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  1. Article ; Online: Design and implementation of a low cost, modular, adaptable and open-source XYZ positioning system for neurophysiology.

    Campbell, Thomas / Jones, James F X

    HardwareX

    2020  Volume 7, Page(s) e00098

    Abstract: In recent years, open-source 3D printing technologies have become increasingly applied to biological research. We have created a fully open-source, versatile and low cost XYZ positioning system using 3D printer components. As this system is controlled by ...

    Abstract In recent years, open-source 3D printing technologies have become increasingly applied to biological research. We have created a fully open-source, versatile and low cost XYZ positioning system using 3D printer components. As this system is controlled by a Python3 based operating system running on a Raspberry Pi 3 Model B, its behaviour can be adapted to meet multiple needs in neurophysiology. We have developed two main applications of this system. First, we have created an automated microscopy script that links seamlessly with image stitching plugins in ImageJ (Fiji) allowing the user to create high resolution montages. Second, we have created a series of movement scripts allowing the application of graded rates of stretch to muscle spindles. Here we outline the construction and implementation of this system and discuss how we have utilised this tool in our research.
    Language English
    Publishing date 2020-02-07
    Publishing country England
    Document type Journal Article
    ISSN 2468-0672
    ISSN (online) 2468-0672
    DOI 10.1016/j.ohx.2020.e00098
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  2. Article ; Online: An animal model of faecal incontinence and sacral neuromodulation.

    Jones, James F X

    Irish journal of medical science

    2018  Volume 187, Issue 4, Page(s) 1149–1151

    Abstract: The pudendal nerves can be injured during traumatic vaginal childbirth and result in faecal incontinence. Some of these incontinent patients benefit from chronic sacral neuromodulation and the mechanism of action of this therapy has been a focus of many ... ...

    Abstract The pudendal nerves can be injured during traumatic vaginal childbirth and result in faecal incontinence. Some of these incontinent patients benefit from chronic sacral neuromodulation and the mechanism of action of this therapy has been a focus of many studies. In 2008, a rodent model of neuropathic faecal incontinence was introduced and subsequently validated through a series of investigations. This review summarizes the decade-long contribution of Professor Ronan O'Connell to the inception and application of this rodent model of faecal incontinence and sacral neuromodulation.
    MeSH term(s) Animals ; Disease Models, Animal ; Electric Stimulation Therapy ; Fecal Incontinence/history ; Fecal Incontinence/therapy ; History, 20th Century ; History, 21st Century ; Humans ; Ireland ; Lumbosacral Plexus ; Sacrum/innervation
    Language English
    Publishing date 2018-04-08
    Publishing country Ireland
    Document type Biography ; Historical Article ; Journal Article ; Review
    ZDB-ID 390895-1
    ISSN 1863-4362 ; 0021-1265
    ISSN (online) 1863-4362
    ISSN 0021-1265
    DOI 10.1007/s11845-018-1805-2
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  3. Article ; Online: Festschrift for Professor Ronan O'Connell.

    Jones, James F X

    Irish journal of medical science

    2018  Volume 187, Issue 4, Page(s) 1127–1128

    MeSH term(s) General Surgery/history ; History, 20th Century ; History, 21st Century ; Humans ; Ireland
    Language English
    Publishing date 2018-04-25
    Publishing country Ireland
    Document type Biography ; Editorial ; Historical Article ; Portrait
    ZDB-ID 390895-1
    ISSN 1863-4362 ; 0021-1265
    ISSN (online) 1863-4362
    ISSN 0021-1265
    DOI 10.1007/s11845-018-1822-1
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  4. Article ; Online: The Relationship Between Cortical Activation in Response to Anorectal Stimuli and Continence Behavior in Freely Behaving Rats Before and After Application of Sacral Nerve Stimulation.

    Evers, Judith / O'Connell, P Ronan / Jones, James F X

    Diseases of the colon and rectum

    2022  Volume 65, Issue 2, Page(s) 284–294

    Abstract: Background: Changes in anorectal sensation have been reported in patients with fecal incontinence, and there is limited evidence that sacral nerve stimulation can restore normal sensation.: Objective: The aims of the present study were to investigate ...

