Intrinsic Back Muscles

Question 0

Insertion of Splenius capitis

Answer 0

Mastoid process of temporal bone

Lateral third of superior nuchal line of occipital

Question 1

Origin of Splenius

Answer 1

Nuchal ligament

Spinous process of C7-T6

Question 2

Insertion of Splenius cervicis

Answer 2

Tubercles of transverse process of C1-C3 or C4

Question 3

Innervation of splenius

Answer 3

Posterior rami of spinal nerves

Question 4

Action of splenius

Answer 4

Alone: Laterally flex neck and rotate head to side of acting muscles
Together: Extend head and neck

Question 5

Origin of Erector Spinae

Answer 5

Iliac crest (Posterior)
Posterior surface of sacrum
Sacro-iliac ligaments
Sacral and inferior lumbar spinous processes
Supraspinous ligament

Question 6

Insertion of Iliocostalis

Answer 6

(Loumborum, thoracis, and cervicis)
Lower ribs
Cervical transverse process

Question 7

Insertion of Longissimus

Answer 7

(Thoracis, cervicis, and capitus)
Ribs between tubercles
Angles to transverse processes in thoracic and cervical regions
Mastoid process of temporal bone

Question 8

Insertion of Spinalis

Answer 8

(Thoracis, cervicis, and capitis)

Spinous process in upper thoracic region and to cranium

Question 9

Innervation of Erector spinae

Answer 9

Posterior rami of spinal nerves

Question 10

Action of Erector spinae

Answer 10

Acting bilaterally: extend vertebral column and head: as back is flexed, control movement by gradually lengthening their fibers
Acting unilaterally: Laterally flex vertebral column

Question 11

Origin of Semispinalis

Answer 11

Transverse processes of C4 - T10

Question 12

Insertion of Semispinalis

Answer 12

Occipital bone

Spinous process in upper thoracic and cervical regions runs superomedially

Question 13

Innervation of Semispinalis

Answer 13

Posterior rami of spinal nerves

Question 14

Action of Semispinalis

Answer 14

Extends head, thoracic, and cervical regions

Rotates these columns contralaterally