musculature smooth muscle SAEL:97 adult visceral muscle FBbt:00003525 Tomasz Adamusiak Muscle tissue that lacks cross striations, that is made up of elongated spindle-shaped cells having a central nucleus, and that is found in vertebrate visceral structures (as the stomach and bladder) as thin sheets performing functions not subject to conscious control by the mind and in all or most of the musculature of invertebrates other than arthropods. EV:0100378 James Malone MAT:0000303 Visceral muscle of the adult. BTO:0001260 XAO:0000175