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Human Anatomy (DO 1) > Deep back > Flashcards

Deep back Flashcards

1
Q

Are the deep back muscles intrinsic or extrinsic (explain)

A
  • Intrinsic ( they originate and insert in the back )
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2
Q

What are the main muscle groups of the deep back

A
  1. ) Splenius (most superficial)
  2. ) Erector spinae (intermediate)
  3. ) Transversospinales (deepest)
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3
Q

MInor muscles of the deep back

A
  1. ) Interspinales
  2. ) Intertransversarii (might be innervated by medial dorsal nerve)
  3. ) levatores costarum
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4
Q

In general what actions do all deep back muscles perform

A

Extensors- extension of the spine/head (ALL)

CAN assist with…

  • lateral felxion (side bending) of VC or head/neck
  • smaller muscles are stabilizers and proprioceptors
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5
Q

Thoracolumbar facia and the deep back

A
  • deep fascia of the thorasic and lumbar regions
  • covers erector spinae muscle group
  • thicker in the lumbar region compared to throasic region
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6
Q

Thoracolumbar facia in the thoracic region

location, attachment

A
  • deep to the extrinsic (superficial back) muscles

- attaches to thoracic spinous processes and to the rib angles

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7
Q

Thoracolumbar facia in the lumbar region (location, attachment)

A
  • thicker (three layers)

- fuses laterally with aponeuroses of lateral abdominal muscles and superficial back muscles

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8
Q

Posterior Thoracolumbar facia attachment

A
  • lumbar spinious processes
  • median sacral crest
  • superior illium
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9
Q

Middle Thoracolumbar facia attachment

A
  • lumbar transverse processes
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10
Q

Anterior Thorocolumbar facia attachment

A
  • lumbar transverse processes
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11
Q

Muscles in the Spinotransversales group

A
  • Splenius Capitus

- Splenius Cervicis

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12
Q

Splenius capitus (location, O and I)

A
  • deep to the trapezius
  • fibers run superolaterally (perpendicular) to upper trap fibers
- Origin: 
    Inferior half of ligamentum nuchae 
    spinous processes (C7-T4) 
- Insertion: 
    Mastoid process 
    lateral 1/3 of superior nuchal line 
-
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13
Q

Splenius capitus action

A
  • unilateral: lateral flexion (side bend)
    Ipsilateral rot. head and neck
  • Bilateral: extend head and neck
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14
Q

Splenius cervicis (location, O and I)

A
  • separates from splenius capitus around T3 area
  • Orientation: spinous processes (T3-T6)
  • Insertion : posterior tubercles of the transverse processes of C1-C4
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15
Q

Splenius cervicic action

A
  • unilateral: lateral flex (side bend)
    ipsilateral rot. neck
    -bilateral: extension
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16
Q

Erector Spinae muscles

A
  1. ) Illiocostalis
  2. ) Longissims
  3. ) Spinalis

all have common orientation in lower segments = thoracolumbar fascia

17
Q

Illiocostalis

A
  • most lateral

Origin thoracolumbar fascia

Insertion: Rib angles and cervical transverse processes (C4-C6)

18
Q

Illiocostalis action

A

Unilateral: Lateral flex (side bend)

Bilateral: Extension

19
Q

Longissimus (location, O and I)

A
  • medial to the illiocostalis
  • spans sacrum to skull

Origin: thoracodorsal lumbar
thorasic spinous processes

Insertion: medial to the rib angles
transverse processes (C and T)
mastoid process

20
Q

Longissimus action

A

Unilaterally: lateral flex (side bend)
Ipsilateral rot. head and neck
Bilateral: extends column

21
Q

Spinalis (location, O and I)

A
  • most medial
  • arches between spinous processes
  • arches across 6-10 vertebra

Origin/Insertion : attaches between spinous
processes ( O and I)
ligamentum nuchae (O)

22
Q

Spinalis action

A

Extend the vertebral column

23
Q

Transversopinalis muscle group

location, general O& I, and action

A
  • deep to the erector spinous group
  • fibers slant superomedially
General O: Mamillary processes (L) 
                    Transverse processes (T) 
                    Articular processes (C)

General I: Spinous process of more superior
vertebra

 Action: 
                Unilateral: lateral flexion (side 
                bending)
                Contralateral rotation 
                Stabilizers 
                Proprioceptors
24
Q

Muscles included in Transversospinalis muscle group

A
  1. ) Semispenalis
  2. ) Multifidus
  3. ) Rotatores
25
Q

Semispenalis (description and action)

A
  • spans half the spine
  • spans in 4-6 vertebral segments
  • divided into thoracis, cervicis, and capitis
  • Action:
    -Unilateral: thorasics/cervicis
    contralaterally rotate
    • Bilaterally- extend the vertebral column
26
Q

Multifundis

A
  • spans 2-4 vertebral segments
  • robust in the lumbar region (deep to
    erector spinae)
  • more superiorly it is deep to the
    semispenalis

Human Anatomy (DO 1) (13 decks)

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