Anatomy Muscles Flashcards

1. Origins and Insertions Intended for entry level anatomy students Anatomy Muscles Flashcards

2. Origins and Insertions Anatomy Muscles Flashcards Intended to be viewed as full-screen…. select full-screen, and use “Page Down” to scroll through individual “flashcards” !

3. Origins and Insertions Anatomy Muscles Flashcards Note: Learn origins and insertions of each muscle well. This is why the bony landmarks are so important. Do not memorize the function of muscles ! Muscles contract only linearly. Thus, to know the origin and insertion of a muscle is to know the function.

4. Origins and Insertions Anatomy Muscles Flashcards Note: Every muscle has a multitude of actions. Listed are the primary actions of each muscle !

5. Origins and Insertions Presented in Three Parts: I – Muscles of Face, head, neck, thorax, and abdomen II – Muscles of the upper extremity III – Muscles of the lower extremity Anatomy Muscles Flashcards

6. Origins and Insertions Anatomy Muscles Flashcards Each card is a set of three: The first asks to identify the muscle. The next provides the clues. The third gives the name of the muscle.

7. 1. Identify this muscle and its action !

8. 1. Identify this muscle and its action ! Orbicularis Oculi • Origin: margin of the orbit • Insertion: eyelid & skin of face • Action: closes eye, blink • Innervation: Facial nerve (CN VII)‏

9. 2. Identify this muscle and its action !

10. 2. Identify this muscle and its action ! Orbicularis oris • Origin: Maxilla and mandible • Insertion: Fibers of the lips • Action: Compresses lips • Innervation: Facial nerve (CN VII)‏

11. 3. Identify this muscle and its action !

12. 3. Identify this muscle and its action ! • Origin: Zygomatic bone • Insertion: mandible • Action: Elevates mandible, closes jaws, chewing (“mastication”)‏ • Innervation: Mandibular branch of trigeminal nerve (CN V3)‏

13. 3. Identify this muscle and its action ! Masseter • Origin: Zygomatic bone • Insertion: mandible • Action: Elevates mandible, closes jaws, chewing (“mastication”)‏ • Innervation: Mandibular branch of trigeminal nerve (CN V3)‏

14. 4. Identify this muscle and its action !

15. 4. Identify this muscle and its action ! • Origin: manubrium and clavicle • Insertion: Mastoid process of temporal bone • Action: Flexes head at neck (both right and left muscles working together), or bends neck toward shoulder and turns face away (one-side only)‏ • Innervation: Spinal Accessory nerve (CN XI)‏

16. 4. Identify this muscle and its action ! Sternocleidomastoid • Origin: manubrium and clavicle • Insertion: Mastoid process of temporal bone • Action: Flexes head at neck (both right and left muscles working together), or bends neck toward shoulder and turns face away (one-side only)‏ • Innervation: Spinal Accessory nerve (CN XI)‏

17. 5. Identify this muscle and its action !

18. 5. Identify this muscle and its action ! • Origin: Inferior clavicle and fascia of chest • Insertion: Inferior surface of mandible • Action: Draws corners of mouth inferiorly and tenses skin of the neck by drawing it superiorly • Innervation: Cervical Branch of Facial Nerve (CN VII)‏

19. 5. Identify this muscle and its action ! Platysma • Origin: Inferior clavicle and fascia of chest • Insertion: Inferior surface of mandible • Action: Draws corners of mouth inferiorly and tenses skin of the neck by drawing it superiorly • Innervation: Cervical Branch of Facial Nerve (CN VII)‏

20. 6. Identify this muscle and its action !

21. 6. Identify this muscle and its action ! • Origin: Inferior border of rib • Insertion: Superior border of inferior rib • Action: Elevates ribs • Innervation: Intercostal nerves

22. 6. Identify this muscle and its action ! External Intercostals • Origin: Inferior border of rib • Insertion: Superior border of inferior rib • Action: Elevates ribs • Innervation: Intercostal nerves • Hint: External intercostals run in the same direction as your fingers when you put your hands in your pockets

23. 7. Identify this muscle and its action !

24. 7. Identify this muscle and its action ! • Origin: Superior border of inferior rib • Insertion: Inferior border of superior rib • Action: Depresses ribs • Innervation: Intercostal nerves

25. 7. Identify this muscle and its action ! Internal Intercostals • Origin: Superior border of inferior rib • Insertion: Inferior border of superior rib • Action: Depresses ribs • Innervation: Intercostal nerves • Hint: Internal intercostals run in the direction that your fingers run when you place your hands on your heart (i.e. deep and perpendicular to external intercostal muscles)‏

26. 8. Identify this muscle and its action ! • Origin: originates on the inferior border of the rib cage • Insertion: inserts on the central tendon. • Action: Flattens when it contracts to increase area of thorax and inflate lungs. • Innervation: Phrenic nerve (C3,4,5)

27. 8. Identify this muscle and its action ! Respiratory Diaphragm Origin: originates on the inferior border of the rib cage Insertion: inserts on the central tendon. Action: Flattens when it contracts to increase area of thorax and inflate lungs. Innervation: Phrenic nerve (C3,4,5)

28. 9. Identify this muscle and its action !

