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 ...
Timpani Details. The round head of a timpani can vibrate in a large number of vibrational modes. The fundamental is not generally used in music; it is highly damped and does not produce as pleasing a sound as some other modes.he round head of a timpani can vibrate in a large number of vibrational modes. The fundamental is not generally used in music; it is highly damped and does not produce as pleasing a sound as some other modes.