Chapter 10 - Favorite Muscles Skeletal Muscles Functional Groups Prime movers 1 Provide the major force for producing a specific movement Antagonists 3

Chapter 10 - Favorite Muscles Skeletal Muscles Functional...

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Favorite Muscles
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Skeletal Muscles: Functional Groups1.Prime moversProvide the major force for producing a specific movement3.AntagonistsOppose or reverse a particular movement
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Skeletal Muscles: Functional Groups3.SynergistsAdd force to a movementReduce undesirable or unnecessary movement5.FixatorsSynergists that immobilize a bone or muscle’s origin
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Naming Skeletal MusclesLocation—bone or body region associated with the muscleShape—e.g., deltoid muscle (deltoid= triangle) Relative size—e.g., maximus (largest), minimus (smallest), longus (long)Direction of fibers or fascicles—e.g., rectus (fibers run straight), transversus, and oblique (fibers run at angles to an imaginary defined axis)
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Naming Skeletal MusclesNumber of origins—e.g., biceps (2 origins) and triceps (3 origins)Location of attachments—named according to point of origin or insertion Action—e.g., flexor or extensor, muscles that flex or extend, respectively
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Muscle Mechanics: Arrangement of FasciclesCircularFascicles arranged in concentric rings (e.g., orbicularis oris)ConvergentFascicles converge toward a single tendon insertion (e.g., pectoralis major)
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Muscle Mechanics: Arrangement of FasciclesParallelFascicles parallel to the long axis of a straplike muscle (e.g., sartorius)FusiformSpindle-shaped muscles with parallel fibers (e.g., biceps brachii)PennateShort fascicles attach obliquely to a central tendon running the length of the muscle (e.g., rectus femoris)
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Figure 10.1(a)(b)(e)(d)(g)(f)(c)Circular(orbicularis oris)(b) Convergent(pectoralis major)(c) Parallel(sartorius)
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  • Spring '09
  • Jones
  • Extensor Digitorum Longus, Muscles of the upper limb, Extensor Carpi, Extensor Digitorum, Extensor digitorum brevis

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