29. 9. Identify this muscle and its action ! • Origin: External, inferior borders of ribs • Insertion: linea alba and iliac crest • Action: Flex trunk (spine) at hip, compress abdomen • Innervation: Intercostal nerves • Note that the muscle fibers run in the direction that your fingers run when you put your hands in your pockets.

30. 9. Identify this muscle and its action ! External Oblique Abdominus • Origin: External, inferior borders of ribs • Insertion: linea alba and iliac crest • Action: Flex trunk (spine) at hip, compress abdomen • Innervation: Intercostal nerves • Note that the muscle fibers run in the direction that your fingers run when you put your hands in your pockets.

31. 10. Identify this muscle and its action !

32. 10. Identify this muscle and its action ! • Origin: Pubis • Insertion: costal cartilages and xiphoid process • Action: Flex trunk (spine) at hip, compress abdomen • Innervation: Intercostal nerves

33. 10. Identify this muscle and its action ! Rectus abdominus • Origin: Pubis • Insertion: costal cartilages and xiphoid process • Action: Flex trunk (spine) at hip, compress abdomen • Innervation: Intercostal nerves

34. Origins and Insertions Presented in Three Parts: I – Muscles of Face, head, neck, thorax, and abdomen II – Muscles of the upper extremity III – Muscles of the lower extremity Anatomy Muscles Flashcards

35. 11. Identify this muscle and its action !

36. 11. Identify this muscle and its action ! • Origin: Occipital bone and spinous processes of thoracic vertebrae • Insertion: Clavicle and scapula • Action: elevation of scapulae • Innervation: Spinal Accessory nerve (CN XI)‏

37. 11. Identify this muscle and its action ! Trapezius • Origin: Occipital bone and spinous processes of thoracic vertebrae • Insertion: Clavicle and scapula • Action: elevation of scapulae • Innervation: Spinal Accessory nerve (CN XI)‏

38. 12. Identify this muscle and its action !

39. 12. Identify this muscle and its action ! • Origin: vertebral spinous processes, iliac crest, and ribs • Insertion: Intertubercular groove and lesser tubercle (humerus • (common insertion with teres major muscle). • Action: Adduction of arm at shoulder • Innervation: spinal nerves (C6-C8)‏

40. 12. Identify this muscle and its action ! Latissimus dorsi • Origin: vertebral spinous processes, iliac crest, and ribs • Insertion: Intertubercular groove and lesser tubercle of humerus • (common insertion with teres major muscle). • Action: Adduction of arm at shoulder • Innervation: spinal nerves (C6-C8)‏

41. I Anterior view 13. Identify this muscle and its action !

42. I Anterior view 13. Identify this muscle and its action ! • Origin: Subscapular fossa • Insertion: Lesser tubercle (humerus)‏ • Action: Medial rotation of shoulder • Innervation: spinal nerve from posterior cord of brachial plexus

43. I Anterior view 13. Identify this muscle and its action ! Subscapularis(1 of 4 rotator cuff muscles)‏ • Origin: Subscapular fossa • Insertion: Lesser tubercle (humerus)‏ • Action: Medial rotation of arm at shoulder • Innervation: spinal nerve from posterior cord of brachial plexus

44. posterior view Anterior view 14. Identify this muscle and its action !

45. posterior view Anterior view 14. Identify this muscle and its action ! • Origin: Supraspinous fossa • Insertion: Greater tubercle • Action: abduct arm at shoulder • Innervation: spinal nerve from brachial plexus

46. posterior view Anterior view 14. Identify this muscle and its action ! Supraspinatus(1 of 4 rotator cuff muscles)‏ • Origin: Supraspinous fossa • Insertion: Greater tubercle (humerus)‏ • Action: abduct arm at shoulder • Innervation: spinal nerve from brachial plexus

47. posterior view Anterior view 15. Identify this muscle and its action !

48. posterior view Anterior view 15. Identify this muscle and its action ! • Origin: Infraspinous fossa • Insertion: Greater tubercle (humerus)‏ • Action: Lateral rotation of arm at shoulder • Innervation: spinal nerve from brachial plexus

49. posterior view Anterior view 15. Identify this muscle and its action ! Infraspinatus(1 of 4 rotator cuff muscles)‏ • Origin: Infraspinous fossa • Insertion: Greater tubercle (humerus)‏ • Action: Lateral rotation of arm at shoulder • Innervation: spinal nerve from brachial plexus

50. posterior view 16. Identify this muscle and its action !