Simple Cuboidal Epithelium

Simple cuboidal epithelium is marked by a single layer of square like cells.  The nuclei can be found in the middle of the cell.  This epithelium can be found in the walls of ducts such as the kidney tubules and ducts of exocrine glands.  Its function is to secrete or to absorb.

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Kidney tubules.  Notice the single layer of cells with their nuclei in the middle.  Annotated version here.(TM: 400x, picture taken with a Zeiss Planapo 40/1.0 Oil on Sony A7ii)
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Thyroid gland showing the simple cuboidal epithelium (also known as follicular cells) that surrounds each follicle.  (TM: 400x, picture taken with a Zeiss Planapo 40/1.0 Oil on Sony A7ii)
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Simple cuboidal epithelium of kidney.  (TM: 400x, picture taken with a Zeiss Planapo 40/1.0 Oil on Sony A7ii)
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Sweat gland of the skin.  Notice the single layer of cells that form the duct.  Observe also that a few of the ducts have stratified cuboidal epithelium (more than one layer) (TM: 100x, picture taken with a Nikon Planapo 10/0.4 on Sony NEX-6)

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