Abstract：
:Electron microscopy has been used to investigate whether the transversely striated columns of the connecting piece in the neck region of guinea pig spermatozoa, undergo lengthening and shortening as a result of the forces generated during motility. Motile spermatozoa were subjected to near-instantaneous rapid freezing, followed by freeze-substitution fixation and epoxy embedment. Thin sections passing longitudinally through the striated columns revealed that the periodicity was indeed variable. The repeat period, taken to have an unstressed width of 60 nm, could be found extended to 75 nm in some specimens, and reduced to 54 nm in others. The estimates of the coefficients of variation were 6.6% for the width of the 'dense' band and 33.5% for the 'pale' band. The 'pale' band in the extended state showed longitudinal striae. Such variations in length, which - it is suggested - are physiological, and passively induced, would have functional implications for the flagellum - for both bend initiation and bend growth. Also, hypothetically, any mechanism that could increase the degree of compliance in these columns, such as perhaps phosphorylation of the constituent proteins, could permit the flagellum to develop the exaggerated bend angles and asymmetries of the 'hyperactivated' state.
journal_name
J Anatjournal_title
Journal of anatomyauthors
Woolley DM,Carter DA,Tilly GNdoi
10.1111/j.1469-7580.2008.00919.xsubject
Has Abstractpub_date
2008-09-01 00:00:00pages
336-41issue
3eissn
0021-8782issn
1469-7580pii
JOA919journal_volume
213pub_type
杂志文章abstract：:Clinical research on the deposition of inhaled substances (e.g. inhaled medications, airborne contaminants, fumes) in the lungs necessitates anatomical models of the airways. Current conducting airway models lack three-dimensional (3D) reality as little information is available in the literature on the distribution of...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1046/j.0021-8782.2001.00018.x
更新日期：2002-02-01 00:00:00
abstract：:Androgen deficiency is one of the major factors leading to the development of osteoporosis in men. Since calcitonin (CT) is a potent antiresorptive agent, in the present study we investigated the effects of androgen deficiency and subsequent testosterone and estradiol treatment on CT-producing thyroid C cells, skeleta...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12013
更新日期：2013-03-01 00:00:00
abstract：:The total numbers of fibres in transverse histological sections of the pterygoid muscles of Lister rats of various ages were counted on enlarged photomicrographic prints. The number in the medial pterygoid of the male doubled between birth and six weeks. This was followed by a decrease of rather more than 10 percent i...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1975-04-01 00:00:00
abstract：:We examined the effects of exercise on diaphragm degeneration and cardiomyopathy in dystrophin-deficient mdx mice. Mdx mice (11 months of age) were exercised (swimming) for 2 months to worsen diaphragm degeneration. Control mdx mice were kept sedentary. Morphological evaluation demonstrated increased fibrosis in the d...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12443
更新日期：2016-05-01 00:00:00
abstract：:The total number of muscle fibres, as well as the numbers of Type I, Type II and intermediate muscle fibre types, in transverse sections of the pectineus muscles of dogs of 2 and 12 months of age was determined by an indirect fibre counting method. The total nubmers of fibres in all muscles decreased very significantl...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1980-01-01 00:00:00
abstract：:In the male rat the volumes of the several zones of the adrenal cortex were measured using a point-counting technique at various ages. The resulting growth curves were fitted by the Gompertz method, and the specific growth rate calculated for each zone at 14 days of age. Also at 14 days the flash labelling index was m...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1977-02-01 00:00:00
abstract：:Development of the neural crest involves a remarkable feat of coordinated cell migration in which cells detach from the neural tube, take varying routes of migration through the embryonic tissues and then differentiate at the end of their journey to participate in the formation of a number of organ systems. In general...
