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Basic limb kinematics of small therian mammals.

A comparative study of quantitative kinematic data of fore- and hindlimb movements of eight different mammalian species leads to the recognition of basic principles in the locomotion of small therians. The description of kinematics comprises fore- and hindlimb movements as well as sagittal spine movements including displacement patterns of limb segments, their contribution to step length, and joint movements. The comparison of the contributions of different segments to step length clearly shows the proximal parts (scapula, femur) to produce more than half of the propulsive movement of the whol…

Surgical Reconstruction of the Metatarsal Pad Using Nonweight-Bearing Surfaces of the Footpads in a Dog.

A 9 yr old mixed-breed dog weighing 6.3 kg was presented with degloving injuries and multiple lacerations on the footpads of both hindlimbs. After amputation of the left hindlimb and debridement of the necrotic footpads on the right hindlimb, the remaining pads were insufficient for ambulation. The complete carpal pads and the peripheral, nonweight-bearing portions of the second and fifth digital pads of both forelimbs were harvested for pad grafting. All segments were sutured on the cutaneous trunci muscle in the predetermined location of the right abdominal wall for the pouch flap. After det…

Cellular preservation of musculoskeletal specializations in the Cretaceous bird Confuciusornis.

The hindlimb of theropod dinosaurs changed appreciably in the lineage leading to extant birds, becoming more 'crouched' in association with changes to body shape and gait dynamics. This postural evolution included anatomical changes of the foot and ankle, altering the moment arms and control of the muscles that manipulated the tarsometatarsus and digits, but the timing of these changes is unknown. Here, we report cellular-level preservation of tendon- and cartilage-like tissues from the lower hindlimb of Early Cretaceous Confuciusornis. The digital flexor tendons passed through cartilages, car…

The cartilage specific microRNA-140 targets histone deacetylase 4 in mouse cells.

MicroRNAs (miRNA) are short RNA molecules regulating the expression of specific mRNAs. We investigated the expression pattern and potential targets of mouse miR-140 and found that miR-140 is specifically expressed in cartilage tissues of mouse embryos during both long and flat bone development. MiR-140 expression was detected in the limbs of E11.5 embryos in the primorida of future bones both in the fore and hindlimb and across autopod, zeugopod and stylopod. All digits of E14.5 fore- and hindlimbs showed accumulation of miR-140, except the first digit of the hindlimb. MiR-140 expression was a…

Enhanced expression of limb malformations and axial skeleton alterations in legless mutants by transplacental exposure to retinoic acid.

This manuscript reports on the limb malformations and axial skeleton alterations found in legless fetuses and their heterozygote and wild-type littermates transplacentally exposed to all-trans-retinoic acid via a single intraperitoneal injection on Day 7, 8, 9, 9.5, 10, 10.5, or 11 of gestation. The most surprising aspect of the results was the temporal sensitivity of the legless mouse limb to exogenous retinoic acid. On Day 11, when both fore- and hindlimbs of nonmutant embryos can be made abnormal by retinoic acid and other teratogens, retinoic acid did not increase the frequency or severity…

Beyond autonomic neuromodulation: acetylcholinesterase inhibitor against peripheral artery disease.

The acetylcholinesterase inhibitor (AChEI)-based therapeutic strategies have been shown to have vasculoprotective properties in the animal model of hindlimb ischemia due to its activation of the endothelial cholinergic system. However, little is know about whether other cell types (myocytes, immunocytes) are involved in the AChEI-related therapeutic benefits in peripheral artery disease. Therefore, we review the multiple cell-targeted effects of AChEI on the animal model of hindlimb ischemia and explore its clinical application in angiomyogenesis.

Opioid modulation of facial itch- and pain-related responses and grooming behavior in rats.

Intradermal facial injections of pruritogens or algogens elicit distinct behavioral hindlimb scratch or forelimb wiping responses in rodents. We systematically investigated the parameters and opioid modulation of these evoked behaviors and spontaneous facial grooming in rats. Serotonin (5-HT) elicited hindlimb scratch bouts with few wipes. Scratching was attenuated by the µ-opiate antagonist naltrexone but not morphine. In contrast, cheek injection of mustard oil (allyl-isothiocyanate (AITC)) elicited ipsilateral forelimb wipes but little hindlimb scratching. AITC-evoked wiping was significant…

[Roles of TRPA1 in Painful Dysesthesia].

