Abstract：
:The morphometry, histochemistry, and biomechanical relationships of rectus capitis muscles were examined in adult cats. This family of muscles contained six members on the dorsal, ventral, and lateral aspects of the upper cervical vertebral column. Three dorsal muscles (rectus capitis posterior major, medius, and minor) formed a layered complex spanning from C1 and C2 to the skull. Rectus capitis posterior major was composed predominantly of fast fibers, but the other two deeper muscles contained progressively higher proportions of slow fibers. One ventral muscle, rectus capitis anterior major, was architecturally complex. It originated from several cervical vertebrae and appeared to be divided into two different heads. In contrast, rectus capitis anterior minor and rectus capitis lateralis were short, parallel-fibered muscles spanning between the skull and C1. The ventral muscles all had nonuniform distributions of muscle-fiber types in which fast fibers predominated. Dorsal and ventral muscle groupings usually had cross-sectional areas of 0.5 cm2 or more, reflecting a potential capacity to generate maximal tetanic force in excess of 9 N. Biomechanical analyses suggested that one muscle, rectus capitis lateralis, had its largest moment in lateral flexion, whereas the other muscles had large, posturally dependent moment arms appropriate for actions in flexion-extension. The observation that most rectus muscles have relatively large cross-sectional areas and high fast-fiber proportions suggests that the muscles may have important phasic as well as postural roles during head movement.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Selbie WS,Thomson DB,Richmond FJdoi
10.1002/jmor.1052160107subject
Has Abstractpub_date
1993-04-01 00:00:00pages
47-63issue
1eissn
0362-2525issn
1097-4687journal_volume
216pub_type
杂志文章abstract：:Sipuncula is a clade of unsegmented marine worms that are currently placed among the basal radiation of conspicuously segmented Annelida. Their new location provides a unique opportunity to reinvestigate the evolution and development of segmented body plans. Neural segmentation is clearly evident during ganglionic ven...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21054
更新日期：2019-11-01 00:00:00
abstract：:The enteric nervous system consists of a number of interconnected networks of neuronal cell bodies and fibers as well as satellite cells, the enteric glia. Basic fibroblast growth factor (bFGF) is a mitogen for a variety of mesodermal and neuroectodermal-derived cells and its presence has been described in many tissue...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10252
更新日期：2004-09-01 00:00:00
abstract：:A novel approach is proposed toward quantifying changes in chaetotaxy during the development of Collembola Symphypleona. The ontogenetic trajectories method applied to the tibiotarsal chaetotaxy of Symphypleona provides a representation of their development. Every seta, through the probability of its presence, can be ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199602)227:2<127::AID-JMOR
更新日期：1996-02-01 00:00:00
abstract：:The nurse shark, Ginglymostoma cirratum, is an obligate suction feeder that preys on benthic invertebrates and fish. Its cranial morphology exhibits a suite of structural and functional modifications that facilitate this mode of prey capture. During suction-feeding, subambient pressure is generated by the ventral expa...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10626
更新日期：2008-09-01 00:00:00
abstract：:Mandible development in the larval stages I-V of two palaemonid shrimp species, Palaemon elegans and Macrobrachium amazonicum, was analyzed using scanning electron microscopy, light microscopy, and confocal laser scanning microscopy. In contrast to the zoea I of P. elegans, first-stage larvae of M. amazonicum are nonf...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20299
更新日期：2014-11-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051420103
更新日期：1974-01-01 00:00:00
abstract：:Gross lung morphology is examined in representative species from four genera within the order Lagomorpha (Lepus californicus, Sylvilagus nuttalli, Oryctolagus cuniculus, Ochotona princeps), and compared with a representative rodent out-group (Spermophilus richardonsii). Examination of pulmonary morphology reveals seve...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199612)230:3<299::AID-JMOR
更新日期：1996-12-01 00:00:00
abstract：:Age and sex-related variations in sternum morphology may affect the thoracic injury tolerance. Male and female sternum size and shape variation was characterized for ages 0-100 from landmarks collected from 330 computed tomography scans. Homologous landmarks were analyzed using Procrustes superimposition to produce ag...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20302
