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. The timpani, also known as kettledrums, are constructed of a large copper bowl with a drumhead made of animal skin stretched across the top. They are struck with felt tipped wooden sticks. Timpani were the first drums to be used in the orchestra, joining the ensemble over 300 years ago.nare drum. The snare drum has a crisp untuned sound that is used by the military and in marching bands. Sometimes called the side drum, the snare drum has two heads made of skin stretched over a hollow metal frame. The top head is struck with wooden drumsticks, and is called the batter-head.