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 ...
All brass instruments are long tubes with a mouthpiece on one end and a flared bell at the other. The brass instrument produces sound by the playerâs lips vibrating against the mouthpiece. The family members of the brass section, from highest pitched to lowest pitched, are the trumpet, French horn, trombone, and tuba. The percussion family is the most diverse family and contains instruments that are either struck (hit) or shaken to produce sound.