Neural Engineering

2007 ◽  
Vol 46 (02) ◽  
pp. 142-146 ◽  
Author(s):  
D. Durand
Keyword(s):  
Nervous System ◽  
Peripheral Nervous System ◽  
Neural Control ◽  
Neural Engineering ◽  
Cross Sectional ◽  
Flat Interface ◽  
Obstructive Sleep ◽  
Machine Interface ◽  
The Individual ◽  
High Degree

Summary Objectives : The field of neural engineering focuses on an area of research at the interface between neuroscience and engineering. The area of neural engineering was first associated with the brain machine interface but is much broader and encompasses experimental, computational, and theoretical aspects of neural interfacing, neuroelectronics, neuromechanical systems, neuroinformatics, neuroimaging, neural prostheses, artificial and biological neural circuits, neural control, neural tissue regeneration, neural signal processing, neural modelling and neuro-computation. One of the goals of neural engineering is to develop a selective interface for the peripheral nervous system. Methods : Nerve cuffs electrodes have been developed to either reshape or maintain the nerve into an elongated shape in order to increase the circumference to cross sectional ratio. It is then possible to place many electrodes around the nerve to achieve selectivity. This new cuff (flat interface nerve electrode: FINE) was applied to the hypoglossal nerve and the sciatic nerve in dogs and cats to estimate the selectivity of the interface. Results : By placing many contacts close to the axons, three different types of selectivity were achieved: 1) The FINE could generate a high degree of stimulation selectivity as estimated by the individual fascicle recording. 2) Similarly, recording selectivity was also demonstrated and blind source algorithms were applied to recover the signals. 3) Finally, by placing arrays of electrodes along the nerve, small fiber diameters could be excited before large fibers thereby reversing the recruitment order. Conclusion : Taking advantage of the fact that nerves are not round but oblong or flat allows a novel design for selective nerve interface with the peripheral nervous system. This new design has found applications in many disorders of the nervous system such as bladder incontinence, obstructive sleep apnea and stroke.

scholarly journals Novel diamond shuttle to deliver flexible bioelectronics with reduced tissue compression

2018 ◽  
Author(s):  
Kyounghwan Na ◽  
Zachariah J. Sperry ◽  
Jiaao Lu ◽  
Mihaly Vöröslakos ◽  
Saman S. Parizi ◽  
...  
Keyword(s):  
Nervous System ◽  
Dura Mater ◽  
Design Space ◽  
Three Dimensional ◽  
Neural Engineering ◽  
Cross Sectional ◽  
Vertical Support ◽  
Important Challenge ◽  
Tissue Compression

AbstractThe ability to deliver flexible biosensors through the toughest membranes of the central and peripheral nervous system is an important challenge in neuroscience and neural engineering. Bioelectronic devices implanted through dura mater and thick epineurium would ideally create minimal compression and acute damage as they reach the neurons of interest. We demonstrate that a three-dimensional diamond shuttle can be easily made with a vertical support to deliver ultra-compliant polymer microelectrodes (4.5 μm thick) in-vivo through dura mater and thick epineurium. The diamond shuttle has 54% less cross-sectional area than an equivalently stiff silicon shuttle, which we simulated will result in a 37% reduction in blood vessel damage. We also discovered that higher frequency oscillation of the shuttle (200 Hz) significantly reduced tissue compression regardless of the insertion speed, while slow speeds also independently reduced tissue compression. Insertion and recording performance are demonstrated in rat and feline models, but the large design space of these tools are suitable for research in a variety of animal models and nervous system targets.