    Abstract Background: Changes in anorectal sensation have been reported in patients with fecal incontinence, and there is limited evidence that sacral nerve stimulation can restore normal sensation.
    Objective: The aims of the present study were to investigate changes in the transmission of sensory anorectal stimuli in a rodent model of fecal incontinence and to study the effects of sacral nerve stimulation on defecation behavior.
    Design: An established model of fecal incontinence was utilized for this study.
    Intervention: Pudendal nerve stretch and compression were used in 16 adult female Wistar rats and were monitored for 3 weeks: 6 rats received sacral nerve stimulation for 1 week by using an implantable neurostimulator and 10 rats had nonfunctioning "dummy" devices inserted. Five additional rats were sham operated. Anorectal cortical evoked potentials were used as a surrogate marker for anorectal sensory function.
    Main outcome measures: The primary outcomes measured were fecal incontinence index, evoked potential amplitude, and latency.
    Results: Fifty percent of rats showed behavioral signs of fecal incontinence measured by the Fecal Incontinence Index (>0.20), calculated by using the pellet distribution outside the cage's latrine area. Anorectal evoked potential amplitude was reduced in rats with a Fecal Incontinence Index >0.20 (p = 0.019). The amplitude of forepaw evoked potentials recorded as a control was not different between groups. Chronic sacral nerve stimulation using the fully implantable device and custom rodent lead was safe and stable during this chronic prospective study. Incontinent rats (n = 3) that received sacral nerve stimulation showed an improvement of Fecal Incontinence Index and an increase of evoked potential amplitude to anorectal stimulation compared with the dummy implant controls (n = 5).
    Limitations: The main limitation is the small number of animals that received sacral nerve stimulation.
    Conclusions: Chronic sacral nerve stimulation is feasible in rats when miniature telemetric devices are used. Behavioral signs of fecal incontinence were positively correlated with the latency of anorectal evoked potentials. See Video Abstract at http://links.lww.com/DCR/B712.RELACIÓN ENTRE LA ACTIVACIÓN CORTICAL EN RESPUESTA A LOS ESTÍMULOS ANORRECTALES Y EL COMPORTAMIENTO DE CONTINENCIA EN RATAS QUE SE COMPORTAN LIBREMENTE ANTES Y DESPUÉS DE LA APLICACIÓN DE ESTIMULACIÓN DEL NERVIO SACRO.
    Antecedentes: Se han informado cambios en la sensación anorrectal en pacientes con incontinencia fecal y hay evidencia limitada de que la estimulación del nervio sacro puede restaurar la sensación normal.
    Objetivo: Los objetivos del presente estudio fueron investigar los cambios en la transmisión de estímulos anorrectales sensoriales en un modelo de roedor de incontinencia fecal y estudiar los efectos de la estimulación del nervio sacro en la conducta de defecación.
    Diseo: Un modelo establecido de incontinencia fecal.
    Intervencin: Se utilizó estiramiento y compresión del nervio pudendo en 16 ratas Wistar hembras adultas y se les realizó un seguimiento durante 3 semanas: seis ratas recibieron estimulación del nervio sacro durante 1 semana utilizando un neuroestimulador implantable y diez ratas tuvieron insertados dispositivos "ficticios" no funcionantes. Se operaron simuladamente cinco ratas adicionales. Los potenciales evocados corticales anorrectales se utilizaron como marcador subrogado de la función sensorial anorrectal.
    Principales medidas de resultado: Índice de incontinencia fecal, amplitud de potenciales evocados y latencia.
    Resultados: El cincuenta por ciento de las ratas mostró signos de comportamiento de incontinencia fecal medidos por el Índice de incontinencia fecal (> 0.20), calculado utilizando la distribución de heces fuera del área de la letrina de la jaula. La amplitud del potencial evocado anorrectal se redujo en ratas con un índice de incontinencia fecal >0.20 (p = 0.019). La amplitud de los potenciales evocados de la pata delantera registrados como control no fue diferente entre los grupos. La estimulación crónica del nervio sacro utilizando un dispositivo totalmente implantable y un cable de roedor personalizado fue segura y estable durante este estudio prospectivo crónico. Las ratas con incontinencia (N = 3) que recibieron estimulación del nervio sacro mostraron una mejora del índice de incontinencia fecal y un aumento de la amplitud del potencial evocado a la estimulación anorrectal en comparación con los controles de implante ficticio (N = 5).
    Limitaciones: La principal limitación es el pequeño número de animales que recibieron estimulación del nervio sacro.
    Conclusiones: La estimulación crónica del nervio sacro es factible en ratas cuando se utilizan dispositivos telemétricos en miniatura. Los signos conductuales de incontinencia fecal se correlacionaron positivamente con la latencia de los potenciales evocados anorrectales. Consulte Video Resumen en http://links.lww.com/DCR/B712. (Traducción-Dr. Jorge Silva Velazco).
    MeSH term(s) Animals ; Cortical Excitability/physiology ; Disease Models, Animal ; Electric Stimulation Therapy/instrumentation ; Eliminative Behavior, Animal/physiology ; Fecal Incontinence/physiopathology ; Fecal Incontinence/psychology ; Fecal Incontinence/therapy ; Female ; Implantable Neurostimulators ; Rats ; Rats, Wistar ; Spinal Nerves
    Language English
    Publishing date 2022-01-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 212581-x
    ISSN 1530-0358 ; 0012-3706
    ISSN (online) 1530-0358
    ISSN 0012-3706
    DOI 10.1097/DCR.0000000000002038
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Distribution and morphology of sensory and autonomic fibres in the subendocardial plexus of the rat heart.

