Which of the following is not a type of glial cell?

Glial cells are supporting cells in the nervous system that aid in the maintenance and function of the neurons. These cells are more abundant than neurons in the human body. 

There are different types of glial cells in the nervous system.

Astrocytes and ependymal cells are found in the central nervous system whereas Schwann cells are found in the peripheral nervous system.

Myocytes (muscle cells) are structural and functional units of muscle fibre in the muscular system and thus, are not a type of glial cell.