A furrow in the brain, either produced by clefts between the embryonic vesicles, or of such depth and structure as to involve the entire wall of the hemispheres, or to produce eminences upon the walls of the lateral ventricles.
A cleft or groove, normal or otherwise. When one occurs in the pars interarticularis, the yoke of bone connecting the right and left facets, the condition is known as spondylolysis. When discs become old, less firm and less elastic, they begin to tear and create fissures in parts of the disc, through which the nucleus can seep out and cause problems.
A fissure is a major physical division of the brain. The Lateral or Sylvian Fissure divides the Temporal and Frontal Lobes. A fissure is much deeper than a sulcus and the faces on either side of a fissure have have the same features (such as gyri and sulci) that occur on the outer surfaces of the brain.
small area where the pottery has opened slightly in a small line during firing, normal caused by some minor stressing, commonly at the neck of a jar or the base. Not uncommon on earlier pieces but does detract a little from value.