Chapter 11 Muscles of the Body

Chapter 11 Muscles of the Body - many fibers per unit area,...

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1 Muscles of the Body Chapter 11 Lever Systems The operation of skeletal muscles involves leverage. Arrangement of fascicles: muscle architecture Parallel – Fascicles run parallel to the long axis – sartorius, rectus abdominis Arrangment of fascicles: muscle architecture convergent – Wide origin and narrow insertion – force concentrated on a single point, stronger than parallel – pectoralis major Arrangment of fascicles: muscle architecture Pennate – Fascicles attach at an angle to a tendon that runs the length of the muscle
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Unformatted text preview: many fibers per unit area, strong, tire quickly unipennate, bipennate, multipennate Arrangment of fascicles: muscle architecture Circular (sphincteral) concentric arrangement around orifice orbicularis oris, orbicularis oculi Sphincteral sphincter Muscle Groups Agonist Synergist Antagonist Stabilizers & neutralizers fixators Naming of Muscles Naming of Muscles 1 2 3 4 5 6 7 8 9...
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