstrated that particularly the occipital bone deviated in patients with UCLP, which may explain the considerable deviations in jaw shape and position, previously registered in patients with UCLP. [source] A Preliminary Study of Solid Embryonic Cerebellar Graft Survival in Adult B6CBA Lurcher Mutant and Wild Type MiceTHE ANATOMICAL RECORD : ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY, Issue 12 2009Jan Cendelín Abstract Lurcher mutant mice represent a model of olivocerebellar degeneration. They suffer from complete loss of Purkinje cells and a reduction of granule cells and inferior olive neurons. Their wild type littermates serve as healthy controls. The aim of the work was to compare solid embryonic cerebellar graft survival within a period of 9 weeks after their transplantation in adult Lurcher mutant and wild type mice of the B6CBA strain. The solid grafts were injected through a hole in the occipital bone. Host mice were sacrificed 3, 6, or 9 weeks after the transplantation and their cerebella and brain-stems were examined histologically to assess graft presence and structure. We did not find significant differences in graft survival rates between Lurcher mutant and wild type mice. The frequency of graft presence did not differ between mice examined 3, 6, and 9 weeks after the transplantation, neither in Lurchers nor in wild type mice. The grafts were of various sizes. In some cases, only small residua of the grafts were found. Nerve fiber sprouting and cell migration from the graft to the host tissue were observed more often in wild type mice than in Lurchers when examined 6 weeks after surgery. In the period 3,9 weeks after transplantation, massive dying out of the grafts was not observed despite regressive processes in some of the grafts. The degenerative changes in the Lurcher mutant cerebellum do not have strong impact on the fate of the solid cerebellar graft. Anat Rec, 292:1986,1992, 2009. © 2009 Wiley-Liss, Inc. [source] The skull of Vanzosaura rubricauda (Squamata: Gymnophthalmidae)ACTA ZOOLOGICA, Issue 4 2009Cecilia Guerra Abstract A detailed description of the cranial osteology and chondrocranium of Vanzosaura rubricauda is made based both on articulated and partially disarticulated material of dry skeletons and cleared and stained specimens, and is compared with other previously studied gymnophthalmids. Some features of Vanzosaura are interesting, such as the reduction of the supratemporal fenestrae, that may reflect a process of miniaturization, and the fusion of the occipital bones in a single oto-occipital complex with no evident sutures. Based on the anatomical evidence, the skull of Vanzosaura is interpreted as amphikinetic. [source] Button osteoma: Its etiology and pathophysiologyAMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, Issue 3 2002Vered Eshed Abstract The present study investigates a circumscribed bony overgrowth on the cranial vault, known as button osteoma (BtO) and referred to here as button lesion (BtL). We discuss its anthropological implications. Data on its histology, location, and population distribution (by age, race, and gender) are provided. Microscopically, BtL is composed of well-organized dense lamellated bone which is poorly vascularized and with very few osteocytes. It forms a dome-shaped roof over an underlying diploeized area which includes the ectocranial table. The frequency of BtL is similar in modern (37.6%) and archaeological (41.1%) populations, in blacks, whites, males, and females, and correlates with age. It is rare in nonhuman primates. Fifty-five percent of the human skulls studied by us had BtL only on the parietal, 23.6% on the frontal, and 3.6% on the occipital bones. Fifteen percent had BtL on both the frontal and parietal bones. No lateral preference was found. Most skulls with BtL (64.1%) had only one lesion, 20.4% had two BtL, and 15.4% demonstrated multiple BtL. The average number of button osteomas on an affected skull was 1.97. The frequency of large osteomas (0.5,1.0 cm) was similar in young and old age groups. The demographic characteristics of BtL, mainly its high frequency among ancient and modern populations, its independence of sex and race, its scarcity in other primates, and the fact that its macro- and microstruture are indicative of an hamartoma (and not an osteoma or exostosis) suggest an evolutionary background to the phenomenon. Am J Phys Anthropol 118:217,230, 2002. © 2002 Wiley-Liss, Inc. [source] | |||||||||||||