Peripheral Nerves: Not Only Cross-sectional Area in the Era of Radiomics

2020 ◽  
Vol 24 (02) ◽  
pp. 175-180
Author(s):  
Alberto Stefano Tagliafico ◽  
Raquel Prada González ◽  
Federica Rossi ◽  
Bianca Bignotti ◽  
Carlo Martinoli
Keyword(s):  
Nervous System ◽  
Peripheral Nerve ◽  
Peripheral Nervous System ◽  
Internal Control ◽  
Peripheral Nerves ◽  
Imaging Techniques ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Musculoskeletal Radiology ◽  
Cross Sectional

AbstractThe peripheral nervous system is increasingly being investigated using medical imaging as a complement or in association with electrodiagnostics tests. The application of imaging techniques, such as ultrasound (US) and magnetic resonance imaging (MRI), allows detailed visualization of the peripheral nervous system. According to the European Society of Musculoskeletal Radiology, the use of US for nerve evaluation is strongly encouraged. In addition, the role of US is further enhanced by the wide application of US-guided techniques to diagnose or to treat peripheral nerve disorders.Standard evaluation of peripheral nerves on US usually relies on cross-sectional area evaluation with different cutoff values in the osteofibrous tunnels and outside them. In several anatomical areas, side-to-side comparison is highly recommended because it helps distinguish subtle variations by using the unaffected limb as an internal control.US is widely used to perform US-guided interventional procedures on peripheral nerves. The recent development of radiomics and machine and deep learning applied to peripheral nerves may reveal new insights beyond the capabilities of the human eye. Radiomics may have a role in expanding the diagnostic capabilities of US and MRI in the study of peripheral nerve pathology, especially when the cross-sectional area is not markedly increased.

scholarly journals Pathological and anatomical changes in the peripheral nervous system in typhus. Morgenstern (Journal of Psychol., Neur. and Psychiatry, 1922)

2021 ◽  
Vol 19 (1) ◽  
pp. 92-92
Author(s):  
M. Weinberg
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Peripheral Nervous System ◽  
Anatomical Changes ◽  
The Central Nervous System ◽  
The Individual

The author found that in typhus there is, and with regard to the severity of the lesions, a parallelism between the central nervous system and the peripheral. There is no such correspondence between the individual nerves.

scholarly journals Analysis of diagnostic and tactical errors in the management of patients with traumatic limb neuropathies

2019 ◽  
Vol 21 (2) ◽  
pp. 204-208
Author(s):  
I V Litvinenko ◽  
S A Zhivolupov ◽  
A R Bulatov ◽  
E E Kuzina ◽  
N A Rashidov ◽  
...  
Keyword(s):  
Nervous System ◽  
Medical Care ◽  
Peripheral Nervous System ◽  
Early Period ◽  
High Tech ◽  
Extreme Sports ◽  
Upper And Lower Extremities ◽  
Causes Of Errors ◽  
Rational Therapy ◽  
High Degree

Diagnostic and tactical errors in the management of patients with traumatic neuropathies of the limbs are considered. Attention is drawn to the problem of treatment of traumatic lesions of the peripheral nerves and the organization of medical care in modern conditions for patients with this pathology. The paper describes the difficulties encountered in the differential diagnosis and interpretation of the clinical picture of peripheral nervous system damage, as well as the possibilities of neurophysiological and neuroimaging methods of diagnosis, describes the most common variants of innervation. The most common traumatic neuropathies after medical interventions are presented. It is established that a high degree of mechanization of production, an increase in the number of road accidents, growing household injuries and the mass introduction into everyday life of extreme sports lead to an increase in injuries of the peripheral nervous system. The article pays special attention to the organization of medical care for patients in hospital conditions, as well as the main subjective and objective causes of errors in practitioners during topical diagnosis and treatment of nerve injuries. Attention is drawn to the fact that in order to provide modern high-tech medical care for damage to the nerves of the upper and lower extremities, specialists of surgical and neurological profile need to know the architectonics of the peripheral nervous system and the basic laws of degenerative-regenerative processes in damage to the nerves and plexuses. Rational therapy of victims of this profile should be planned and implemented in the early period of traumatic disease.

scholarly journals Plasma Homocysteine and Autonomic Nervous Dysfunction: Association and Clinical Relevance in OSAS

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Lei Liu ◽  
Qiansheng Wu ◽  
Hong Yan ◽  
Xilong Zheng ◽  
Qiang Zhou
Keyword(s):  
Nervous System ◽  
Autonomic Nervous System ◽  
Clinical Relevance ◽  
Sleep Apnea Syndrome ◽  
Plasma Homocysteine ◽  
Elevated Plasma ◽  
Cross Sectional ◽  
Autonomic Nervous ◽  
Obstructive Sleep ◽  
Echocardiographic Parameters