journal_title：Journal of anatomy
pub_type： 杂志文章,评审
doi：10.1046/j.1469-7580.1997.19140507.x
更新日期：1997-11-01 00:00:00
abstract：:The morphology of the cartilage-marrow interface in chick embryo tibiae has been studied from Day 11 to Day 14. The cartilage-marrow interface did not present a uniform aspect and three different areas could be defined. Most of the interface was lined by fibroblast-like cells, macrophage-like cells and multinucleate g...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1988-10-01 00:00:00
abstract：:The occurrence of pneumatisation in the skull of the adult domestic fowl was investigated in eight birds by gross and histological examination. It was found to occur regularly throughout the neurocranium and in the quadrate and variably in the mandible, but to be absent in the facial skeleton. Close agreement was foun...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1984-06-01 00:00:00
abstract：:The juxtaoral organ was studied using light microscopy in 55 human embryos and 90 fetuses at different stages of development. The juxtaoral organ arises from the epithelium at the bottom of the transverse opening of the primitive mouth during O'Rahilly stage 16 and becomes detached from the epithelium after O'Rahilly ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2005.00377.x
更新日期：2005-02-01 00:00:00
abstract：:A quantitative and morphological study was made of the corpus callosum in children to assess possible sex differences. The shape of the splenium of the corpus callosum was observed to vary between bulbous and cylindrical types with respect to the body of the callosum. The variation was not gender-specific and covariat...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1985-12-01 00:00:00
abstract：:In an adult skull a pre-interparietal bone was found to be present in two symmetrical pieces on either side of the midline. This is the result of failure of fusion of a third pair of centres with each other on the midline. The possibilities of variations due to non-fusion of various pairs of the centres in the interpa...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1987-06-01 00:00:00
abstract：:A defining feature of dentitions in modern sharks and rays is the regulated pattern order that generates multiple replacement teeth. These are arranged in labio-lingual files of replacement teeth that form in sequential time order both along the jaw and within successively initiated teeth in a deep dental lamina. Two ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12796
更新日期：2018-06-01 00:00:00
abstract：:The fabella is a sesamoid bone located in the gastrocnemius behind the lateral femoral condyle. In humans, fabellae are 3.5 times more common today than they were 100 years ago, with prevalence rates varying between and within populations. In particular, fabellae have been assumed to be more common in Asians than non-...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.13091
更新日期：2020-02-01 00:00:00
abstract：:The dentate nucleus is phylogenetically the most recent nucleus in the cerebellum. Owing to its connections to the thalamus and the prefrontal cortex it may be involved in the symptomathology in schizophrenia and other psychiatric illnesses. In this stereological study we implemented the smooth fractionator, which com...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.0021-8782.2004.00337.x
更新日期：2004-10-01 00:00:00
abstract：:Although seen frequently during dissections and autopsies, Hyperostosis frontalis interna (HFI) - a morphological pattern of the frontal bone thickening - is often ignored and its nature and development are not yet understood sufficiently. Current macroscopic classification defines four grades/stages of HFI based on t...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12506
更新日期：2016-11-01 00:00:00
abstract：:A new type of magnetic resonance imaging analysis, based on fusion of three-dimensional reconstructions of time-to-peak parametric maps and high-resolution T1-weighted images, is proposed in order to evaluate the perfusion of selected volumes of interest. Because in recent years a wealth of data have suggested the cru...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2006.00659.x
更新日期：2007-01-01 00:00:00
abstract：:Interosseous sutures exhibit highly variable patterns of interdigitation and corrugation. Recent research has identified fundamental molecular mechanisms of suture formation, and computer models have been used to simulate suture morphogenesis. However, the role of bone strain in the development of complex sutures is l...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2011.01386.x
更新日期：2011-08-01 00:00:00
abstract：:It is a challenge to understand how barn owls (Tyto alba) reduce noise during flight to be able to hunt small mammals by audition. Several specializations of the wing and the wing feathers have been implicated in noise reduction. What has been overlooked so far are the fringes at the inner vanes of remiges. We demonst...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2012.01504.x
更新日期：2012-07-01 00:00:00
abstract：:It is well accepted that the aortic plexus is a network of pre- and post-ganglionic nerves overlying the abdominal aorta, which is primarily involved with the sympathetic innervation to the mesenteric, pelvic and urogenital organs. Because a comprehensive anatomical description of the aortic plexus and its connections...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12251
更新日期：2015-01-01 00:00:00
abstract：:This pre-embedding electron-immunocytochemical study investigated the localisation of endothelial (type III) and neuronal (type I) isoforms of nitric oxide synthase, substance P, endothelin-1 and 5-hydroxytryptamine in the human middle cerebral artery taken up to 40 h postmortem. To ¿recover' from the anoxic period so...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1996-02-01 00:00:00
abstract：:The dogma that cutaneous wound healing is impaired as a function of age is largely unsubstantiated. This can be attributed to poor experimental design of human studies, the lack of subject characterisation with the exclusion of disease processes, and the study of inappropriate animal models. Structural and functional ...
