The meningeal arrangement of the avian lumbosacral spinal cord

1987 ◽  
Vol 65 (4) ◽  
pp. 920-927 ◽  
Author(s):  
Iñigo Azcoitia ◽  
Benjamin Fernández ◽  
Agustín Fernandez
Keyword(s):  
Spinal Cord ◽  
Cerebrospinal Fluid ◽  
Lumbosacral Spinal Cord ◽  
Fluid Compartment ◽  
Trabecular Network ◽  
Glycogen Body

The meningeal arrangement of the lumbosacral cord of Gallus is comparable to that of mammals. The meninges are formed by three lamellae: inner, intermediate, and outer. The arachnoid space, between the outer and intermediate lamellae, is wide and filled with a trabecular network, except in the region of the glycogen body and lobes of Lachi. This region is invaded by the glycogen body cells which also disrupt the inner and intermediate lamellae. A similarity between this region and the cerebellomedullary cistern of mammals is postulated, and the meaning of the presence of glycogen in the outer cerebrospinal fluid compartment is also discussed.

Pressure Gradients Affecting the Labyrinth during Hypobaric Pressure

1997 ◽  
Vol 106 (6) ◽  
pp. 495-502 ◽  
Author(s):  
Konrád S. Konrádsson ◽  
Björn I. R. Carlborg ◽  
Joseph C. Farmer
Keyword(s):  
Cerebrospinal Fluid ◽  
Eustachian Tube ◽  
Ambient Pressure ◽  
Pressure Gradients ◽  
Cochlear Aqueduct ◽  
Fluid Compartment ◽  
Large Pressure ◽  
Fluid Compartments ◽  
Pressure Changes ◽  
Considerable Pressure

Hypobaric effects on the perilymph pressure were investigated in 18 cats. The perilymph, tympanic cavity, cerebrospinal fluid, and systemic and ambient pressure changes were continuously recorded relative to the atmospheric pressure. The pressure equilibration of the eustachian tube and the cochlear aqueduct was studied, as well as the effects of blocking these channels. During ascent, the physiologic opening of the eustachian tube reduced the pressure gradients across the tympanic membrane. The patent cochlear aqueduct equilibrated perilymph pressure to cerebrospinal fluid compartment levels with a considerable pressure gradient across the oval and round windows. With the aqueduct blocked, the pressure decrease within the labyrinth and tympanic cavities was limited, resulting in large pressure gradients toward the chamber and the cerebrospinal fluid compartments, respectively. We conclude that closed cavities with limited pressure release capacities are the cause of the pressure gradients. The strain exerted by these pressure gradients is potentially harmful to the ear.

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.

Effect of altering cerebrospinal fluid pressure on spinal cord blood flow

1994 ◽  
Vol 58 (1) ◽  
pp. 112-115 ◽  
Author(s):  
Shigeru Kazama ◽  
Yoshihiko Masaki ◽  
Shigeyoshi Maruyama ◽  
Akira Ishihara
Keyword(s):  
Spinal Cord ◽  
Blood Flow ◽  
Cerebrospinal Fluid ◽  
Cord Blood ◽  
Fluid Pressure ◽  
Cerebrospinal Fluid Pressure ◽  
Spinal Cord Blood Flow

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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