Spine/Neck Muscles Flashcards Preview

Clinical Anatomy > Spine/Neck Muscles > Flashcards

Flashcards in Spine/Neck Muscles Deck (24):
1

Splenius Capitis
-Inf. attachment
-Sup. attachment
-Action
-Innervation

-Inf. attachment:

Nuchal ligament and spinous processes of C7–T6

 

-Sup. attachment:

•mastoid process of temporal bone and

•lateral 1/3 of superior nuchal line of occipital bone

 

-Action:

Unilateral: laterally flex neck & ipsilateral rotation

Bilateral: extend head and neck

 

-Innervation:

Dorsal (Posterior) rami of spinal nerves

 

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2

Splenius Cervicis

-Inf. attachment

-Sup. attachment

-Action

-Innervation

-Inf. attachment:

Spinous processes of C7–T6

 

-Sup. attachment:

•tubercles of transverse processes of C1– C4 vertebrae

 

-Action:

Unilateral: laterally flex neck & ipsilateral rotation

Bilateral: extend head and neck

 

-Innervation:

Dorsal (Posterior) rami of spinal nerves

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3

Erector spinae

-Origin

-Action

-Innervation

-Origin:

: broad tendon from
        • posterior part of iliac crest
        • posterior surface of sacrum
        • sacro-iliac ligaments
        • sacral and inferior lumbar spinous processes
        • supraspinous ligament

-Action:

  • -Acting bilaterally: extend vertebral column and head; as back is flexed, control movement via eccentric contraction
  • -Acting unilaterally: laterally flex vertebral column

-Innervation:

  • Dorsal (Posterior) rami of spinal nerves

 

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4

Iliocostalis insertion & parts

("lateral column")

   - lumborum, thoracis, cervicis;

           •angles of ribs

           •cervical transverse processes

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5

Longissimus insertion & parts

("intermediate column")

                            - thoracis, cervicis, capitis;

                                    •ribs between tubercles and angles to

                                    •transverse processes in thoracic and cervical regions

                                    •mastoid process of temporal bone

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6

Spinalis insertion & parts

("medial column")

                            - thoracis, cervicis, capitis;

                                    •spinous processes in the upper thoracic region 

                                    •cranium

 

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7

Transversospinalis

-Parts & segments

-Innervation

- Deepest group of intrinsic back muscles

- Postural muscles/ stabilize adjoining vertebrae & control movements during “global” motion of vertebral column

- capable of small amounts of extension and rotation

- Muscles run from transverse process to spinous process

 

Semispinalis (Thoracic, Cervicis, Capitis), Multifidus (Thoracic, Lumbar), Rotatores (best developed in thoracic)

Dorsal (Posterior) rami of spinal nerves

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8

Semispinalis Thoracis

Prox. attachment

Distal attachment

Segments

Action

Prox. attachment:

  • TP’s of C4-T12 vertebrae

Distal attachment:

  • Spinous process of above

Segments:

  • 4 to 6 segments

Action:

  • Contralateral Rotation of Thoracic and Cervical regions of vertebral column                                                           

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9

Semispinalis Cervicis & Capitis

Prox. attachment

Distal attachment

Segments

Action

Prox. attachment:

  • TP’s of T1-T6 vertebrae

Distal attachment:

  • Spinous process of above, Occipital bone

Segments:

  • 4 to 6 segments

Action:

  • Extends head, Cervical and Thoracic regions of vertebral column

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10

Multifidus- thoracic and lumbar regions

Prox. attachment

Distal attachment

Segments

Action

Prox. attachment:

  • articular processes of C4-C7 vertebrae

Distal attachment:

  • SP as high as C2

Segments:

  • 2 to 4 segments

Action:

  • stabilization of vertebrae during “local movements” of spine

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11

Rotatores

Prox. attachment

Distal attachment

Segments

Action

Prox. attachment:

  • superior border of transverse processes

Distal attachment:

  • superiorly to laminae above (junction of lamina and TP)

Segments:

  • 1 to 2 segments

Action:

