Descending

[Sarah]

1. To move from a higher to a lower place; come or go down.
2. To slope, extend, or incline downward.
3. To come from an ancestor or ancestry.
4. To come down from a source; derive.
5. To pass by inheritance.
6. To lower oneself.
7. To proceed or progress downward, as in rank, pitch, or scale.
8. To arrive or attack in a sudden or an overwhelming manner.

[Dave Paprocki]

used to refer to a body part that is in a downward direction: