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Bio& 241 A&P 1 Unit 3 / Lecture 1

Bio& 241 A&P 1 Unit 3 / Lecture 1. 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. Origin and Insertion.

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Bio& 241 A&P 1 Unit 3 / Lecture 1

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  1. Bio& 241 A&P 1 Unit 3 / Lecture 1

  2. 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.

  3. Origin and Insertion

  4. Belly

  5. 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

  6. Characteristics Used to Name Muscles • Direction of Muscle Fibers • Rectus: Parallel to midline • Transverse: Perpendicular to midline • Oblique: Diagonal to midline

  7. Rectus: Parallel to midline

  8. Transverse: Perpendicular to midline

  9. Oblique: Diagonal to midline

  10. 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

  11. Maximus: Largest muscle in a group

  12. Minimus: Smallest muscle in a group

  13. Longus: Longest muscle in a group

  14. Brevis: Shortest muscle in a group

  15. Latissimus: Widest muscle in a group

  16. Major: Largest muscle in a group

  17. Minor: Smallest muscle in a group

  18. Vastus: Great or large muscle

  19. 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

  20. Deltoid: Triangular shaped

  21. Trapezius: Trapezoid shaped

  22. Serratus: Saw-toothed muscle edge

  23. Rhomboideus: Diamond shaped

  24. Orbicularis: Circular shaped

  25. Pectinate: Comblike shaped

  26. Platys: Flat muscle

  27. Quadratus: Square shaped

  28. Gracilis: Slender muscle

  29. 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

  30. Flexor: Decreases angle at joint

  31. Extensor: Increases angle at joint

  32. Adductor: Moves bone toward midline

  33. Levator: Produces superior movement

  34. Depressor: Produces inferior movement

  35. Supinator: Turns palm anteriorly

  36. Pronator: Turns palm posteriorly

  37. Sphincter: Decreases size of opening

  38. Tensor: Makes a body part rigid

  39. 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

  40. Biceps: Muscle with two origins

  41. Triceps: Muscle with three origins

  42. Quadriceps: Muscle with four origins

  43. Location of Muscle

  44. Origin and Insertion of Muscle

  45. Origin and Insertion of Muscle

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