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 ...
Percussion instruments are shaken, struck or scraped to make sound. You might say they help keep the beat! The snare drum, xylophone and tambourine are all instruments in the percussion family. Percussion instruments can add fun and intensity to a performance. Imagine a mallet striking a wood block to create the sound of horse hooves, or a cymbal clashing as the orchestra reaches its loudest point!