Intrinsic Back Muscles

Question 0

Insertion of the Splenius Capitis

Answer 0

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

Question 1

Common origins of Splenius Capitis and Cervicis

Answer 1

1. Nuchal ligament

2. Spinous process of C7-T6

Question 2

Insertion of the Splenius Cervicis

Answer 2

Tubercles of transverse processes of C1-C3 or C4 vertebrae

Question 3

Innervation of the Splenius Capitis

Answer 3

Posterior rami of spinal nerves

Question 4

Main action of Splenius when acting alone

Answer 4

Laterally flex neck and rotate head ipsilaterally

Question 5

Main action of Splenius when acting together

Answer 5

Extend head and neck

Question 6

Origin of Semispinalis (Capitis, Cervicis, and Thoracis)

Answer 6

Transverse processes of C4-T10

Question 7

Insertion of the Semispinalis (Capitis, Cervicis, Thoracis)

Answer 7

1. Occipital bone

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

Question 8

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

Answer 8

Posterior rami of spinal nerves

Question 9

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

Answer 9

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

Question 10

Origin of the Multifidus

Answer 10

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

Question 11

Insertion of the Multifidus

Answer 11

1. Thickest in the lumbar region

2. Entire length of spinous processes 2-4 segments superior to the origin

Question 12

Nerve supply of the Multifidus

Answer 12

Posterior spinal rami of spinal nerves

Question 13

Main actions of the Multifidus

Answer 13

1. Unilateral contraction rotates to contralateral side

2. Stabilizes vertebrae during local movements of vertebral column

Question 14

Common origin of Rotatores (Longus and Brevis)

Answer 14

Transverse processes of vertebrae

Question 15

Insertion of Rotatore Brevis

Answer 15

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

Question 16

Insertion of Rotatore Longus

Answer 16

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

Question 17

Nerve supply of Rotatores (Longus and Brevis)

Answer 17

Posterior rami of spinal nerves

Question 18

Main action of Rotatores (Longus and Brevis)

Answer 18

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