title: Morphological fiber types of retractor bulbi muscle in mouse and rat.
abstract: Retractor bulbi muscles of mouse and rat were examined by light and electron microscopy. Two morphological fiber types were observed, analogous to Type I and Type II cells of skeletal musculature and comparable to fibers observed in the global region of the rectus extraocular muscles of these species.
mesh_terms: D000818:Animals; D001369:Axons / Q000648:ultrastructure; D002415:Cats; D008116:Lizards; D051379:Mice; D008928:Mitochondria / Q000648:ultrastructure; D009469:Neuromuscular Junction / Q000648:ultrastructure; D009801:Oculomotor Muscles / Q000648:ultrastructure*; D011817:Rabbits; D051381:Rats; D012519:Sarcoplasmic Reticulum / Q000648:ultrastructure