Simple cuboidal epi (单层立方上皮) one layer, cuboidal, hexagonal outline . spherical centrally-located nucleus Distribution: Q④ Renal tubule Thyroid some ducts of glands Function: covering and secretion7 Simple cuboidal epi. （单层立方上皮 ） ❖ one layer, cuboidal, hexagonal outline ❖ spherical centrally-located nucleus Distribution: Renal tubule Thyroid some ducts of glands Function: covering and secretion