Lecture 5

• -striations
• -multinucleate
• -T tubules form Triads with SR

• -striations
• -single nucleus
• -intercalated discs
• -white halos (glycogen)
• -T tubules form dyads with SR
• -binucleated Purkinje fibers

• -no striations
• -mononucleate
• -no T tubules
• -no NMJ
• -spontaneous depolarizations

Layer of connective tissue which sheaths the entire muscle (dense irregular)

Sheath of connective tissue that groups muscle fibers into bundles or facsicles (dense irregular)

Connective tissue sheath that surround individual muscle cells (mostly reticular fibers)

• I band: light (isotropic) = actin filaments
• A band: dark (anisotropic) = myosin filaments
• Z disc: actin linked to z disc proteins

Invaginations of the sarcolemma that spread membrane depolarization deep into the cell

• 1. adherens junctions
• 2. desmosomes
• 3. gap junctions