Term Name:	smooth muscle cell of sphincter of pupil
Synonyms:	smooth muscle fiber of sphincter of pupil, smooth muscle fibre of sphincter of pupil
Definition:	A circular smooth muscle cell of the iris, innervated by the ciliary nerves (parasympathetic), and acting to contract the pupil. This muscle cell derives from neuroectoderm. This smooth muscle cell results from transformation of epithelial cells to smooth muscle cells.
Ontology:	Cell Ontology [CL:0002243]