Dysesthesia is an unpleasant abnormal sensation, often accompanied by pain, paresthesia (abnormal sensation), and numbness (decrease or loss of sensation). Dysesthesia has been associated with various conditions, although its underlying mechanisms are largely unknown. This study assessed the roles of transient receptor potential ankyrin 1 (TRPA1) in dysesthesia by utilizing three animal models of dysesthesia characterized by reductions in blood flow to the skin: a transient hindlimb ischemia/reperfusion model, characterized by spontaneous licking and tactile hypoesthesia of the ischemic hindpa…

Gait recovery following spinal cord injury in mice: Limited effect of treadmill training.

BACKGROUND: Several studies in rodents with complete spinal cord transections have demonstrated that treadmill training improves stepping mo … ntitative kinematic gait analysis was used to assess the spatiotemporal characteristics of the left hindlimb prior to injury and at 1, 4, 7 and 10 weeks post-injury. RESULTS: One week after injury there was no movement of the left hindlimb and some animals dragged their foot. Treadmill training led to significant improvements in step duration, but had lim …

EUK-134 ameliorates nNOSμ translocation and skeletal muscle fiber atrophy during short-term mechanical unloading.

Reduced mechanical loading during bedrest, spaceflight, and casting, causes rapid morphological changes in skeletal muscle: fiber atrophy and reduction of slow-twitch fibers. An emerging signaling event in response to unloading is the translocation of neuronal nitric oxide synthase (nNOSμ) from the sarcolemma to the cytosol. We used EUK-134, a cell-permeable mimetic of superoxide dismutase and catalase, to test the role of redox signaling in nNOSμ translocation and muscle fiber atrophy as a result of short-term (54 h) hindlimb unloading. Fischer-344 rats were divided into ambulatory control, h…

The central action of the 5-HT2 receptor agonist 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) on cardiac inotropy and vascular resistance in the anaesthetized cat.

Experiments were carried out to determine the effects of the application of the selective 5-HT2 receptor agonist DOI intravenously (in the presence of the peripherally acting 5-HT2 receptor antagonist, BW501C67, 1 mg kg(-1), i.v.) or to the 'glycine sensitive area' of the ventral surface (30 microg each side) on the left ventricular inotropic (left ventricular dP/dt max) and vascularly isolated hindlimb responses in anaesthetized cats. For the ventral surface experiments, NMDA (10 microg each side) was applied to act as a positive control. In all experiments heart rate and mean arterial blood …

Anatomical features associated with preaxial duplication (pd): a recessive mutation in the rat.

Preaxial polydactyly of the fore- and hindlimbs was found in Wistar-derived rats in 1978. Genetic analysis indicated that the polydactyly was due to the effects of an autosomal recessive gene (gene symbol; pd). Polydactylous homozygous rats had two or three pollices (six or seven digits) in the forelimbs and one to three preaxial extra digits (six to eight digits) in the hindlimbs. Skeletal examination revealed the presence of the extra carpal, metacarpal, and phalangeal bones that seemed to be complete or incomplete duplication of the navicular, greater multangular, first metacarpal, and phal…

5-HT precursor loading, but not 5-HT receptor agonists, increases motor function after spinal cord contusion in adult rats.

Serotonergic (5-HT) receptors are upregulated following spinal cord transection. Stimulation by administration of serotonergic receptor agonists has been successful in improving hindlimb function. We tested whether this strategy would be successful in incomplete injury models (moderate or severe thoracic contusion) where descending projections are partially spared which should produce less denervation-induced receptor upregulation. Adult rats received midthoracic moderate (MOD: 25 mm drop) or severe (SEV: 50 mm drop) contusion injuries. Distribution of 5-HT and its transporter and expression o…

Knee joint input into the peripheral region of the ventral posterior lateral nucleus of cat thalamus.

1. Experiments were carried out in chloralose-anesthetized cats to study the responses of neurons in the lateral thalamus to excitation of a … ons responding to MAN stimulation were found to be dorsal or ventral to the low-threshold cutaneous hindlimb region of the lateral division of the VPL (stereotaxic coordinates: AP 9.0-11.5; ML 7.0-9.5). In the ventral periphery of the VPL, most neurons responding to MAN stimulation (11/14) were wide dynamic range (WDR) with a discrete cutaneous receptive f …

Защитное воздействие кварчена на экспериментальный склероз, вызванный купризоном, у самца C57BL/6 Мыши.

