a stratum basale -structure LM: -a layer of cuboidal or low columnar cell with a large, pale N basophilic cytoplasm EM: -free ribosome -keratin filament- tonofilament -desmosome -function: mitotic activity and proliferationa. stratum basale ---structure: LM: -a layer of cuboidal or low columnar cell with a large, pale N -basophilic cytoplasm EM: -free ribosome -keratin filament- tonofilament -desmosome ---function: mitotic activity and proliferation