Physiological studies of any system benefit from the knowledge of the dynamic variations of the structures studied. This is particularly important when the expected response is small in magnitude or inconstant of reproduction. Changes in the vascular caliber of pial vessels have been studied extensively in lower forms.14,15,18,21,27 During the course of 33 craniotomies for brain tumor, intracerebral hematoma, 8th nerve section, and 2 negative explorations, an extensive study of the human pial circulation with cinephotomicrography was undertaken. Similar studies of larger vessels have been carried out in the human and in the Rhesus monkey.
The cinephotomicrographic study was carried out by a well-established method.18 Continuous records were obtained at a magnification of 4.2 X on 16 mm. Kodachrome Daylight film. Illumination was delivered to the brain surface through an Ultrapak attachment. An objective dipping cone, sterilized by immersion, was used in all instances. It was adjusted
GURDJIAN ES, THOMAS LM. Human Pial Circulation. Arch Neurol. 1961;5(1):111–118. doi:10.1001/archneur.1961.00450130113013
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