Fig. 4From: Fine structure of the intercalated disc and cardiac junctions in the black widow spider Latrodectus mactansTransmission electron micrographs of the cardiac muscle cell and its neural innervation in the spider L. mactans. a, b: Sarcolemma (Sm) is connected with the basement membrane which surrounds connective tissues (Ct), or to other muscle cells creating a very strong fiber. c, d: Cardiac muscle fiber is innervated by neural bundles containing axons (Ax) from neurons of the cardiac ganglion. d: Neuronal axons are connected to the individual muscle fibers at the neuromuscular junction. Mf: myofbril, Mi: mitochondria, Nu: nucleus, Tt: T-tubules. All scale bar indicates 2 μmBack to article page