Objective. Elevated plasma homocysteine (Hcy) is an independent risk factor for cardiovascular diseases, but the precise mechanism of Hcy in cardiovascular disease remains elusive. This study is aimed at evaluating the association between Hcy levels and autonomic nervous system and at investigating their clinical relevance in obstructive sleep apnea syndrome (OSAS). Methods. A total of 191 subjects with OSAS were enrolled for this cross-sectional study. Heart rate variability (HRV) represents the status of the autonomic nervous system and is a well-known index that allows studying the autonomic modulation. HRV and polysomnography parameters were collected based on Holter monitors and polysomnography system. The software computed all the basic HRV parameters including SDANN, SDNN and pNN50. Correlation analyses between Hcy and HRV parameters and echocardiographic parameters were performed. Results. Compared with the mild-moderate OSAS group, the prevalence of male and smoking and Hcy levels were considerably higher in the severe OSAS group (P=0.01, P=0.02, and P=0.01, respectively). Also, there were significant linear relationships between Hcy quartiles with the proportion of severe OSAS (P=0.01 for the trend). Interesting, there is a negative linear correlation between SDANN and Hcy quartiles (P=0.02 for the trend). Spearman’s correlation analysis showed a significant negative correlation between SDANN and Hcy levels (r=−0.17, P=0.02). Interestingly, the relationship of it remains significant after adjustment for clinical covariates (r=−0.15, P=0.04). However, echocardiographic parameters were not significantly correlated with Hcy or HRV parameters (all P>0.05). Conclusions. Elevated plasma Hcy level is linearly correlated with cardiac autonomic nervous function disorders in patients with OSAS.

Long-term Sequelae of Pediatric Bickerstaff Brainstem Encephalitis Includes Autonomic and Sleep Dysregulation

2019 ◽  
Vol 34 (3) ◽  
pp. 153-160
Author(s):  
Jonathan D. Santoro
Keyword(s):  
Nervous System ◽  
Peripheral Nervous System ◽  
Acute Phase ◽  
Disease Process ◽  
Retrospective Chart Review ◽  
Brainstem Encephalitis ◽  
Obstructive Sleep ◽  
Multicenter Analysis ◽  
Bickerstaff Brainstem Encephalitis

Bickerstaff brainstem encephalitis is a rare, immune-mediated disorder of the brainstem and peripheral nervous system. Published knowledge of pediatric Bickerstaff brainstem encephalitis focuses on the acute phase of the disease process. This study evaluated long-term neurologic and immune sequelae of Bickerstaff brainstem encephalitis in children. A single-center retrospective chart review was performed. Clinical data, neuroimaging, polysomnograms, and serum data were reviewed. Five patients were included in this study. Four patients had no neurologic residua, and 1 patient continued to have mild bulbar dysfunction. There was neither recurrence of symptoms nor development of other neurologic or immunologic disorders at a median of 3 years after diagnosis. Review of systems was largely negative, although 2 patients endorsed symptoms consistent with mild orthostatic hypotension for 1 year after diagnosis, but these findings were not sustained. Four of 5 patients endorsed sleep dysregulation. Three patients met criteria for pediatric obstructive sleep apnea. Prognosis following pediatric Bickerstaff brainstem encephalitis is excellent although posttreatment autonomic and sleep dysregulation may reflect residua from acute phase inflammation in the peripheral nervous system and connections of the reticular activating formation of the brainstem, although this was time limited. Further prospective, multicenter, analysis is warranted.

