title: Origin of the iris sphincter muscle in chick embryo.
abstract: The origin of the iridial sphincter muscle in chick embryo was investigated by means of immunohistochemistry. Desmin immunoreactive cells are shown in the mesenchymal stroma overlying the anterior epithelial layer of the iris in 4 1/2-day chick embryos. In 9-11-day chick embryos also some cells of the posterior epithelium near the pupillary margin, and of the iridial lamella show a slighter desmin-immunoreactivity. This finding agrees with a double origin of the iridial sphincter muscle: an early mesenchymal one and a later epithelial other.
authors.affiliation: Dipartimento di Anatomia e Fisiologia Umana, Università di Torino, Italia.
authors.forename: L
authors.initials: L
authors.lastname: Sisto Daneo
authors.forename: G
authors.initials: G
authors.lastname: Corvetti
authors.forename: G
authors.initials: G
authors.lastname: Filogamo
mesh_terms: D000818:Animals; D002642:Chick Embryo; D003893:Desmin / Q000032:analysis; D007498:Iris / Q000166:cytology / Q000196:embryology*; D009801:Oculomotor Muscles / Q000166:cytology / Q000196:embryology*
chemical_list: D003893:Desmin