    Shenton, Fiona C / Campbell, Thomas / Jones, James F X / Pyner, Susan

    Journal of anatomy

    2020  Volume 238, Issue 1, Page(s) 36–52

    Abstract: Cardiac reflexes originating from sensory receptors in the heart ensure blood supply to vital tissues and organs in the face of constantly changing demands. Atrial volume receptors are mechanically sensitive vagal afferents which relay to the medulla and ...

    Abstract Cardiac reflexes originating from sensory receptors in the heart ensure blood supply to vital tissues and organs in the face of constantly changing demands. Atrial volume receptors are mechanically sensitive vagal afferents which relay to the medulla and hypothalamus, affecting vasopressin release and renal sympathetic activity. To date, two anatomically distinct sensory endings have been identified which may subserve cardiac mechanosensation: end-nets and flower-spray endings. To map the distribution of atrial receptors in the subendocardial space, we have double-labelled rat right atrial whole mounts for neurofilament heavy chain (NFH) and synaptic vesicle protein 2 (SV2) and generated high-resolution maps of the rat subendocardial neural plexus at the cavo-atrial region. In order to elucidate the nature of these fibres, double labelling with synaptophysin (SYN) and either NFH, calcitonin gene-related peptide (CGRP), choline acetyltransferase (ChAT) or tyrosine hydroxylase (TH) was performed. The findings show that subendocardial nerve nets are denser at the superior cavo-atrial junction than the mid-atrial region. Adluminal plexuses had the finest diameters and stained positively for synaptic vesicles (SV2 and SYN), CGRP and TH. These plexuses may represent sympathetic post-ganglionic fibres and/or sensory afferents. The latter are candidate substrates for type B volume receptors which are excited by stretch during atrial filling. Deeper nerve fibres appeared coarser and may be cholinergic (positive staining for ChAT). Flower-spray endings were never observed using immunohistochemistry but were delineated clearly with the intravital stain methylene blue. We suggest that differing nerve fibre structures form the basis by which atrial deformation and hence atrial filling is reflected to the brain.
    MeSH term(s) Animals ; Autonomic Nervous System/metabolism ; Calcitonin Gene-Related Peptide/metabolism ; Choline O-Acetyltransferase/metabolism ; Heart/innervation ; Immunohistochemistry ; Nerve Fibers/metabolism ; Rats ; Sensory Receptor Cells/metabolism ; Synaptophysin/metabolism ; Tyrosine 3-Monooxygenase/metabolism
    Chemical Substances Synaptophysin ; Tyrosine 3-Monooxygenase (EC 1.14.16.2) ; Choline O-Acetyltransferase (EC 2.3.1.6) ; Calcitonin Gene-Related Peptide (JHB2QIZ69Z)
    Language English
    Publishing date 2020-08-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2955-5
    ISSN 1469-7580 ; 0021-8782
    ISSN (online) 1469-7580
    ISSN 0021-8782
    DOI 10.1111/joa.13284
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  6. Article ; Online: Dual-extrusion 3D printing of anatomical models for education.

