Terminology. Many authors prefer the term annular fissure over annular tear, as the latter seems to imply acute injury 1,2. In the setting of severe trauma with disruption of the disc, then the term disc rupture should be used. The term annular gap (referring to a relatively wide annular fissure) is non-standard 2.any authors prefer the term annular fissure over annular tear, as the latter seems to imply acute injury 1,2. In the setting of severe trauma with disruption of the disc, then the term disc rupture should be used.
Sedimentary rocks tend to be more porous than igneous rocks because there is more open space between the individual sediment grains than between the minerals in a crystallized â¦ rock.Porosity of rocks  Consolidated rocks (e.g. sandstone, shale, granite or limestone) potentially have more complex dual porosities, as compared with alluvial sediment.
Best Answer: Permeability is a function of the amount of porespace in the rock and how interconnected the pore space is: granite and other intrusive igneous rocks have very interlocking grain structure and little pore space so low permeability.n metamorphic rocks the alignment of the platy minerals serves to further destroy permeability. Of the sedimentary rocks, shale or slate is least permeable (and thus forms good seals to oil and gas reservoirs), and sandstones and limestones most permeable.