Spinal Micturition Reflex Mediated by Afferents in the Deep Perineal Nerve

2005 ◽  
Vol 93 (5) ◽  
pp. 2688-2697 ◽  
Author(s):  
Joseph W. Boggs ◽  
Brian J. Wenzel ◽  
Kenneth J. Gustafson ◽  
Warren M. Grill
Keyword(s):  
Spinal Cord ◽  
Bladder Pressure ◽  
Detrusor Muscle ◽  
Urethral Sphincter ◽  
Lumbosacral Spinal Cord ◽  
Sensory Pathways ◽  
Tension Properties ◽  
Before And After ◽  
Spinal Circuit ◽  
40 Hz

Reflexes mediated by urethral sensory pathways are integral to urinary function. This study investigated the changes in bladder pressure and urethral sphincter activity resulting from electrical stimulation of afferents in the deep perineal nerve (DP), which innervates the urethra and surrounding muscles, before and after acute spinal cord transection (SCT) in cats anesthetized with α-chloralose monitored by blood pressure and heart rate. DP stimulation elicited bladder contractions before and after SCT but only if the bladder contained a sufficient volume of fluid (78% of the volume needed to cause distention-evoked reflex contractions). The volume dependency was mediated by a neuronal mechanism in the lumbosacral spinal cord and was not attributable to length-tension properties of the detrusor muscle. Stimulation at 2–40 Hz initiated bladder contractions, but 20–40 Hz was more effective than lower frequencies in evoking and sustaining bladder contractions for the duration of the stimulus train. Decreases in urethral sphincter activity occurred during sustained bladder contractions evoked by 20- to 40-Hz stimulation before and within 16 h after SCT. After SCT, average bladder pressure increases evoked by DP stimulation were smaller than those evoked before SCT, but in some animals, bladder pressures elicited by DP stimulation continued to increase as time after SCT increased and reached pretransection amplitudes at 8–16 h posttransection. These data confirm the presence of a spinal circuit that can mediate coordinated bladder–sphincter responses and show that afferents from the DP can activate this circuit under appropriate conditions.

scholarly journals Role of spinal α1-adrenoceptor subtypes in the bladder reflex in anesthetized rats

2001 ◽  
Vol 280 (5) ◽  
pp. R1414-R1419 ◽  
Author(s):  
Mitsuharu Yoshiyama ◽  
William C. De Groat
Keyword(s):  
Spinal Cord ◽  
Afferent Input ◽  
Bladder Pressure ◽  
Contraction Amplitude ◽  
Lumbosacral Spinal Cord ◽  
Anesthetized Rats ◽  
Bladder Contraction ◽  
Transurethral Catheter ◽  
Bladder Activity

The contribution of different subtypes of α1-adrenoceptors in the lumbosacral spinal cord to the control of the urinary bladder was examined in urethane-anesthetized rats. Bladder pressure was recorded via a transurethral catheter under isovolumetric conditions. Drugs were administered intrathecally at the L6-S1segmental level of spinal cord. RS-100329 (an α1A-antagonist) in doses of 25, 50, and 100 nmol significantly decreased bladder-contraction amplitude by 38%, 52%, and 95%, respectively, whereas (+)-cyclazosin (an α1B-antagonist) significantly decreased bladder-contraction amplitude (48% reduction) only in a 50-nmol but not a 100-nmol dose. Fifty nanomoles of RS-100329 and (+)-cyclazosin increased bladder-contraction frequency by 54% and 44%, respectively. BMY7378 (an α1D-antagonist), in doses of 25, 50, and 100 nmol, did not change bladder activity. These studies suggest that reflex-bladder activity is modulated by two types of spinal α1-adrenergic mechanisms: 1) α1A- or α1B-inhibitory control of the frequency of voiding reflexes presumably mediated by an alteration in the processing of bladder afferent input and 2) α1A-facilitatory modulation of the descending efferent limb of the micturition-reflex pathway. Spinal α1D-adrenoceptors do not appear to have a significant role at either site.