    Smith, Michelle L / Jones, James F X

    Anatomical sciences education

    2018  Volume 11, Issue 1, Page(s) 65–72

    Abstract: Two material 3D printing is becoming increasingly popular, inexpensive and accessible. In this paper, freely available printable files and dual extrusion fused deposition modelling were combined to create a number of functional anatomical models. To ... ...

    Abstract Two material 3D printing is becoming increasingly popular, inexpensive and accessible. In this paper, freely available printable files and dual extrusion fused deposition modelling were combined to create a number of functional anatomical models. To represent muscle and bone FilaFlex
    MeSH term(s) Anatomy/education ; Elasticity ; Elastomers ; Humans ; Models, Anatomic ; Neck/anatomy & histology ; Pliability ; Polyesters ; Printing, Three-Dimensional
    Chemical Substances Elastomers ; Polyesters ; poly(lactide) (459TN2L5F5)
    Language English
    Publishing date 2018-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2483491-9
    ISSN 1935-9780 ; 1935-9772
    ISSN (online) 1935-9780
    ISSN 1935-9772
    DOI 10.1002/ase.1730
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  7. Article ; Online: Highlights in basic autonomic neurosciences: The vagus and the ventricles.

    Jones, James F X

    Autonomic neuroscience : basic & clinical

    2012  Volume 170, Issue 1-2, Page(s) 1–2

    Language English
    Publishing date 2012-09-25
    Publishing country Netherlands
    Document type Comment ; Journal Article
    ZDB-ID 2020105-9
    ISSN 1872-7484 ; 1566-0702
    ISSN (online) 1872-7484
    ISSN 1566-0702
    DOI 10.1016/j.autneu.2012.07.006
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  8. Article ; Online: The projection of anorectal afferents to spinal cord and effect of sacral neuromodulation on dorsal horn neurons which receive such input in the rat.

    Turner, Keira / O'Connell, Patrick Ronan / Jones, James F X

    Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society

    2019  Volume 31, Issue 4, Page(s) e13536

    Abstract: Background: The rat has served usefully as a model for fecal incontinence and exploration of the mechanism of action of sacral neuromodulation (SNM). There remains a deficit in information regarding the location and type of spinal neurons which receive ... ...

    Abstract Background: The rat has served usefully as a model for fecal incontinence and exploration of the mechanism of action of sacral neuromodulation (SNM). There remains a deficit in information regarding the location and type of spinal neurons which receive anorectal input and the effect of SNM on those neurons.
    Methods: Single neuronal extracellular recordings of neurons receiving anorectal input were made at the S1 level of the spinal cord using sharp glass electrodes. SNM at S1 was delivered at 2 Hz for 3 minutes and its effect on discharge was quantified.
    Key results: In total, 31 units (n = 14 animals) receiving anorectal synaptic input were recorded at the first sacral (S1) segmental level in either lamina III or IV of the dorsal horn. The inputs were classified according to afferent fiber conduction speed (16 Aδ, 11 Aβ, and 4 C-fiber). The baseline firing frequency (ie, the mean firing frequency before the application of SNM) was 0.48 Hz ± 0.49 (mean ± SD) and 58% of units responded to acute SNM with either an increase or decrease in mean firing frequency.
    Conclusions & inferences: In this study, the majority of spinal neurons receiving anorectal input changed their activity in response to SNM. These findings provide the basis for future studies which aim to explore the precise cellular mechanism of action of SNM on this fecal continence pathway.
    MeSH term(s) Action Potentials/physiology ; Animals ; Electric Stimulation ; Female ; Neurons, Afferent/physiology ; Posterior Horn Cells/physiology ; Rats ; Rats, Wistar ; Sacrum ; Somatosensory Cortex/physiology ; Spinal Cord/physiology
    Language English
    Publishing date 2019-01-22
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1186328-6
    ISSN 1365-2982 ; 1350-1925
    ISSN (online) 1365-2982
    ISSN 1350-1925
    DOI 10.1111/nmo.13536
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  9. Article ; Online: Simulating Tissues with 3D-Printed and Castable Materials.

