A&P exam 3 (part 3)

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  1. 4 major muscle groups?
    • gut
    • trunk
    • limb
    • branchial
  2. gut muscles are derived from?
    splanchnic mesoderm
  3. splanchnic mesoderm gets
    smooth muscle embedded in wall of gut
  4. 2 layers of gut muscles?
    • inner circular layer
    • outer longitudinal layer
  5. trunk muscles come from?
    somitic mesoderm
  6. trunk muscles are?
  7. get striated muscles from
    myotomes which are trunk layers
  8. 2 major divisions of trunk muscles?
    • dorsal epaxial muscle mass
    • ventral hypaxial muscle mass
  9. extensors of trunk muscle are derived from here? also split into 2 parts?
    • dorsal epaxial muscle mass
    • medial and lateral
  10. flexors of trunk muscles are derived from here? 2 parts?
    • ventral hypaxial muscle mass
    • dorsal and ventral
  11. deep, short muscles of the back and have more individual vertebrae
    medial part of dorsal extensors
  12. gives rise to long muscles of the back and extend the entire length of vertebral column
    lateral part of dorsal extensors
  13. flex vertebral column, bending it laterally from side to side
    dorsal part of hypaxial muscles
  14. thoracic region
    ventral part
  15. 2 sheets of muscles that run in opposite directions of one another
    thoracic muscles
  16. thoracic muscles affect?
    internal intercostals and external intercostals
  17. ventral part of hypaxial muscles?
    moves ribs during breathing
  18. when muscles contract what happens to the rib cage ?
    elevate the rib cage
  19. brings air into the lungs
    external intercostals
  20. depressed ribcage, decreasing volume and squeeze out air
    internal intercostals
  21. have strong muscular wall made up of sheets of muscle (multiple layers)
    abdominal muscles
  22. what is named for location and fiber direction?
    obliques and transverse abdominis
  23. outermost sheet, fibers run at 45 degree angle tobody
    external oblique
  24. fibers run in opposite direction of ___ oblique, below
    • external
  25. runs across section of axis of body
    transversus abdominis
  26. when abdominal muscles contract what happens?
    they increase abdominal pressure
  27. changes routinely throughout the day
    abdominal pressure
  28. when does abdominal pressure go up?
    sneezing, deprication, urination, vomiting, and forced experation
  29. runs along latitudinal axis of body
    rectus abdominis
  30. long, straight muscle
  31. rectus abdominis attaches?
    pelvic girdle and rib cage
  32. the rectus abdominus ____ distance between ribcage and pelvic girdle when it contracts
  33. main function of rectus abdominis?
    flexes the trunk when ribcage moves closer
  34. move eyeball in socket
    extrinsic eye muscles
  35. 6 muscles of eye?
    • lateral, medial, superior and inferior rectus
    • superior and inferior oblique
  36. located outside of tongue
    extrinsic tongue muscles
  37. pulls tongue back and down
  38. pulls tongue straight back
  39. pulls tongue forward towards chin
  40. extrinsic tongue muscles?
    • hyoglossus
    • styloglossus
    • genioglossus
  41. the extrinsic tongue muscles move ?
    tongue when they contract
  42. glossus
    • tongue
    • moveable part, insertion
  43. hyo
  44. stylo
    styloid process of temporal bone
  45. genio
  46. somitic so you get striated muscles
  47. 2 muscle masses of limb muscles?
    • dorsal muscle mass
    • ventral muscle mass
  48. gives rise to extensors in limb
    dorsal muscle mass
  49. gives rise to ventral flexors
    ventral muscle mass
  50. dorsal extensors? of limb in arm
    • triceps brachii
    • extensors in forearm
  51. muscles in upper part of arm move ____; muscles in forearm move ___
    • arm
    • wrist, etc.
  52. leg dorsal extensors of limb?
    • quadriceps femoris
    • extensors in lower leg
  53. extends lower leg
    quadriceps femoris
  54. dorsiflexes the foot
    extensors in lower leg
  55. ventral flexors limbs arm?
    • biceps brachii and brachialis
    • flexors in forearm
  56. flexes forarm
    biceps brachii and bracialis
  57. flex hand and fingers
    flexors in forearm
  58. ventral flexors limbs leg?
    • hamstrings
    • flexors in lower leg
  59. flexes lower leg
  60. plantar flexes the foot
    flexors in lower leg
  61. muscles that move entire leg are in?
    pelvic girdle
  62. girdles dorsal extensors?
    deltoids, gluteal muscles
  63. girdles ventral flexors?
    pectoral muscles, thigh adductors, leg
  64. potential problem with leg muscles?
    only within leg is there 180 degree rotation
  65. in fish, branchial muscles develop into
  66. throat
  67. separated by slits that fuse together
    branchial arches
  68. branchial arches go around
    developing gut tube
  69. in branchial muscles, ___ mesoderm goes to ___ muscle
    • splanchnic
    • striated
  70. only place in body where splanchnic gives rise to striated muscle
    branchial muscles
  71. muscles of throat develop?
    larynx and pharynx
  72. muscles that move the jaw?
    • masseter
    • temporalis
    • pterygoid
  73. muscles of throat develop?
    muscles of facial expression, sternocleidomastoid and trapezius
Card Set
A&P exam 3 (part 3)
Muscles: Gross Anatomy
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