Exam 1: Second Order- Hand

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Author:
brau2308
ID:
158938
Filename:
Exam 1: Second Order- Hand
Updated:
2012-06-15 21:05:39
Tags:
second order anatomy hand origin insertion action innervation muscles
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Description:
review of second order of the hand muscles for exam 1
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  1. Which muscles are part of the thenar muscles?
    • abductor pollicis brevis
    • flexor pollicis brevis
    • opponens pollicis  
  2. Thenar muscles
    Origin:
    flexor retinaculum and trapezium
  3. Thenar muscles
    Insertion:
    shaft (body) of 1st metacarpal
  4. Which thenar muscle has a different insertion?
    flexor pollicis brevis
  5. Flexor Pollicis Brevis (Thenar muscle -exception)
    Insertion:
    proximal phalanx of thumb
  6. Thenar muscles
    Action:
    abduct thumb, flex thumb, and rotates thumb into opposition, respectively
  7. Thenar muscles
    Innervation:
    recurrent branch of median N
  8. Which thenar musle has a different innervation?
    deep head of flexor pollicis brevis
  9. Flexor Pollicis Brevis (Thenar muscle exception)
    Deep head Innervation:
    ulnar N
  10. Adductor pollicis
    Transverse head Origin:
    shaft of 3rd metacarpal
  11. Adductor pollicis
    Oblique head Origin: 
    bases of 1st-3rd metacarpals
  12. Adductor pollicis
    Insertion:
    base of the proximal phalanx
  13. Adductor pollicis
    Action:  
    adduct thumb
  14. Adductor pollicis
    Innervation:
    ulnar N
  15. What are the hypothenar muscles?
    • palmaris brevis
    • abductor digiti minimi
    • flexor digiti minimi brevis
    • opponens digiti minimi   
  16. Hypothenar muscles
    Insertion:
    base of proximal phalanx of 5th digit
  17. Which hypothenar muscle has a different insertion?
    opponens digiti minimi
  18. Opponens digiti minimi (exception to hypothenar mm.)
    Insertion:
    shaft of 5th metacarpal
  19. Hypothenar muscles
    Innervation:
    deep branch of ulnar N
  20. Palmaris brevis
    Origin:
    flexor retinaculum and palmar aponeurosis
  21. Palmaris brevis (exception to hypothenar mm.)
    Innervation:
    ulnar N or its superficial branch
  22. Which hypothenar muscle has a different innervation?
    palmaris brevis
  23. Abductor digiti minimi
    Origin:
    pisiform bone
  24. Abductor digit minimi
    Action:
    abducts 5th digit; assists in flexion of proximal phalanx
  25. Flexor digiti minimi brevis
    Origin:
    flexor retinaculum and hook of hamate
  26. Flexor digit minimi brevis
    Action:
    flexes proximal phalanx of 5th digit
  27. Opponens digiti minimi
    Origin:
    flexor retinaculum and hook of hamate
  28. Opponens digiti minimi
    Action:
    draws 5th metacarpal anterior and rotates it, brings 5th digit into opposition with thumb
  29. Which hypothenar muscles share the same origin?
    • flexor digiti minimi brevis
    • opponens digiti minimi
  30. Interossei muscles
    Innervation:
    deep branch of ulnar N
  31. How many dorsal interossei muscles are there?
    4
  32. How many palmar interossei muscles are there?
    3
  33. Dorsal interossei
    Origin:
    adjacent sides of two metacarpals
  34. Dorsal interossei
    Insertion:
    bases of proximal phalanges; extensor expansions of 2nd-4th digits
  35. Dorsal interossei
    Action:
    abduct 2nd-4th digits from axial line; act with lumbricals inflexing metacarpophalangeal joints and extending interphalangeal joints
  36. Palmar interossei
    Origin:
    palmar surfaces of 2nd, 4th, and 5th metacarpals
  37. Palmar interossei
    Insertion:
    bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th digits
  38. Palmar interossei
    Action:
    adduct 2nd, 4th and 5th digits toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joint
  39. Lumbricales muscles
    Origin:
    flexor digitorum profundus tendons
  40. Lumbricales muscles
    Insertion:
    lateral sides of extensor expansions of 2nd-5th digits
  41. Lumbricales muscles
    Action:
    extend interphalangeal jonts, flex MP joints
  42. Lumbricales muscles
    Innervation: 
    • medial (3rd and 4th) - ulnar N
    • lateral (1st and 2nd) - median N 

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