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 ...
More Stories. Ah, the timpani. No orchestral percussion section is complete without them! And here at the Baltimore Symphony Orchestra, we have one of the most killer timpanists in the biz, James Wyman (otherwise known as the Tattooed Timpanist), who is about to drop some knowledge on you about these drums with the funny name.