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MSS - MSK Exam 1 > Muscles of the Back: Intermediate and Deep > Flashcards

Muscles of the Back: Intermediate and Deep Flashcards

1
Q

intermediate muscles of the back?

A

serratus posterior inferior and superior

involved in respiration

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2
Q

innervation of intermediate back muscles?

A

ventral primary rami of thoracic spinal nerves

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3
Q

innervation of deep back muscles?

A

dorsal rami of spinal nerves

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4
Q

attachments of serratus posterior superior?

A

Origin:
-nuchal ligament and spinous processes of CV7-TV3

Insertion:
Posterior Surface of Ribs 2-5 lateral to angle

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5
Q

action of serratus posterior superior?

A

elevates ribs during inspiration

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6
Q

innervation of serratus posterior superior?

A

intercostal nerves T1-T4

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7
Q

attachments of serratus posterior inferior?

A

Origin:
spinous processes of TV11 - LV2
-via thoracolumbar fascia

Insertion: Posterior surface of Ribs 9-12 lateral to angle (like the lat)

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8
Q

actions of the serratus posterior inferior?

A

depresses four lower ribs allowing diaphragm to act during inspiration

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9
Q

innervation of serratus posterior inferior?

A

intercostal nerves T9-T11 and subcostal nerve

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10
Q

fascia for deep back?

A

nuchal fascia - cervical
thoracolumbar fascia - thorax and lumbar

**continuous with one another

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11
Q

splenius capitis et cervicis?

A

same origin

different insertions

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12
Q

attachment of splenius capitis?

A

Origin:
spinous process of CV7 and TV6

Insertion:
lateral portion of superior nuchal line

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13
Q

attachment of splenuis cervicis?

A

Origin:
spinous process of CV7 and TV6

Insertion:
posterior tubercles of transverse processes CV1-CV3

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14
Q

action of splenius capitis?

A

extend head

rotate and side bend head to same side

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15
Q

action of splenius cervicis?

A

extends and rotates neck to same side

also binds deeper muscle

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16
Q

innervation of splenius capitis et cervicis?

A

dorsal rami of C2-C5

**dorsal primary rami

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17
Q

erector spinae?

A

deep to superficial and intermediate muscles of back
-occupies the vertebral costal groove

attaches inferiorly to aponeurotic tendon

iliocostalis, longissimus, and spinalis

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18
Q

aponeurosis

A

broad tendon

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19
Q

what happens as the erector spinae ascends?

A

separates into three muscles (ILS)

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20
Q

three segments of iliocostalis?

A

lumborum, thoracis, cervicis

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21
Q

three segments of longissimus?

A

thoracis, cervicis, capitis

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22
Q

three segments of spinalis?

A

thoracis, cervicis, and capitis

**capitis usually blended with semispinalis (95%)

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23
Q

major action of erector spinae?

A

no rotation (longissimus capitis only a little)

**only extension of the spine and sidebending

stabilizers

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24
Q

attachment of iliocostalis?

A

Origin:
crest of ilium and sacrum
posterior surface of ribs at angle

Insertion:
angle of ribs, transverse processes of lower CV

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25
Q

innervation of erector spinae?

A

dorsal rami of spinal nerves

26
Q

attachment of longissimus?

A

Origin:
transverse processes below

Insertion:
transverse processes above
**capitis portion - mastoid process deep to splenius and sternocleidomastoid

27
Q

transversospinae

A

rotate the spine

semispinalis, multifidus, rotatores

deep to the erector spinae

28
Q

attachment of transversospinae?

A

Origin:
transverse process below

Insertion:
Spinous process above

29
Q

action of transversospinae?

A

both sides acting - extent spine

one side acting - side bend same side and rotation opposite side

30
Q

where is the reference for vertebral rotation?

A

the anterior body

31
Q

divisions of semispinalis?

A

thoracis, cervicis, and capitis

each segment extends 4-6 vertebrae

32
Q

semispinalis thoracis?

A

continuous with the semispinalis cervicis

33
Q

semispinalis cervicis?

A

ends at spinous process of CV2

34
Q

semispinalis capitis?

A

largest muscle of posterior neck

35
Q

local adjustors?

A

proprioceptors send feedback to keep the vertebrae straight

36
Q

attachment of semispinalis capitis?

A

largest muscles of neck (posterior)

Origin:
mid-thoracic to lower cervical

Insertion:
-skull

superficial to semispinalis cervicis

37
Q

what group of erector spinae fuses with other muscle?

A

semispinalis capitis fuses with spinalis capitis

38
Q

attachment of multifidus?

A

sacrum to CV2

39
Q

multifudus segmental subdivision?

A

2-4 vertebrae

40
Q

action of multifidus

A

mainly an extensor, minimal rotatory component

mostly in lumbar

41
Q

attachment of rotatores?

A

same as multifidus

42
Q

first bifid spinous process?

43
Q

do lumbar vertebrae rotate?

A

not much

mainly extensor action of multifidus

44
Q

what has greatest move effect in transversospinae?

A

semispinalis

multifidus and rotatores are more involved in stabilization

45
Q

interspinales?

A

in between the spinous processes

46
Q

intertransversarii?

A

in between transverse processes

47
Q

function of intersegmental muscles?

A

stabilizers

48
Q

what is the role of intertransversarii?

A

local adjustors to maintain sidebending

49
Q

what is the role of interspinales?

A

local adjustor for extension of spine
-mainly cervical and lumbar

**thoracic has spinous processes that are very intimately associated

50
Q

intertransversarii in the thoracic region?

A

levator costarum

51
Q

levator costarum

A

transverse processes above to ribs (span 1-2 ribs)

52
Q

innervations of levator costarum?

A

ventral rami of spinal nerves

53
Q

suboccipital triangle?

A

located deep to the semispinalis capitis

extend skull and rotate skull and atlas to same side

54
Q

innervation of all suboccipital triangle muscles?

A

dorsal ramus of C1 (suboccipital)

55
Q

C1

A

suboccipital nerve

innervate the suboccipital triangle

56
Q

rectus capitus muscles?

A

rectus capitus posterior minor and major

57
Q

obliquus capitis muscles?

A

obliquus capitis inferior and superior

58
Q

rectus capitus posterior minor?

59
Q

rectus capitis posterior major?

60
Q

obliquus capitis inferior?

61
Q

obliquus capitis superior?

62
Q

what are the layers of muscle (all 6)

A

layer 1 - trapezius and latissimus dorsi
layer 2 - rhomboids and levator scapulae

layer 3 - serratus posteior superior and inferior

layer 4 - Erector Spinae & Splenius Capitis et Cervicis
layer 5 - Transversospinalis (Semispinalis, Multifidus, Rotatores)

layer 6 - Intersegmental Muscles (Interspinales, Intertransversarii)

MSS - MSK Exam 1 (11 decks)

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