  • stabilize vertebrae and assists with local extension and rotational movements of vertebral column

12

Quadratus lumborum

Prox. attachment

Distal attachment

Segments

Action

Origin: Medial half of inferior border of 12th ribs and tips of lumbar transverse processes

Insertion: Iliolumbar ligament and internal lip of iliac crest

Action: Extends and laterally flexes vertebral column; fixes 12th rib during inspiration

Inn: Anterior branches of T12 and L1–L4 nerves

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13

Rectus capitis posterior major

Prox. attachment

Distal attachment

Segments

Action

            Origin: Spinous process of C2 (axis)

            Insertion: Lateral part of inferior nuchal line of occipital bone

            Action: bilateral extend head, ipsilateral rotate

            Inner: suboccipital nerve

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14

Rectus capitis posterior minor

Prox. attachment

Distal attachment

Segments

Action

            Origin: Posterior tubercle vertebra C1 (atlas)

            Insertion: Medial part of inferior nuchal line of occipital bone

            Action: bilateral extend head, ipsilateral rotate

            Inner: suboccipital nerve

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15

Obliquus capitis superior

            Origin: Transverse process of vertebra C1

            Insertion: Occipital bone between superior and inferior nuchal lines

            Action: extend head, ipsilateral lateral flexion

            Inner: suboccipital nerve

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16

Obliquus capitis inferior

            Origin: spinous process of C2 (axis)

            Insertion: Transverse process of vertebra C1 (atlas)

            Action: contributes ipsilateral rotation of head

            Inner: suboccipital nerve

            *Although it has “capitus” in the name-->DOES NOT attach to the head!

            Forms the inferior border of the occipital triangle

17

Sternodeidomastoid

 -2 heads:

  • Sternal head: manubrium & sternum
  • Clavicular head: superior surface of medial third of clavicle

-attach:

  • mastoid process of temporal bone
  • lateral ½ of sup. Nuchal line

-Action:

  • extend head at AO joint (computer head, elevation of chin)
  • unilaterally, laterally flexes and contralaterally rotates
  • flexion with eccentric contraction
  • accessory respiratory muscle

-innervation:

CN XI,  Ant. Rami C2, C3 (sensory)

 

18

Longus Capitus

            Superior: basilar aspect of occipital bone (anterior to occipital condyle)

            Inferior: anterior tubercles of TP’s of C3-C6

            Action: flex head at AO Joint

            Innervation: anterior rami C1-C3

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19

Longus Colli

            Superior: anterior tubercle of C1, bodies of C1-C3 and TP’s of C3-C6

            Inferior: bodies of C5-T3

            Action: Neck flexion with rotation

                        -unilateral: some contralateral rotation

            Innervation: Anterior rami C2-C6

20

Rectus Capitus Anterior

            Superior: base of skull- anterior to occipital condyle

            Inferior: anterior surface of lateral mass of C1 TP

            Action: flexes head relative to AO Joint

            Innervation: branches of loop between C1 & C2

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21

Rectus Capitus Lateralis

            Superior: jugular process of occipital bone

            Inferior: TP of atlas

            Action: flexes head, lateral flexion, stabilization

            Innervation: branches of loop between C1 & C2

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22

Anterior Scalene

            Superior: TP’s of C3-C6

            Inferior: scalene tubercle of 1st rib

            Action: flexion, lateral flexion, elevation of 1st rib with deep inhalation

            Innervation: anterior rami C4-C6

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23

Middle Scalene

            Superior: TP’s of C5-C7

            Inferior: upper surface of 1st rib, posterior to groove for subclavian a.

            Action: lateral cervical flexion, elevation of 1st rib with forced inhalation

            Innervation: anterior rami of cervical spinal nerves

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24

Posterior Scalene

            Superior: posterior tubercle TP’s of C5-C7

            Inferior: ridge on upper 2nd rib

            Action: lateral neck flexion, elevation of 2nd rib with forced inhalation

            Innervation: anterior rami of cervical spinal nerves C7 & C8

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