scholarly journals Gamma entrainment frequency affects mood, memory and cognition: an exploratory pilot study

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Ryan L. S. Sharpe ◽  
Mufti Mahmud ◽  
M. Shamim Kaiser ◽  
Jianhui Chen
Keyword(s):  
Pilot Study ◽  
Correlation Analysis ◽  
Negative Correlation ◽  
Cognitive Abilities ◽  
Statistical Significance ◽  
Assessment Scores ◽  
Frequency Group ◽  
Before And After ◽  
Mood Score ◽  
40 Hz

AbstractHere we provide evidence with an exploratory pilot study that through the use of a Gamma 40 Hz entrainment frequency, mood, memory and cognition can be improved with respect to a 9-participant cohort. Participants constituted towards three binaural entrainment frequency groups: the 40 Hz, 25 Hz and 100 Hz. Participants attended a total of eight entrainment frequency sessions twice over the duration of a 4-week period. Additionally, participants were assessed based on their cognitive abilities, mood as well as memory, where the cognitive and memory assessments occurred before and after a 5-min binaural beat stimulation. The mood assessment scores were collected from sessions 1, 4 and 8, respectively. With respect to the Gamma 40 Hz entrainment frequency population, we observed a mean improvement in cognitive scores, elevating from 75% average to 85% average upon conclusion of the experimentation at weak statistical significance ($$\alpha$$ α = 0.10, p = 0.076). Similarly, memory score improvements at a greater significance ($$\alpha$$ α = 0.05, p = 0.0027) were noted, elevating from an average of 87% to 95%. In pertinence to the mood scores, a negative correlation across all populations were noted, inferring an overall increase in mood due to lower scores correlating with elevated mood. Finally, correlation analysis revealed a stronger R$$^2$$ 2 value (0.9838) within the 40 Hz group between sessions as well as mood score when compared across the entire frequency group cohort.

scholarly journals Rostrocaudal Distribution of the C-Fos-Immunopositive Spinal Network Defined by Muscle Activity during Locomotion

2021 ◽  
Vol 11 (1) ◽  
pp. 69
Author(s):  
Natalia Merkulyeva ◽  
Vsevolod Lyakhovetskii ◽  
Aleksandr Veshchitskii ◽  
Oleg Gorskii ◽  
Pavel Musienko
Keyword(s):  
Spinal Cord ◽  
Locomotor Activity ◽  
Control Systems ◽  
Muscle Activity ◽  
Knee Extensors ◽  
Emg Activity ◽  
Lumbosacral Spinal Cord ◽  
Adductor Muscles ◽  
Spinal Network ◽  
Hip Flexor

The optimization of multisystem neurorehabilitation protocols including electrical spinal cord stimulation and multi-directional tasks training require understanding of underlying circuits mechanisms and distribution of the neuronal network over the spinal cord. In this study we compared the locomotor activity during forward and backward stepping in eighteen adult decerebrated cats. Interneuronal spinal networks responsible for forward and backward stepping were visualized using the C-Fos technique. A bi-modal rostrocaudal distribution of C-Fos-immunopositive neurons over the lumbosacral spinal cord (peaks in the L4/L5 and L6/S1 segments) was revealed. These patterns were compared with motoneuronal pools using Vanderhorst and Holstege scheme; the location of the first peak was correspondent to the motoneurons of the hip flexors and knee extensors, an inter-peak drop was presumably attributed to the motoneurons controlling the adductor muscles. Both were better expressed in cats stepping forward and in parallel, electromyographic (EMG) activity of the hip flexor and knee extensors was higher, while EMG activity of the adductor was lower, during this locomotor mode. On the basis of the present data, which showed greater activity of the adductor muscles and the attributed interneuronal spinal network during backward stepping and according with data about greater demands on postural control systems during backward locomotion, we suppose that the locomotor networks for movements in opposite directions are at least partially different.

