Myoepithelial cells may contain alpha smooth muscle actin and can contract and expel the secretion of EXOCRINE GLANDS.The pancreas as we know is both an EXOCRINE and ENDOCRINE requiring more complex control of secretory functions.
Presence of myoepithelial cells contained by pancreas could probably result to glandular secretions surrounded by a non- refined craze.With that, pancreas require a more refined structures and mechanism for a smooth control of BOTH of its secretory functions, which could not be achieved by presence of myoepithelial cell.
Instead of myoepithelial cells, pancreas have STELLATE CELLS which by far have close similarities to myoepithelial cell with regard to their properties and some functions which includes their contractile properties.
In addition, pancreatic secretion are more achieved by enzymatic stimulation. Whereas, other glandular organs near myoepithelial cells undertake their secretory functions by effects of contraction.
(I cannot recall the exact explanation of my ANA/PHYSIO professor back surrounded by the past, but base on my "SCANTY" knowledge on physiology, I explained it on its possible gears.)
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