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Flashcards in Intrinsic Back Muscles Deck (19):
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Common origins of Splenius Capitis and Cervicis

1. Nuchal ligament
2. Spinous process of C7-T6

1

Insertion of the Splenius Capitis

1. Superolaterally to the mastoid process of the temporal bone
2. Lateral 1/3 of the superior nuchal line of the occipital bone

2

Insertion of the Splenius Cervicis

Tubercles of transverse processes of C1-C3 or C4 vertebrae

3

Innervation of the Splenius Capitis

Posterior rami of spinal nerves

4

Main action of Splenius when acting alone

Laterally flex neck and rotate head ipsilaterally

5

Main action of Splenius when acting together

Extend head and neck

6

Origin of Semispinalis (Capitis, Cervicis, and Thoracis)

Transverse processes of C4-T10

7

Insertion of the Semispinalis (Capitis, Cervicis, Thoracis)

1. Occipital bone
2. Spinous processes of the upper thoracic and cervical region spanning 4-6 segments

8

Nerve supply of Semispinalis (Capitis, Cervicis, and Thoracis)

Posterior rami of spinal nerves

9

Main actions of Semispinalis (Capitis, Cervicis, and Thoracis)

Extends head, thoracic, and cervical regions of the vertebral column and rotates them contralaterally

10

Origin of the Multifidus

1. Posterior sacrum
2. Posterior Superior Iliac Spine of ilium
3. Aponeurosis of erector spinae
4. Sacro-iliac ligaments
5. Mammillary processes of lumbar vertebrae
6. Transverse processes of thoracic vertebrae
7. Articular Processes of C4-C7

11

Insertion of the Multifidus

1. Thickest in the lumbar region
2. Entire length of spinous processes 2-4 segments superior to the origin

12

Nerve supply of the Multifidus

Posterior spinal rami of spinal nerves

13

Main actions of the Multifidus

1. Unilateral contraction rotates to contralateral side
2. Stabilizes vertebrae during local movements of vertebral column

14

Common origin of Rotatores (Longus and Brevis)

Transverse processes of vertebrae

15

Insertion of Rotatore Brevis

Junction of lamina and transverse process or spinous process immediately to vertebrae of origin

16

Insertion of Rotatore Longus

Junction of lamina and transverse process or spinous process 2 segments superior to vertebra of origin

17

Nerve supply of Rotatores (Longus and Brevis)

Posterior rami of spinal nerves

18

Main action of Rotatores (Longus and Brevis)

1. Functions as organs of proprioception
2. Stabilize vertebrae
3. Assist with local extension
4. Rotatory movements of vertebral column