Multiple Choice
Which of the following is not a type of fascicle arrangement?
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10. Muscles
Fascicle Arrangements
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In skeletal muscle anatomy, what is a fascicle?
A
A single multinucleated muscle fiber surrounded by endomysium
B
A cluster of synaptic vesicles at a neuromuscular junction
C
A bundle of muscle fibers (muscle cells) surrounded by perimysium
D
A connective tissue layer that surrounds the entire muscle (epimysium)
Verified step by step guidance1
Step 1: Understand the hierarchical structure of skeletal muscle. Skeletal muscle is organized into several levels, starting from the whole muscle down to the smallest contractile units.
Step 2: Identify the connective tissue layers associated with each level. The epimysium surrounds the entire muscle, the perimysium surrounds bundles of muscle fibers, and the endomysium surrounds individual muscle fibers.
Step 3: Define a muscle fiber. A muscle fiber is a single multinucleated muscle cell, which is surrounded by endomysium.
Step 4: Define a fascicle. A fascicle is a bundle of muscle fibers grouped together and surrounded by the perimysium connective tissue layer.
Step 5: Differentiate other options. Synaptic vesicles are part of the neuromuscular junction and not related to muscle fiber grouping, and epimysium surrounds the entire muscle, not just a bundle of fibers.
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