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 ...
By far, the most common type of timpani used today is the pedal timpani, which allows the tension of the head to be adjusted using a pedal mechanism. Typically, the pedal is connected to the tension screws via an assembly of either cast metal or metal rods called the spider.hroughout the 19th century and much of the 20th, there were few new timpani concertos. In 1983, William Kraft, principal timpanist of the Los Angeles Philharmonic, composed his Concerto for Timpani and Orchestra, which won second prize in the Kennedy Center Friedheim Awards.