Computer Reconstruction of the Cellular Architecture of the Daphnia Magna Optic Ganglion

1975 ◽  
Vol 33 ◽  
pp. 284-285
Author(s):  
E. R. Macagno ◽  
C. Levinthal
Keyword(s):  
Daphnia Magna ◽  
Genetic Background ◽  
Compound Eye ◽  
Synaptic Connectivity ◽  
Serial Sections ◽  
Cross Sectional ◽  
Small Crustacean ◽  
Optic Ganglion ◽  
Structural Invariance ◽  
High Degree

The optic ganglion of Daphnia Magna, a small crustacean that reproduces parthenogenetically contains about three hundred neurons: 110 neurons in the Lamina or anterior region and about 190 neurons in the Medulla or posterior region. The ganglion lies in the midplane of the organism and shows a high degree of left-right symmetry in its structures. The Lamina neurons form the first projection of the visual output from 176 retinula cells in the compound eye. In order to answer questions about structural invariance under constant genetic background, we have begun to reconstruct in detail the morphology and synaptic connectivity of various neurons in this ganglion from electron micrographs of serial sections (1). The ganglion is sectioned in a dorso-ventra1 direction so as to minimize the cross-sectional area photographed in each section. This area is about 60 μm x 120 μm, and hence most of the ganglion fit in a single 70 mm micrograph at the lowest magnification (685x) available on our Zeiss EM9-S.

The Red Neuronal Pigment in the Nervous System of the Mussel, Mytilus Edulis: Localization and Its Effect on Lateral Ciliary Activity with Spectral and Analytical Changes

1981 ◽  
Vol 39 ◽  
pp. 494-495
Author(s):  
Anthony A. Paparo ◽  
Judith A. Murphy
Keyword(s):  
Nervous System ◽  
Mytilus Edulis ◽  
Neuronal Cell ◽  
Ciliary Activity ◽  
Neuronal Cell Bodies ◽  
The Central Nervous System ◽  
Intracellular Organelles ◽  
The Common ◽  
The Individual ◽  
Cryostat Sections

The purpose of this study was to localize the red neuronal pigment in Mytilus edulis and examine its role in the control of lateral ciliary activity in the gill. The visceral ganglia (Vg) in the central nervous system show an over al red pigmentation. Most red pigments examined in squash preps and cryostat sec tions were localized in the neuronal cell bodies and proximal axon regions. Unstained cryostat sections showed highly localized patches of this pigment scattered throughout the cells in the form of dense granular masses about 5-7 um in diameter, with the individual granules ranging from 0.6-1.3 um in diame ter. Tissue stained with Gomori's method for Fe showed bright blue granular masses of about the same size and structure as previously seen in unstained cryostat sections.Thick section microanalysis (Fig.l) confirmed both the localization and presence of Fe in the nerve cell. These nerve cells of the Vg share with other pigmented photosensitive cells the common cytostructural feature of localization of absorbing molecules in intracellular organelles where they are tightly ordered in fine substructures.

Glucuronyl 3-sulfate occurs exclusively on distal unmyelinated terminals of selected sensory neurons in the peripheral nervous system

1995 ◽  
Vol 53 ◽  
pp. 958-959
Author(s):  
S.S. Spicer ◽  
B.A. Schulte
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Cerebral Cortex ◽  
Peripheral Nervous System ◽  
Sensory Neurons ◽  
Sensory Nerves ◽  
Tissue Antigens ◽  
The Central Nervous System ◽  
The Brain ◽  
Leu 7

Generation of monoclonal antibodies (MAbs) against tissue antigens has yielded several (VC1.1, HNK- 1, L2, 4F4 and anti-leu 7) which recognize the unique sugar epitope, glucuronyl 3-sulfate (Glc A3- SO4). In the central nervous system, these MAbs have demonstrated Glc A3-SO4 at the surface of neurons in the cerebral cortex, the cerebellum, the retina and other widespread regions of the brain.Here we describe the distribution of Glc A3-SO4 in the peripheral nervous system as determined by immunostaining with a MAb (VC 1.1) developed against antigen in the cat visual cortex. Outside the central nervous system, immunoreactivity was observed only in peripheral terminals of selected sensory nerves conducting transduction signals for touch, hearing, balance and taste. On the glassy membrane of the sinus hair in murine nasal skin, just deep to the ringwurt, VC 1.1 delineated an intensely stained, plaque-like area (Fig. 1). This previously unrecognized structure of the nasal vibrissae presumably serves as a tactile end organ and to our knowledge is not demonstrable by means other than its selective immunopositivity with VC1.1 and its appearance as a densely fibrillar area in H&E stained sections.

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