Classes of these include OEC's and ependymocytes, and they synthesize GDNF, which may be useful in the treatment of Parkinson's disease.  Discovered in 1891 by Ram? y Cajal, they are derived from ectodermal tissue with the exception of the phagocytic micro- variety.  They include the astrocytes, which remove excess potassium and play a poorly-understood role in signaling, and oligodendrocytes and Schwann cells, which myelinate central and peripheral nervous system axons,
Classes of these include OEC's and ependymocytes, and they synthesize GDNF, which may be useful in the treatment of Parkinson's disease.  Discovered in 1891 by Ram? y Cajal, they are derived from ectodermal tissue with the exception of the phagocytic micro- variety.  They include the astrocytes, which remove excess potassium and play a poorly-understood role in signaling, and oligodendrocytes and Schwann cells, which myelinate central and peripheral nervous system axons, respectively.  FTP, name these "glue" cells that comprise the bulk of the human nervous system where they work alongside neurons.
Classes of these include OEC's and ependymocytes, and they synthesize GDNF, which may be useful in the treatment of Parkinson's disease.  
glial cells (or neuroglia)