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Anatomy Exam 2 > L15: Deep Back Muscles > Flashcards

L15: Deep Back Muscles Flashcards

1
Q

epaxial muscles

A

more dorsal

innervated by dorsal rami of spinal nerves

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2
Q

hypaxial muscles

A

more ventral

innervated by ventral rami of spinal nerves

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3
Q

3 groups of back muscle arrangement

A

superficial
intermediate
deep

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4
Q

superficial back muscles

A

–extrinsic
connect limb to axial skeleton

innervated by ventral rami or CN XI

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5
Q

examples of superficial back muscles

A
  1. trapezius
  2. lats
  3. levator scapulae
  4. rhomboids
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6
Q

intermediate back muscles

A

–extrinsic
respiratory muscles

innervated by ventral rami

ex. serratus posterior group

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7
Q

deep back muscles

A

–intrinsic
true intrinsic back muscles innervated by dorsal rami

3 groups of deep muscles sup. inter. deep

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8
Q

superficial deep back muscles

A

splenius capitis

splenius cervicis

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9
Q

intermediate deep back muscles

A

iliocostalis
longissimus
spinalis

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10
Q

deep-deep back muscles

A

semispinalis
multifidus
rotatores

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11
Q

muscles in thoracic area are interrupted by ?

A

ribs

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12
Q

example of deep back muscle groups

A
  • -spinotransversalis
  • -erector spinae complex
  • -transversospinalis group
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13
Q

thoracolumbar fascia

A

triangular-shaped sheet of tough CT

covers lower back

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14
Q

thoracolumbar fascia is a partial site of origin for ?

A

lats and abdominal oblique muscles

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15
Q

thoracolumbar fascia: attachments of posterior, middle, and anterior lamina

A

post - lumbar spinous processes

mid - lumbar transverse processes

ant - lumbar transverse processes

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16
Q

which thoracolumbar fascia lamina is the deepest?

A

anterior lamina

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17
Q

serratus posterior is divided into _____ parts: and named ?

A

2 parts

superior and inferior

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18
Q

serratus posterior superior: origin/insertion

A

ligamentum nuchae
spinous process of C7 - T1

ribs 2-5

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19
Q

serratus posterior superior and inferior actions

A

s - elevate upper ribs during inspiration

I - pull lower ribs inferiorly and counteract diaphragm

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20
Q

serratus posterior inferior: origin/insertion

A

spinous process of T11-12,L1

ribs 10-12

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21
Q

serratus posterior innervation

A

ventral rami of intercostals

22
Q

categorize the 3 types of back muscles as extrinsic or intrinsic

A

superficial and intermediate are extrinsic

deep muscles are the only true intrinsic muscles

23
Q

superficial intrinsic back muscles make up the ______ system

A

spinotransversalis system

24
Q

spinotransversalis system factors

A
  • -muscles run laterally and upward
  • -attach to transverse processes and skull
  • –has 2 parts
25
Q

spinotransversalis system muscles

A

splenius capitis

splenius cervicis

26
Q

intermediate intrinsic back muscles make up the _______ system

A

sacrospinalis system

27
Q

sacrospinalis system factors

A
  • –collectively forms erector spinae group
  • -run longitudinal and upward
  • -attach to transverse processes, ribs and spinous processes
  • –3 parts
28
Q

sacrospinalis system muscles

A
  1. iliocostalis
  2. longissimus
  3. spinalis
29
Q

deep intrinsic back muscles make up the _______ system

A

transversospinalis system

30
Q

transversospinalis system factors

A
  • -covered by sacrospinalis group
  • -run laterally and insert medially
  • -from transverse process to transverse process
  • -3 parts
31
Q

transversospinalis system muscles

A
  1. semispinalis
  2. multifidus
  3. rotatores
32
Q

cutaneous innervation of back is broken down into two sections

A

along the midline

laterally

33
Q

cutaneous innervation along the midline of the back

A

dorsal (posterior) rami of thoracic spinal nerves

34
Q

cutaneous innervation along lateral back

A

lateral cutaneous branches of intercostal nerves

35
Q

all true intrinsic muscles of the back are innervated by ?

A

dorsal rami

36
Q

what are the 3 groups of intrinsic back muscles?

A
  1. superficial or spinotransversalis
  2. intermediate or sacrospinalis or erector spinae
  3. deep or transversospinalis
37
Q

splenius capitis - origin/insertion

A

spinous process C7-T1-4

superior nuchal line and mastoid

38
Q

splenius cervices - origin/insertion

A

spinous process T3-6

C1-4 transverse processes (w/ levator scapula)

39
Q

iliocostalis - special arrangement

A

runs most lateral of sacrospinalis system

goes around and runs on both sides of ribs

40
Q

iliocostalis components, origin, insertion, action

A

lumborum, thoracis, cervices

ilium and sacrum

most ribs

extends back, keeps erect posture

41
Q

longissimus - location

A

middle portion of erector spinae

42
Q

longissimus components, origin, insertion

A

thoracis, cervices, capitis

transverse processes and sacrum

most ribs

43
Q

spinalis components, origin, insertion

A

thoracis, cervices, capitis

spinous processes of T11-12

spinous processes of thoracic and lower cervical vertebrae

44
Q

spinalis location

A

most medial erector spinae

45
Q

semispinalis components, origin, insertion

A

thoracis, cervices, capitis

C4-T6

cervical vertebrae and between sup/inf. nuchal lines

46
Q

multifundus origin, insertion

A

from sacrum, transverse processes up to C4

spinous processes of all vertebrae passes

traverses 3 segments

47
Q

rotatores is covered by ?

A

multifundus

48
Q

rotatores orientation

A

pass from root of transverse process to root of superior spinous process above

either long or short

49
Q

rotatores long and short

A

long - span two segments

short - span one segment

50
Q

intrinsic segmental deep back muscles

A
  1. interspinales

2. intertransversarii

Anatomy Exam 2 (9 decks)

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