VENOUS PRESSURE-HEAD
From NeuroRehab.wiki
SUMMARY
1. When standing, anything above the heart has negative pressure & veins tends to collapse.
2. Superior sagittal sinus may be as much as -10mmHg i.e. the pressure is 10mmHg less than that of heart.
3. Magnitude of negative pressure is proportionate to the vertical distance up.
4. Dural sinuses have rigid walls and cannot collapse the pressure in them during standing or sitting, therefore remain subatmospheric.
Reference(s)
Barrett, K.E., Barman, S.M., Brooks, H.L., X, J. and Ganong, W.F. (2019). Ganong’s review of medical physiology. 26th ed. New York: Mcgraw-Hill Education
