Fissure filling is a treatment that improves the apparent clarity of a gemstone by removing air and replacing it with a substance that has a refractive index similar to the host material. Many different substances may be used to fill fissures: oils, resins, waxes, glass, and various polymers, to name a few.
Cerebral autoregulation is a process in mammals, which aims to maintain adequate and stable cerebral blood flow.hile most systems of the body show some degree of autoregulation, the brain is very sensitive to over-and underperfusion. Cerebral autoregulation plays an important role in maintaining an appropriate blood flow to that region.
Considering the importance of the cerebellum in motor control, it is not surprising to find that there are numerous neural pathways connecting it with the cerebral cortex, brainstem nuclei, spinal cord proprioceptive tracts, and the vestibular system.ike the cerebrum, the cerebellum is composed of cortical gray matter surrounding a large area of subcortical white matter. Similarly, the cerebellar surface is regular and grooved, forming folia (folds). Some of the grooves are particularly deep, forming fissures, which separate the cerebral mass into lobules.