title: Sarcotubules and subsarcolemmal caveolae and their continuity with the sarcolemma in frog striated muscle.
abstract: After using tannic acid mordanting, T-tubules and subsarcolemmal caveolae show a dense staining with lead citrate, with some increase in contrast also of the sarcolemma, in frog muscle. While  a few T-tubules show direct continuity with the extracellular space, the majority open indirectly via caveolae. Caveolae lie immediately beneath the sarcolemma, mainly in a single row, and are more numerous in relation to I-bands.
mesh_terms: D000818:Animals; D001001:Anura; D005110:Extracellular Space / Q000648:ultrastructure; D006652:Histological Techniques; D047348:Hydrolyzable Tannins; D007866:Leg; D009132:Muscles / Q000648:ultrastructure*; D011894:Rana pipiens; D012508:Sarcolemma / Q000648:ultrastructure*; D012519:Sarcoplasmic Reticulum / Q000648:ultrastructure*
chemical_list: D047348:Hydrolyzable Tannins