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Unformatted text preview: , in which thin fibers are not contractile but
are moved slightly to send sensory input to brain
about the state of muscle contraction.
These SENSE what are muscles are doing -- send these sensations
to the brain and help brain coordinate BODY MOVEMENTS.
Specialized fasicle. Myoﬁbrils POORLY DEVELOPED. Sensory organ.
NOT part of contractile setup. assoc. with sensory axons!
1 muscle spindle consists of 4 muscle ﬁbers -- but don't fxn the same. don't contract. Fig. 10-14 Cardiac muscle
Fibers/cells here have central
nuclei, but they branch and have
less well-organized, but still
Contraction mechanics similar to
that of striated muscle.
intercalated discs = JUNCTIONS. Show up as dark lines under mic. Cells are not fused, but joined at
intercalated discs, faintly visible
in longitudinal sections.
No satellite cells, so no repair in
Cannot repair themselves!!! Fig. 10-1b Fig. 10-16 Intercalated discs
STRONG ADHESIONS keeping
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This document was uploaded on 02/04/2014.
- Spring '14