Origin: mesenchyme
Function: spontaneous contraction and tonus of hollow and tubular organs: alimentary canal, blood vessels, genitourinary tract, respiratory tract; secretion of extracellular matrix
Origin: ectoderm
Function: contraction
Location: sweat glands, mammary glands, salivary glands, iris of the eye
Origin: mesenchyme
Function: contraction and secretion
Location: healing wounds