The effect of the Standard American Diet on Iba-1 immunoreactivity in the spinal cord before and after peripheral inflammatory injury in rats

2021 ◽  
Vol 18 ◽  
pp. 100278
Author(s):  
Larissa J. Strath ◽  
Stacie K. Totsch ◽  
Tammie L. Quinn ◽  
Marissa Menard ◽  
Alan Philip George ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Inflammatory Injury ◽  
Before And After

Particle Size of Drug Nanocarriers Defines the Fate of Spinal Cord Injury’s Recovery

2021 ◽  
Author(s):  
Delaram Poormoghadam ◽  
Bita Rasoulian Shiadeh ◽  
Fereshte Azedi ◽  
Hani Tavakol ◽  
Seyed Mahdi Rezayat ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Cell Membrane ◽  
Muscular Atrophy ◽  
Muscle Tone ◽  
Membrane Damage ◽  
Definitive Treatment ◽  
Detrusor Muscle ◽  
Cell Membrane Damage ◽  
Fty 720 ◽  
Cord Injury

Abstract Spinal cord injury (SCI) is a debilitating condition for which no definitive treatment has yet been identified. Noteworthy, it influences other tissues through inflammatory reactions and metabolic disturbance. Therefore, fingolimod (FTY-720) as an FDA-approved inflammatory modulator would be promising. In the present study, nanocarriers at two distinct monodisperse particle sizes of 60 (nF60) and 190 (nF190) nm were prepared.The neural stem cell (NSC) viability and LDH release were studied in the face of the nanocarriers and free FTY-720. Results indicated that nanocarriers and free FTY-720 enhanced NSC viability than the control group.However, nF190 significantly induced less cell membrane damage than nF60. Nanocarriers and free FTY-720 enhanced motor neuron recovery in SCI rats, while body weight and return to bladder reflux by nF190 was significantly higher than nF60 groups. Return to bladder reflux might be due to the role of FTY-720 in regulation of detrusor muscle tone and preservation of the integrity of vessels by acting on endothelial cells. Moreover,nF190 gained higher soleus muscle weight than the free drugs;probably decreasing pro-inflammatory cytokines in soleus diminish muscular atrophy in SCI rats.To sum thing up, larger nanacarrirs with less cell membrane damage seems to be more efficient than smaller ones to manage SCI.

Acute Transverse Myelitis Associated with COVID-19 vaccine: A Case Report

2021 ◽  
Vol 12 (3) ◽  
pp. 2083-2087
Author(s):  
Ali Alshararni
Keyword(s):  
Spinal Cord ◽  
Case Report ◽  
Acute Inflammation ◽  
Transverse Myelitis ◽  
Preventive Measure ◽  
Mri Findings ◽  
Dorsal Spinal Cord ◽  
Lumbosacral Spinal Cord ◽  
Acute Transverse Myelitis ◽  
Magnetic Resonance Imaging Mri

The case report demonstrates the issue of Khalid Ali, who is a citizen of Yamen, explicitly living in Saudi Arabia. He is 38 years, weighs 82kgs, and of 162 cm in height. He is a sales professional and married with two kids. Khalid Ali has been living healthy until two years ago when he started experiencing pains in his lower extremities accompanied by numbness. He was treated, and everything went back to normal until soon when the case came back after the administration of the Pfizer vaccine as a preventive measure for COVID-19 disease. The consequence of the administration of the Pfizer vaccine resulted in severe pain and weaknesses in his legs and severe headache on the second day, which resulted in him being put on an ICU after 48 hours since he was almost paralyzed. A series of tests were conducted on him, including magnetic resonance imaging (MRI), hematology, and biochemistry which involved Cerebrospinal Fluid (CSF) protein test. MRI findings were significant since they indicated acute inflammation on the spine observed on the dorsal spinal cord with contrast and lumbosacral spinal cord. All the hematology tests turned out to be expected. Biochemistry conducted tests were similarly standard except for CSF protein which was highly abnormal. The combination of the high abnormal CSF protein test and acute inflammation of the spine observed from the MRI findings were confirmed evidence of acute transverse myelitis as a result of the administration of the Pfizer vaccine.

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