Цель этого исследования состояла в том, чтобы определить защитное воздействие Quercetiна на экспериментальный склероз (MS) в C57BL (Male)/6 Мыши. Forty мужского пола C57BL/6 Мыши были разделены на 4 Экспериментальные группы. Контрольная группа получила стандартную диету. Группа 2, мыши получили питание, содержащее 0.2 % (w/w) CPZ смешивается с наземным чау в течение всего периода 4 недель (Чху и др., 2021). Группа 3, мыши получили Quercetin150 мг/кг) в устной форме каждый день 4 недель. Группа 4, мыши получили диету 0.2 % CPZ и Quercetin150 мг/кг) перорально для 4 недель. После обнаружения при

Совпадение в аннотации оригинала
This study aimed to determine protective effect of the Quercetin on experimental cuprizone-induced (CPZ) multiple sclerosis (MS) in Male C57 … icantly decreased ambulation score, number of crosses using OFT (open field test), stay on rotarod, hindlimb foot angle, front- and hindlimb suspension and grip strength (P < 0.05). Quercetin significantly increased ambulation score, number of cross using, stay on rotarod, hindlimb foot angle, front- and hindlimb suspension and grip strength (P < 0.05). Ad …

Pathological lesions in the central nervous system and peripheral tissues of ddY mice with street rabies virus (1088 strain).

Most studies on rabies virus pathogenesis in animal models have employed fixed rabies viruses, and the results of those employing street rabies viruses have been inconsistent. Therefore, to clarify the pathogenesis of street rabies virus (1088 strain) in mice, 106 focus forming units were inoculated into the right hindlimb of ddY mice (6 weeks, female). At 3 days postinoculation (DPI), mild inflammation was observed in the hindlimb muscle. At 5 DPI, ganglion cells in the right lumbosacral spinal dorsal root ganglia showed chromatolysis. Axonal degeneration and inflammatory cells increased with…

Transection of the lateral and long digital extensor tendons in racehorses.

OBJECTIVE: To report on the outcome of wounds to the hindlimb of racehorses, and horses with the intended use of racing, where both the long digital extensor (LoDE) and lateral digital extensor (LaDE) tendons had been completely transected. DESIGN: Retrospective case series. METHODS: Records of all horses admitted with hindlimb lacerations between 2002 and 2009 were examined for cases where both the LoDE and LaDE tendons in the hindlimb had been severed, and specifically in horses intended to be used for racing. Outcome was assessed via retrieval of race records and via telephone questioning…

A longitudinal study of skeletal muscle following spinal cord injury and locomotor training.

STUDY DESIGN: Experimental rat model of spinal cord contusion injury (contusion SCI). OBJECTIVE: The objectives of this study were (1) to characterize the longitudinal changes in rat lower hindlimb muscle morphology following contusion SCI by using magnetic resonance imaging and (2) to determine the therapeutic potential of two types of locomotor training, treadmill and cycling. SETTING: University research setting. METHODS: After moderate midthoracic contusion SCI, Sprague-Dawley rats were assigned to either treadmill training, cycle training or an untrained group. Lower hindlimb muscle si…

Ground reaction forces in locomoting hemi-parkinsonian rats: a definitive test for impairments and compensations.

Hemi-parkinsonian rats have preserved postural reflexes but are impaired in initiation of voluntary movements. Surprisingly, these rats can … the affected limbs could support weight and provide some braking forces. In addition, the impaired hindlimb provided significant propulsive force, and a relatively large laterally directed force. Analysis of vertical movement of the centre of mass suggested that the impaired hindlimb was being used partly as a spring. The most significant abnormalities we …

Treadmill training enhances the recovery of normal stepping patterns in spinal cord contused rats.

Treadmill training is known to improve stepping in complete spinal cord injured animals. Few studies have examined whether treadmill training also enhances locomotor recovery in animals following incomplete spinal cord injuries. In the present study, we compared locomotor recovery in trained and untrained rats that received a severe mid-thoracic contusion of the spinal cord. A robotic device was used to train and to test bipedal hindlimb stepping on a treadmill. Training was imposed for 8 weeks. The robotic device supported the weight of the rats and recorded ankle movements in the hindlimbs f…