Muscle Review 11

Muscle Review 11 - 7 8 Neuromuscular Spindle Neuromuscular...

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Macro-, Micro- and Molecular Organization of Skeletal Muscle Muscle cells or fibers form a long multinucleated syncytium grouped into bundles surrounded by connective tissue sheathes extending from the site of origin to their insertion (voluntary striated muscle)
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Skeletal Muscle
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Skeletal Muscle Longitudinal section Cross Section
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Skeletal Muscle
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Skeletal Muslce
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10 = myofiber (muscle cell); 11 = nucleus; 12 = endomycium; 13 = myofibrils; Skeletal Muscle
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Skeletal Muscle 1 = sarcomere; 2 = I band; 3 = A band; 4 = Z disk; 5 = sarcoplasm; 6 = mitochondria; 10 = triad
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Motor Unit of Skeletal Muscle
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1 = nerve; 2 = striations; 3 = axons; 4 = neuromuscular junction or motor end plates; 5 = terminal component of an axon/ motor end plates; 6 = mitochondria; 7 = acetycholine-containing synaptic vesicles; 9 = junctional folds/secondary synaptic cleft; 10 = primary synaptic cleft
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Similar to one of your slides
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1 = muscle spindle; 2 = capsule; 3 = intrafusal fibers; 4 = connective tissue binding the intrafusal fibers together; 7 = periaxial space; 8 = perimycium
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Unformatted text preview: 7 8 Neuromuscular Spindle Neuromuscular Spindle Cardiac Muscle Cardiac muscle fibers show (1) faint striations (2) central nuclei within clear areas that contain organelles (3) fiber branching (4) intercalated discs (5) frequent nuclei in cross-section Cardiac Muscle Cardiac Muscle Cardiac Muscle 2 = myofibrils; 3 = Z disc; 4 = mitochondria; 5 = T-tubules; 10 & 11 = intercalated disks 10 = gap junctions 11 = desmosomes Purkinji Fibers (not cells) Smooth Muscle Smooth Muscle Smooth Muscle Smooth Muscle: Note that there are no cytoplasmic spaces around the nuclei Many vessels have smooth muscle Smooth Muscle in the wall of a tubular organ 1&4 = longitudinal smooth muscle; 2 = cross sectional smooth muscle; 3&5 = dense irregular CCT Smooth Muscle in the Esophagus 7 = longitudinal smooth muscle; 8= cross sectional smooth muscle; 9 = oblique smooth muscle; 11 = smooth muscle bundles Overview of Muscle...
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This note was uploaded on 10/07/2011 for the course VIBS 343 taught by Professor Staff during the Spring '08 term at Texas A&M.

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Muscle Review 11 - 7 8 Neuromuscular Spindle Neuromuscular...

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