Like MRI and CT scans, another test, called a myelogram, uses radiographs and requires a contrast medium to be injected into the subarachnoid space.
42.
Lumbar puncture is carried out under sterile conditions by inserting a needle into the subarachnoid space, usually between the third and fourth lumbar vertebrae.
43.
From the fourth ventricle, the fluid passes through three openings to enter the subarachnoid space these are the median aperture, and the lateral apertures.
44.
The subarachnoid space is the location of the interface between the vascular tissue and the cerebrospinal fluid and is active in the blood brain barrier.
45.
For many years after Virchow-Robin spaces were first described, it was thought that they were in free communication with the cerebrospinal fluid in the subarachnoid space.
46.
Visualization of cortical veins traversing the collection favors a widened subarachnoid space as seen in brain atrophy, whereas subdural hygromas will displace the cortex and cortical veins.
47.
A long fine spinal needle ( 25G ) is then introduced via the lumen of the epidural needle and through the dura mater, into the subarachnoid space.
48.
The CSF occupies the subarachnoid space ( between the arachnoid mater and the pia mater ) and the ventricular system around and inside the brain and spinal cord.
49.
It has been observed that obstruction of the cerebrospinal fluid spaces in the subarachnoid space can result in syrinx formation, and alleviation of the obstruction may improve symptoms.
50.
There is also a connection from the subarachnoid space to the bony labyrinth of the inner ear via the perilymphatic duct where the perilymph is continuous with the cerebrospinal fluid.
