<unk>  is a structure similar to basal<unk>  that surrounds the sarcolemma of muscle cells. It is secreted by myocytes and consists primarily of Collagen type IV,<unk> n and perlecan (heparan sulfate proteoglycan). Nerve cells, including perineurial cells and Schwann cells also have an<unk> -like protective coating. Adipocytes also have an<unk> .
External lamina
Neuromere
Episcleral layer
Neuromatrix
Glia limitans
Outer plexiform layer
Ganglion cell layer
Inner plexiform layer