| It is interesting to speculate why most screw threads are dextral and only a relatively small number are sinistral threads. |
| Commonly there is a partitioning of sinistral and dextral criteria on alternate horizons, but horizons occur where both senses coexist. |
| The patient had open fractures of shin bones, dextral pleuropneumonia, foreign bodies in chest cavity and chest. |
| So the spiral of the operculum of a dextral snail is invariably counterclockwise, while that of a sinistral shell is the opposite. |
| The transform fault is represented by the Arakapas fault zone, and would have had a dextral offset and sinistral slip. |
| The preference for dextral threads certainly goes back to the unrecorded past. |
