Nigel,NZer1 wrote:http://www.biomedsearch.com/attachments ... 54-5-7.pdf
Heavy reading! It would be good if this thought had been expanded to problems when the outflows of the brain, veins are malformed.
Hope you're having as nicer weather as we are, very hot, no wind and its the weekend.
Regards Nigel
Edited. After thought, the skull size and design differences between male and female correlate with the prevalence of MS. Interesting!!!!!!!!!
Here are a few pearls from the above paper on CSF researh regarding hydrocephalus and Chiari malformations:
Hydrocephalus progresses because of venous insufficiency...hindbrain herniation (Chiari malformation) is caused by abnormal craniocervical (venous and CSF) pressure gradient...Chiari malformations damage(s) neural tissue by ischemic (decreased arterial blood flow) and mechanical forces .. Veins situated inbetween the dura and surrounding bone are highly compressible and capable of large volume fluctuations. Such veins are prominent in the spine (vertebral venous plexus) ... The potential range in pressure is arguably greatest in the spine because of the capacity and compressibility of the intraspinal venous plexus vessels ... It is proposed that hydrocephalus is an edema (poor drainage) of the central nervous system. Rapidly developing venous insufficiency leads to an increase in parenchyma (brain tissue) water content ... vertebral deformity ... may reduce space and CSF flow ... Vertebral injury causing abnormal function of the spinal venous plexus may impair spinal venous drainage ...
In this regard, you have veretebral deformities that affect shape and dimensions of the the spinal canal. They also press on the thecal sac of the cord which contains the vertebral veins. The vertebral veins are small so that small increases in pressure on the thecal sac have a large impact on the veins, which can further affect arterial blood flow resulting in chronic ischemia. Ischemia is on of the chief suspects in nerve and myelin degeneration.