Skeletal_Muscle_Fall_2010

Skeletal_Muscle_Fall_2010 - Skeletal Muscle I Sireesha...

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Skeletal Muscle I Sireesha Teegala
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Parts of a Skeletal Muscle Origin attachment to stationary end of muscle Belly thicker, middle region of muscle Insertion attachment to mobile end of muscle
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Coordinated Muscle Actions Prime mover or agonist produces most of force Synergist aids the prime mover stabilizes the nearby joint modifies the direction of movement Antagonist opposes the prime mover preventing excessive movement and injury Fixator prevents movement of bone
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Skeletal Muscle Shapes 1 Fusiform muscles thick in middle and tapered at ends biceps brachii m. Parallel muscles have parallel fascicles rectus abdominis m. Convergent muscle broad at origin and tapering to a narrower insertion Pennate muscles fascicles insert obliquely on a tendon unipennate, bipennate or multipennate palmar interosseus, rectus femoris and deltoid Circular muscles ring around body opening orbicularis oculi
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Naming Muscles Direction of muscle fibers Relative size of muscle Location of muscle Number of origins Location of origin and insertion Shape of muscle Action of muscle
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Muscles of Facial Expression Small muscles that insert into the dermis Innervated by facial nerve (CN VII) Paralysis causes face to sag Found in scalp, forehead, around the eyes, nose and mouth, and in the neck
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Muscles in Facial Expression 1 Frontalis- o. galea aponeurotica i. skin of eyebrows f. raises eyebrows
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Muscles in Facial Expression 1 Orbicularis oculi- Frontal & maxillary bones i. circles orbit f. closes eyes
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Muscles in Facial Expression 1 Levator labii superioris- o. zygomatic bone/ orbital margin of maxilla i. skin of upper lib f. raises upper lip
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Muscles in Facial Expression 1 Zygomaticus major & minor- o. zygomatic bone i. corner of mouth f. raises corner of mouth [ ]
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Skeletal_Muscle_Fall_2010 - Skeletal Muscle I Sireesha...

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