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Gross Anatomy I NYCC > Extrinsic Back Muscles > Flashcards

Extrinsic Back Muscles Flashcards

1
Q

List the superficial muscles of the back

A

Trapezius
Latissimus Dorsi
Levator Scapulae
Rhomboideus Major
Rhomboideus Minor

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2
Q

Trapezius is superficial to:

A
  • splenius muscles of neck
  • lower fibers Levator scapulae
  • rhomboids
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3
Q

Origins of trapezius

A

External occipital protuberance
Medial 1/3 of superior nuchal line
Ligamentum nuchae
Spinous processes of C7- T12

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4
Q

Trapezius superior fibers insertion

A

Lateral 1/3 of clavicle

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5
Q

Trapezius middle fibers insertion

A

Spine and acromion of scapula

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6
Q

Trapezius inferior fibers insertion

A

Base of spine of scapula

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7
Q

Innervation of trapezius

A

CN XI accessory: motor
Ventral rami of C3 and C4 nerves: proprioception

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8
Q

Trapezius blood supply

A

superficial branch of transverse cervical artery

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9
Q

Trapezius actions on scapula

A

Raises, retracts, rotates scapula

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10
Q

Trapezius actions on head

A

Bilateral contraction of superior fibers extends head
Unilateral contraction of upper fibers laterally flexes head and cervical vertebrae

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11
Q

Trapezius superior fibers action on scapula

A

Elevate scapula, form force couple to rotate the scapula (upwards)

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12
Q

Trapezius middle fibers action

A

Retract the scapula

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13
Q

Trapezius inferior fibers action

A

Depress scapula

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14
Q

Latissimus dorsi origins

A

Spinous processes of T7-T12
All lumbar and sacral vertebrae (spinous processes)
Posterior part of iliac crest
From lower 3-4 ribs via muscular slips that interdigitate with external oblique muscle

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15
Q

Latissimus dorsi insertion

A

Crest of lesser tubercle, floor of bicipital groove of humerus

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16
Q

Latissimus dorsi innervation

A

Thoracodorsal nerve (posterior cord of brachial plexus, C6-C8 fibers)

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17
Q

Latissimus dorsi blood supply

A

Thoracodorsal artery (branch of subscapular artery)

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18
Q

Latissimus dorsi actions

A

Extension, medial rotation, adduction of arm

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19
Q

Levator scapulae origin

A

Posterior tubercles of transverse processes of C1- C3/4

20
Q

Levator scapulae insertion

A

Medial border of scapula from superior angle to base of spine

21
Q

Levator scapulae innervation

A

Ventral rami C3, C4 from deep branches of cervical plexus
Twig from dorsal scapular nerve (C5)

22
Q

Levator scapulae blood supply

A

Deep branch of transverse cervical artery

23
Q

Levator scapulae actions

A

Elevates and retracts scapula with trapezius
Laterally flexes cervical vertebral column when scapula is fixed

24
Q

Both r. major and r. minor lie deep to:

A

Trapezius

25
Q

Which Rhomboideus is more superior

A

Rhomboid minor

26
Q

Rhomboideus minor origins

A

Lower part of ligamentum nuchae
Spinous processes of C7 and T1

27
Q

Rhomboideus minor insertion

A

Medial border of scapula at base of spine

28
Q

Rhomboideus minor innervation

A

Dorsal scapular nerve (C4, C5)

29
Q

Rhomboideus minor blood supply

A

Deep branch of transverse cervical artery

30
Q

Rhomboideus minor actions

A

Elevates medial border of scapula
Retracts scapula
Rotation of scapula (downwards)

31
Q

Rhomboideus major origin

A

Spinous processes of T2- T5

32
Q

Rhomboideus major insertion

A

Medial border of scapula between base of spine and inferior angle

33
Q

Rhomboideus major innervation

A

Dorsal scapular nerve (C4, C5)

34
Q

Rhomboideus major blood supply

A

Deep branch of transverse cervical artery

35
Q

Rhomboideus major actions

A

Elevates medial border of scapula
Retracts scapula
Rotation of scapula (downwards)

36
Q

Serratus posterior superior origin

A

Lower end of ligamentum nuchae
SpInous processes of C7- T2/T3

37
Q

Serratus posterior superior insertion

A

Ribs 2-5 lateral to angle

38
Q

Serratus posterior superior innervation

A

First four intercostal nerves (ventral rami of first four thoracic nerves)

39
Q

Serratus posterior superior blood supply

A

Highest intercostal artery, posterior intercostal arteries

40
Q

Serratus posterior superior action

A

Elevates upper ribs during inspiration

41
Q

Serratus posterior inferior origin

A

Spinous processes of T10 – L2

42
Q

Serratus posterior inferior insertion

A

Lower 3-4 ribs lateral to angles

43
Q

Serratus posterior inferior innervation

A

Lowest 4 intercostal nerves (ventral rami of lower thoracic)

44
Q

Serratus posterior inferior blood supply

A

Posterior intercostal arteries

45
Q

Serratus posterior inferior action

A

Depresses lower ribs down and back during inspiration

Gross Anatomy I NYCC (15 decks)

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