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Introduction to Muscles
Origin: Attachment of a muscle tendon to the stationary bone. Insertion: Attachment of the other muscle tendon to the movable bone. Action: The movement that occurs at the joint due to muscle contraction.
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Origin and Insertion
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Belly
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Characteristics Used to Name Muscles
Direction of Fibers Size of Muscle Shape of Muscle Action of Muscles Number of Origins of Muscle Location of Muscle Origin and Insertion of Muscle
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Characteristics Used to Name Muscles
Direction of Muscle Fibers Rectus: Parallel to midline Transverse: Perpendicular to midline Oblique: Diagonal to midline
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Rectus: Parallel to midline
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Transverse: Perpendicular to midline
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Oblique: Diagonal to midline
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Characteristics Used to Name Muscles
Size of the Muscle: Maximus: Largest muscle in a group Minimus: Smallest muscle in a group Longus: Longest muscle in a group Brevis: Shortest muscle in a group Latissimus: Widest muscle in a group Magnus: Largest muscle in a group Major: Largest muscle in a group Minor: Smallest muscle in a group Vastus: Great or large muscle
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Maximus: Largest muscle in a group
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Minimus: Smallest muscle in a group
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Longus: Longest muscle in a group
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Brevis: Shortest muscle in a group
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Latissimus: Widest muscle in a group
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Major: Largest muscle in a group
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Minor: Smallest muscle in a group
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Vastus: Great or large muscle
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Characteristics Used to Name Muscles
Shape of Muscle Deltoid: Triangular shaped Trapezius: Trapezoid shaped Serratus: Saw-toothed muscle edge Rhomboideus: Diamond shaped Orbicularis: Circular shaped Pectinate: Comblike shaped Platys: Flat muscle Quadratus: Square shaped Gracilis: slender muscle
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Deltoid: Triangular shaped
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Trapezius: Trapezoid shaped
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Serratus: Saw-toothed muscle edge
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Rhomboideus: Diamond shaped
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Orbicularis: Circular shaped
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Pectinate: Comblike shaped
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Platys: Flat muscle
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Quadratus: Square shaped
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Gracilis: Slender muscle
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Characteristics Used to Name Muscles
Action of Muscles Flexor: Decreases angle at joint Extensor: Increases angle at joint Abductor: Moves bone away from midline Adductor: Moves bone toward midline Levator: Produces superior movement Depressor: Produces inferior movement Supinator: Turns palm anteriorly Pronator: Turns palm posteriorly Sphincter: Decreases size of opening Tensor: Makes a body part rigid Rotator: Moves bone around an axis
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Flexor: Decreases angle at joint
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Extensor: Increases angle at joint
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Adductor: Moves bone toward midline
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Levator: Produces superior movement
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Depressor: Produces inferior movement
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Supinator: Turns palm anteriorly
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Pronator: Turns palm posteriorly
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Sphincter: Decreases size of opening
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Tensor: Makes a body part rigid
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Characteristics Used to Name Muscles
Number of Origins of Muscle Biceps: Muscle with two origins Triceps: Muscle with three origins Quadriceps: Muscle with four origins
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Biceps: Muscle with two origins
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Triceps: Muscle with three origins
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Quadriceps: Muscle with four origins
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Location of Muscle
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Origin and Insertion of Muscle
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Origin and Insertion of Muscle
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Extrinsic Muscles of the Eye
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Extrinsic Muscles of the Eye
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