journal_title：Journal of anatomy
pub_type： 杂志文章,评审
doi：
更新日期：1995-08-01 00:00:00
abstract：:Surgical interruption of the gastrointestinal tract is widely used for investigating the structure of the enteric nervous system and in the treatment of certain pathological conditions of the gastrointestinal tract. The effects of transection and end-to-end anastomosis and myotomy on nerve cells of the myenteric plexu...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1996-04-01 00:00:00
abstract：:Classic anatomical methods have failed to determine the precise location, origin and nature of nerve fibres in the inferior hypogastric plexus (IHP). The purpose of this study was to identify the location and nature (adrenergic and/or cholinergic) of IHP nerve fibres and to provide a three-dimensional (3D) representat...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/j.1469-7580.2009.01071.x
更新日期：2009-05-01 00:00:00
abstract：:The examination of endocranial data of archosauriforms has led to advances on the evolution of body size, nerve pathways, and sensory abilities. However, much of that research has focused on bird-line archosaurs, resulting in a skewed view of Archosauria. Phytosauria, a hypothesized sister taxon to or early-branching ...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1111/joa.12668
更新日期：2017-11-01 00:00:00
abstract：:The epithalamus is a major subdivision of the diencephalon constituted by the habenular nuclei and pineal complex. Structural asymmetries in this region are widespread amongst vertebrates and involve differences in size. neuronal organisation, neurochemistry and connectivity. In species that possess a photoreceptive p...
journal_title：Journal of anatomy
pub_type： 杂志文章,评审
doi：10.1046/j.1469-7580.2001.19910063.x
更新日期：2001-07-01 00:00:00
abstract：:Vascular sympathetic neuroeffector associations have been examined in rat iris arterioles using serial section electron microscopy and reconstruction techniques. Examination of random sections showed that, of all profiles of varicosities (199) seen to lie closer than 4 microns to vascular smooth muscle cells, only a s...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1046/j.1469-7580.1998.19210045.x
更新日期：1998-01-01 00:00:00
abstract：:It is well established that many tissue-derived factors are involved in blood vessel formation, but evidence is now emerging that endothelial cells themselves represent a crucial source of instructive signals to non-vascular tissue cells during organ development. Thus, endothelial cell signalling is currently believed...
journal_title：Journal of anatomy
pub_type： 杂志文章,评审
doi：10.1111/j.1469-7580.2007.00790.x
更新日期：2007-10-01 00:00:00
abstract：:Two cases with anomalous fascicles in abductor digiti minimi, noted in the course of dissecting 62 adult postmortem forearms, are described. Both fascicles arose from the flexor retinaculum and the antebrachial fascia; one was inserted into abductor digiti minimi and the other on the proximal phalanx of the 5th finger...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：
更新日期：1993-06-01 00:00:00
abstract：:This paper reports on the development of a theoretical model to simulate the growth and repair of microdamage in bone. Unlike previous theories, which use simplified descriptions of damage, this approach models each individual microcrack explicitly, and also models the basic multicellular units (BMUs) that repair crac...
journal_title：Journal of anatomy
pub_type： 杂志文章
doi：10.1046/j.1469-7580.2003.00194.x
更新日期：2003-08-01 00:00:00
