1 In the cytoplasm, the mitotic spindle, consisting of microtubules and other proteins, forms between the two pairs of centrioles as they migrate to opposite poles of the cell. 2  The nuclear envelope disappears at the end of prophase. 3  This signals the beginning of the substage called prometaphase.
  Percussion Family. The Timpani is struck by mallets ... any instrument that requires a percussive touch is a member of this family ...surprisingly enough, and a little â¦ known fact, the Piano is also a member of the Percussion Family ... a key must be struck to produce a tone!!5 people found this useful.he Timpani is struck by mallets ... any instrument that requires a percussive touch is a member of this family ...
The Percussion Family. All the way in the back of the orchestra, we have the percussion family, known for its loud banging and crashing. The percussion family has instruments that are struck or shaken to make their vibrations. Early orchestras didn't have much percussion and usually just had low pitched drums called timpani, or kettle drums, to accompany the melody.