    O'Reilly, Michael / Hoff, Michael / Friedman, Seth D / Jones, James F X / Cross, Nathan M

    Journal of digital imaging

    2020  Volume 33, Issue 5, Page(s) 1280–1291

    Abstract: Manufacturing technologies continue to be developed and utilized in medical prototyping, simulations, and imaging phantom production. For radiologic image-guided simulation and instruction, models should ideally have similar imaging characteristics and ... ...

    Abstract Manufacturing technologies continue to be developed and utilized in medical prototyping, simulations, and imaging phantom production. For radiologic image-guided simulation and instruction, models should ideally have similar imaging characteristics and physical properties to the tissues they replicate. Due to the proliferation of different printing technologies and materials, there is a diverse and broad range of approaches and materials to consider before embarking on a project. Although many printed materials' biomechanical parameters have been reported, no manufacturer includes medical imaging properties that are essential for realistic phantom production. We hypothesize that there are now ample materials available to create high-fidelity imaging anthropomorphic phantoms using 3D printing and casting of common commercially available materials. A material database of radiological, physical, manufacturing, and economic properties for 29 castable and 68 printable materials was generated from samples fabricated by the authors or obtained from the manufacturer and scanned with CT at multiple tube voltages. This is the largest study assessing multiple different parameters associated with 3D printing to date. These data are being made freely available on GitHub, thus affording medical simulation experts access to a database of relevant imaging characteristics of common printable and castable materials. Full data available at: https://github.com/nmcross/Material-Imaging-Characteristics .
    MeSH term(s) Computer Simulation ; Humans ; Phantoms, Imaging ; Printing, Three-Dimensional ; Tomography, X-Ray Computed
    Language English
    Publishing date 2020-06-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1033897-4
    ISSN 1618-727X ; 0897-1889
    ISSN (online) 1618-727X
    ISSN 0897-1889
    DOI 10.1007/s10278-020-00358-6
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  10. Article ; Online: The projection of anorectal afferents to cortex of the rat: Comparison of two methods of cortical mapping.

    Turner, Keira / Pickering, Mark / O'Connell, P Ronan / Jones, James F X

    Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society

    2019  Volume 31, Issue 12, Page(s) e13709

    Abstract: Background: The rat has served usefully as a model for fecal incontinence and exploration of the mechanism of action of sacral neuromodulation. However, there is a gap in knowledge concerning representation(s) on the primary sensory cortex of this ... ...

    Abstract Background: The rat has served usefully as a model for fecal incontinence and exploration of the mechanism of action of sacral neuromodulation. However, there is a gap in knowledge concerning representation(s) on the primary sensory cortex of this anatomical region.
    Methods: Multi-electrode array (32 channels) and intrinsic optical signal (IOS) processing were used to map cortical activation sites following anorectal electrical stimulation in the rat. A simple method for expanding a 32-electrode array to a virtual 2700 array was refined.
    Key results: The IOS method identified activation of parietal cortex following anorectal or first sacral nerve root (S1) stimulation; however, the signal was poorly localized and large spontaneous vasomotion was observed in pial vessels. In contrast, the resulting high-density maps showed two anatomically distinct cortical activation sites to anorectal stimulation.
    Conclusions & inferences: There are two distinct sites of activation on the parietal cortex following anorectal stimulation in the rat. The implications for sacral neuromodulation as a therapy for fecal incontinence are discussed.
    MeSH term(s) Afferent Pathways/anatomy & histology ; Anal Canal/innervation ; Animals ; Brain Mapping/methods ; Electric Stimulation ; Electrodes ; Evoked Potentials, Somatosensory ; Female ; Pia Mater/blood supply ; Rats/anatomy & histology ; Rats, Wistar ; Rectum/innervation ; Somatosensory Cortex/physiology ; Spinal Nerve Roots/anatomy & histology ; Spinal Nerve Roots/physiology ; Vasomotor System/anatomy & histology ; Vasomotor System/physiology
    Language English
    Publishing date 2019-08-27
    Publishing country England
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1186328-6
    ISSN 1365-2982 ; 1350-1925
    ISSN (online) 1365-2982
    ISSN 1350-1925
    DOI 10.1111/nmo.13709
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