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17 terms

Arrangement of Fascicles

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fascicles
Muscles are composed of __, but arrangement varies.
Circular (general term is Sphincters)
fascicles converge toward a single insertion tendon
Circular (sphincters)
fascicles that surround external body openings
orbicularis muscles of the mouth
example of circular/sphincter muscle
Convergent
fascicles converge toward a single insertion tendon, and the muscle is triangular or fan shaped.
pectoralis major muscle of the chest
example of of convergent fascicle muscles
Parallel
fascicles run parallel the length of the long axis of the muscle, and the muscle is strap-like
Fusiform
Parallel fascicles that are spindle-shaped muscle with an expanded belly.
Pennate
Short fascicles attach obliquely to a central tendon
Unipennate
Fascicles insert into only one side of the tendon.
Extensor Digitorum Longus
Example of pennate fasciles:
Bipennate
the fascicles insert into opposite sides of the tendon
Rectus Femoris
Example of bipennate fascicles
Multipennate
the fascicles insert from several different sides of the tendon
Deltoid
Example of multipennate fascicles
arrangement
A muscles's fascicle __ determines its range of motion and power
1) Muscle can shorten more
2) Not usually very powerful
3) Packs in the most fibers
A muscle's fascicle arrangement determines its range of motion and power.
-Longer and more nearly parallel fascicles: (1-2)
-Shorter, stocky binpennate and multipennate: (3)
-Muscles shortens little
-Very powerful