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Muscle and Nerve tissue Skeletal muscle or Voluntary muscle Arranged in bundles of fibers. Cellular appearance: • Long fibrous cells • usually stain pink with purple nuclei • many striations • Multinucleated • Not branched, • No intercalated discs Striations Cardiac Muscle • Found in the heart • Involuntary muscle • Arranged in layers surrounding the heart • Cellular appearance: Branching fibers stain pink with purple nuclei • Striations but fewer than in skeletal muscle • Appearance of banding due to intercalated discs • Fewer nuclei than in skeletal muscle Intercalated disc Smooth Muscle: In the visceral tissues: Found around hollow organs, digestive system, arteries and veins • Involuntary muscle • Arranged in layers around perimeter of organs • Cellular appearance: No fibers, stains pink with purple nuclei • No striations, no banding • Elongated, ovoid cells. • Overlapping cells with a single nucleus Nerve Tissue • Dendrites receive input • Axons Send output • Signal is based on an electrochemical gradient maintained by active transport of sodium and potassium • There are other types of neurons than the type shown. To be discussed later. Cell Body Axon