更新日期：2014-11-01 00:00:00
abstract：:The common snook, Centropomus undecimalis, was induced to ovulate using a time-release, GnRH analogue. Ovulation occurred the afternoon or evening the day after hormone administration. The time of ovulation was established within half an hour. At ovulation, three fish per time-group were divided into 0, 6, 12, 18 hr a...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20652
更新日期：2017-04-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052090309
更新日期：1991-09-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10420
更新日期：2006-04-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章,评审
doi：10.1002/1097-4687(200007)245:1<29::AID-JMOR3>3.0.C
更新日期：2000-07-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20916
更新日期：2019-01-01 00:00:00
abstract：:Two types of sperm are produced in the silkworm, Bombyx mori. Nucleate eupyrene sperm is an ordinary sperm that contributes to fertilization, while anucleate apyrene sperm is considered to play important roles in assisting eupyrene sperm. At the very late stage of spermatogenesis, a phenomenon called "peristaltic sque...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10168
更新日期：2004-01-01 00:00:00
abstract：:The egg tooth of squamates evolved to facilitate hatching from mineralized eggshells. Squamate reptiles can assist their hatching with a single unpaired egg tooth (unidentates) or double egg teeth (geckos and dibamids). Egg tooth ontogeny in two gekkotan species, the leopard gecko Eublepharis macularius and the mourni...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21249
更新日期：2020-10-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199910)242:1<1::AID-JMOR2>
更新日期：1999-10-01 00:00:00
abstract：:At mating, female insects generally receive and store sperm in specific organs of their reproductive tract called spermathecae. Some Heteroptera, such as Cimicomorpha, lack a true spermatheca; some have receptacles of novel formation where sperm cells can transit or be stored. In Tingidae, there are two sac-like diver...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10811
更新日期：2010-04-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20185
更新日期：2013-12-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2018-05-01 00:00:00
abstract：:I focus on the crucial links between the discovery of nonhuman primates by Westerners, discussions on our place in nature, the chain of being, racism, and the history of primate comparative anatomy and of so-called "anatomical human racial studies." Strikingly, for more than a millennium humans knew more about the int...
journal_title：Journal of morphology
pub_type： 杂志文章,评审
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更新日期：2018-04-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2011-08-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10436
更新日期：2006-07-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20309
更新日期：2014-12-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051540204
更新日期：1977-11-01 00:00:00
abstract：:The stomach of decapods is a complex organ with specialized structures that are delimited by a cuticle. The morphology and ontogeny of the stomach are largely described, but few studies have focused on the morphology of its cuticle. This study examined the morphology of the stomach cuticle of cardiac sacs, gastric mil...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20949
更新日期：2019-03-01 00:00:00
abstract：:The colugos, or flying lemurs (Dermoptera), are arboreal gliding mammals that are commonly grouped with tree-shrews (Scandentia) and Primates in the superorder Euarchonta. However, little is known about the head and neck muscles of these gliding mammals. This raises difficulties for the discussion of not only the func...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10666
更新日期：2009-01-01 00:00:00
abstract：:Iridescent butterfly scales are structurally colored, relying upon the interaction of light with detailed architecture to produce their color. In some iridescent scales, the reflective elements are contained within the body of the scale and come in two basic forms, lattices that produce diffraction colors (analogous t...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052020106
更新日期：1989-10-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
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更新日期：2019-04-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052210210
更新日期：1994-08-01 00:00:00
abstract：:The structure, attachment and subsequent metamorphosis of larvae of the marine bryozoan Bugula neritina were studied by light and electron microscopy. Two points of larval anatomy are of special significance to proper interpretation of the metamorphosis: 1 Two cytologically similar blastemal tissues, each laden with f...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051340307
更新日期：1971-07-01 00:00:00
