title: Aggregates of particles on the plasmalemma of striated muscle from a spider.
abstract: Aggregates of large intramembranous particles are described in the surface membrane of muscle fibers of a spider. The particles are continuous with extensions into the extracellular space, forming large complexes. No intramembranous particles are visible at sites of Z line attachment to the plasma membrane.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000648:ultrastructure*; D005614:Freeze Fracturing; D008854:Microscopy, Electron; D009132:Muscles / Q000648:ultrastructure*; D013112:Spiders / Q000648:ultrastructure*