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Gross Lect. Midterm > Intrinsic Muscles Of Back > Flashcards

Intrinsic Muscles Of Back Flashcards

1
Q

Epaxial Muscles

A

Intrinsic Muscles

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2
Q

What is the intrinsic muscles innervated by?

A

Dorsal Rami of spinal nerves

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3
Q

What 2 muscles make up the superficial intrinsic muscle group?

A

Splenius Capitis and cervicis

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4
Q

what 3 muscles make up the intermediate layer of intrinsic muscles?

A

Errector spinae - Iliocostal, longissimus, and spinalis

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5
Q

What muscles make up the deep layer of intrinsic muscles?

A

Transversespinalis

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6
Q

What muscles make up the transversospinalis?

A
  • Semispinalis, multifidus, and rotatores
  • Deep segmental muscles: interspinales, intertransversarii, and levatores costarum
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7
Q

What arteries supply the upper cervial region?

A

Occipital a. And Deep Cervical a.

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8
Q

What artery supplies the thoracic region?

A

Posterior intercostal a.a

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9
Q

What artery supplies the lumbar region?

A

Lumbar a.a

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10
Q

Origin of Splenius Capitis

A
  • Caudal half of ligamentum nuchae
  • S.P of C7-T3/4
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11
Q

Insertion of Splenius capitis

A
  • Mastoid Process
  • occipital bone inferior to lateral 1/3 of superior nuchal line
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12
Q

Actions of Splenius capitis

A
  • Unilateral: ipsilateral rotation of the head
  • Bilateral: extends head
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13
Q

Innervation of Splenius capitis

A

Upper cervical dorsal rami (C2,C3)

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14
Q

Blood supply of Splenius capitis

A
  • Transverse cervical a.
  • occipital a.
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15
Q

Origin of Splenius cervicis

A

S.p. of T3-T6

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16
Q

Insertion of Splenius cervicis

A

Posterior tubercles of T.P of C1-C3

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17
Q

Actions of Splenius cervicis

A
  • unilateral: ipsilateral rotates upper cervical vertebrae
  • bilateral: extends upper cervical spine
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18
Q

Innervation of Splenius cervicis

A

Lower cervical dorsal rami

19
Q

Blood supply of Splenius cervicis

A
  • occipital a.
  • transverse cervical a
20
Q

Erector Spinae Muscles include:

A
  1. Iliocostalis
  2. Longissimus
  3. Spinalis
21
Q

Most lateral erector spinae muscle:

A

Iliocostalis

22
Q

3 divisions of Iliocostalis:

A
  1. Lumborum
  2. Thoracis
  3. Cervicis
23
Q

Iliocostalis Lumborum origin

A
  • iliac crest
  • Thoracolumbar fascia
24
Q

Iliocostalis Lumborum insertion

A

Ribs 8-9, lateral to angle

25
Q

Iliocostalis Lumborum action

A
  • extension and lateral flexion of the vert column
26
Q

Iliocostalis Lumborum Innervation

A

Dorsal rami of lumbar nerves

27
Q

Blood supply of Iliocostalis Lumborum

A
  • Lumbar a.a
  • posterior intercostal a.a
28
Q

Origin of Iliocostalis thoracis

A

Lower 6 ribs, medial to Iliocostalis lumborum

29
Q

Insertion of Iliocostalis thoracis

A
  • Upper 6 ribs
  • T.P of C7
30
Q

Innervation of Iliocostalis thoracis

A

Dorsal rami of thoracic nerves

31
Q

Action of Iliocostalis thoracis

A
  • extension of the vertebral column
32
Q

Blood supply of the Iliocostalis thoracis

A

Posterior intercostal a.a

33
Q

Origin of Iliocostalis cervicis

A

Upper 3-6 ribs @ the angle

34
Q

Insertion of Iliocostalis cervicis

A

T.P of C4-C6

35
Q

Actions of Iliocostalis Cervicis

A

Extension and lateral flexion of the vert column

36
Q

Innervation of the Iliocostalis cervicis

A

Dorsal rami of C4-C6

37
Q

Blood supply of Iliocostalis cervicis

A

Posterior intercostal a.a

38
Q

Erector Spinae muscle that is thickest and medial to Iliocostalis

A

Longissimus

39
Q

3 divisions of longissimus

A
  1. Thoracis
  2. Cervicis
  3. Capitis
40
Q

Origin of Longissimus thoracis

A
  • thoracolumbar fascia
  • Accessory and T.Ps of the lumbar vertebrae
41
Q

Insertion of longissimus thoracis

A
  • lower 9 ribs
  • lower 9 T.P of thoracic vert (T4-T12)
42
Q

Action of longissimus thoracis

A

Extension and lateral flexion of the vert column

43
Q

Innervation of longissimus thoracis

A

Dorsal rami of the thoracic s.n

44
Q

Blood supply of longissimus thoracis

A
  • post intercostal a.a
  • lumbar a.a

Gross Lect. Midterm (2 decks)

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