Hemorrhoids are classified into two general categories: internal and external. Internal hemorrhoids lie far enough inside the rectum that you can't see or feel them. They don't usually hurt because there are few pain-sensing nerves in the rectum. Bleeding may be the only sign that they are there. Sometimes internal hemorrhoids prolapse, or enlarge and protrude outside the anal sphincter.
Cerebrospinal fluid (CSF) collection is a test to look at the fluid that surrounds the brain and spinal cord. CSF acts as a cushion, protecting the brain and spine from injury. The fluid is normally clear. The test is also used to measure pressure in the spinal fluid. See also: CSF culture.
Split and merge into it. Answered by The Community. Making the world better, one answer at a time. The fluid that circulates through the ventricles of the brain, the central canal of the spinal cord and the subarachnoid spaces is cerebrospinal fluid (CSF).CSF is an ultrafiltrate of blood plasma, produced in the choroid plexus in the ventricles and basal cisterns.nswered by The Community. Making the world better, one answer at a time. The fluid that circulates through the ventricles of the brain, the central canal of the spinal cord and the subarachnoid spaces is cerebrospinal fluid (CSF).